Consulta: subjectFacets:"Stomata"
Registros recuperados: 33
Data/hora: 09/06/2024 05:20:38

Estomas en hojas y anatomía de xilema en tallo de lima Persa en diferentes portainjertos
Provedor de dados: 32
Autores: Berdeja Arbeu, Raúl.
En cítricos existen pocos trabajos en donde se estudia el efecto de los portainjertos en las características estomáticas  en hojas de lima 'Persa' y anatomía de xilema de los portainjertos y lima 'Persa' y su correlación con vigor de planta, por lo que se realizaron dos experimentos.  En el primero se estudió la combinación lima 'Persa' en 11 portainjertos cítricos (citranges 'C32', 'C35', 'Benton', 'Carrizo', 'Florida' y 'Morton', los mandarinos 'Amblicarpa' y 'Cleopatra', limón 'Volkameriano', 'Flying Dragon' y naranjo 'Agrio' como testigo), los portainjertos modificaron el número de estomas (287 hasta 331 por mm2), células epidérmicas (2871 a 2269 por mm2), índice estomático (8.95 a 9.86) y tamaño de estomas (23.24 a 25.95 µm) y presentan diferencias...
Tipo: Tesis
Palavras-chave: Citrus latifolia; Portainjertos; Estomas; Anatomía de xilema; Doctorado; Fruticultura; Citrus latifolia; Rootstocks; Stomata; Xylem anatomy; Development.
Ano: 2009
URL: http://hdl.handle.net/10521/1366

Caracterización química y estomática y crecimiento de tallos de Acanthocereus tetragonus, A. Subinermis e Hylocereus undatus.
Provedor de dados: 32
Autores: Juárez Cruz, Aída.
Entre las especies con potencial productivo, sobresalen la cruceta o jacube (Acanthocereus tetragonus), el nopal de cruz (Acanthocereus subinermis) y la pitahaya (Hylocereus undatus.) porque tienen uso como cerco vivo, ornamento, medicina y alimento en diferentes regiones de México. Sin embargo, existe poca información sobre el valor nutritivo y características anatómicas de éstos materiales, principalmente del género Acanthocereus; por lo anterior, la presente investigación tuvo como objetivo generar información que permita sustentar el uso de tallos jóvenes de estas especies como parte de la dieta humana, y también conocer aspectos anatómicos que pueden ser útiles en su manejo agronómico. La investigación se realizó en un huerto ubicado en Tepoztlán,...
Palavras-chave: Jacube; Cruceta; Nopal de cruz; Pitahaya; Análisis proximal; Estomas; Proximal analysis; Stomata; Maestría; Fisiología Vegetal.
Ano: 2011
URL: http://hdl.handle.net/10521/375

Estudios sobre la morfología y oscurecimiento del pericarpio de frutos de rambután (Nephelium lappaceum Linn.).
Provedor de dados: 32
Autores: Caballero Pérez, Juan Francisco.
El oscurecimiento del pericarpio en frutos de rambután a pocos días después de la cosecha demerita su calidad limitando su comercialización. La producción de rambután a nivel comercial  ha aumentado considerablemente en el sur de México por lo que se ha visto la necesidad de estudiar aspectos de la fisiología del fruto relacionados con la oxidación del pericarpio durante el manejo postcosecha. Las tecnologías postcosecha usadas para reducir el obscurecimiento no han sido efectivas pues tienen beneficios limitados. Por lo anterior, es indispensable conocer el origen del  problema e implementar tecnologías que resulten en mayor vida de anaquel. En este sentido, los objetivos de esta investigación fueron conocer las características morfológicas, anatómicas,...
Palavras-chave: Desarrollo de fruto; Histología; Pericarpio; Estomas; Oscurecimiento; Postcosecha; Fruit development; Histology; Pericarp; Stomata; Browning; Postharvest; Doctorado; Fruticultura.
Ano: 2012
URL: http://hdl.handle.net/10521/775

Estudios sobre la morfología y oscurecimiento del pericarpio de frutos de rambután (Nephelium lappaceum Linn.).
Provedor de dados: 32
Autores: Caballero Pérez, Juan Francisco.
El oscurecimiento del pericarpio en frutos de rambután a pocos días después de la cosecha demerita su calidad limitando su comercialización. La producción de rambután a nivel comercial  ha aumentado considerablemente en el sur de México por lo que se ha visto la necesidad de estudiar aspectos de la fisiología del fruto relacionados con la oxidación del pericarpio durante el manejo postcosecha. Las tecnologías postcosecha usadas para reducir el obscurecimiento no han sido efectivas pues tienen beneficios limitados. Por lo anterior, es indispensable conocer el origen del  problema e implementar tecnologías que resulten en mayor vida de anaquel. En este sentido, los objetivos de esta investigación fueron conocer las características morfológicas, anatómicas,...
Palavras-chave: Desarrollo de fruto; Histología; Pericarpio; Estomas; Oscurecimiento; Postcosecha; Fruit development; Histology; Pericarp; Stomata; Browning; Postharvest; Doctorado; Fruticultura.
Ano: 2012
URL: http://hdl.handle.net/10521/775

Malformación de raíz en vivero de portainjertos de cítricos tolerantes a VTC. aspectos anatómicos y fisiológicos
Provedor de dados: 32
Autores: Arrieta Ramos, Beatríz Guillermina.
Durante el desarrollo de portainjertos en vivero, puede presentarse malformación de raíz, que crece en forma de ‘bancal’ o realizando un giro de 360°. Cuando son trasplantadas a raíz desnuda, las plantas que presentan este problema son eliminadas, sin embargo, con cepellón, muchos árboles con raíz malformada podrían ser establecidos en huertas comerciales.  Se realizó el diagnóstico de la proporción y grado de malformación de raíz en seis portainjertos en dos viveros comerciales. Se determinó anatómicamente el punto donde ocurre la malformación y el efecto de la posición de la semilla en la malformación de la raíz. En vivero se evaluó el grado de malformación de raíz en el desarrollo de las plantas, contenido nutrimental, número y tamaño de estomas y...
Palavras-chave: Portainjertos; Citrus; Malformación en raíz; Nutrición; Vasos; Estomas; Vivero; Rootstocks; Citrus; Root; Malformation; Nutrition; Vessels; Stomata; Nursery; Doctorado; Fruticultura.
Ano: 2010
URL: http://hdl.handle.net/10521/111

Estomas en hojas y anatomía de xilema en tallo de lima Persa en diferentes portainjertos
Provedor de dados: 32
Autores: Berdeja Arbeu, Raúl.
En cítricos existen pocos trabajos en donde se estudia el efecto de los portainjertos en las características estomáticas  en hojas de lima 'Persa' y anatomía de xilema de los portainjertos y lima 'Persa' y su correlación con vigor de planta, por lo que se realizaron dos experimentos.  En el primero se estudió la combinación lima 'Persa' en 11 portainjertos cítricos (citranges 'C32', 'C35', 'Benton', 'Carrizo', 'Florida' y 'Morton', los mandarinos 'Amblicarpa' y 'Cleopatra', limón 'Volkameriano', 'Flying Dragon' y naranjo 'Agrio' como testigo), los portainjertos modificaron el número de estomas (287 hasta 331 por mm2), células epidérmicas (2871 a 2269 por mm2), índice estomático (8.95 a 9.86) y tamaño de estomas (23.24 a 25.95 µm) y presentan diferencias...
Tipo: Tesis
Palavras-chave: Citrus latifolia; Portainjertos; Estomas; Anatomía de xilema; Desarrollo index words: Citrus latifolia; Rootstocks; Stomata; Xylem anatomy; Development.
Ano: 2012
URL: http://hdl.handle.net/10521/1034

Estimadores de fotosíntesis en selecciones de zapote mamey (Pouteria sapota (Jacq.) H. E. Moore &amp; Stearn).
Provedor de dados: 32
Autores: Ledesma Miramontes, Alejandro.
En frutales, debido a que no es práctico eliminar toda la planta para evaluar fotosíntesis es necesario utilizar estimadores para este proceso. Con el fin de conocer las diferencias que existen en la actividad fotosintética en seis selecciones injertadas de zapote mamey se evaluaron diferentes estimadores. La investigación se llevó a cabo en una huerta comercial en el municipio de Alpoyeca Gro. Se utilizaron árboles de 3 y 4 años. Las variables evaluadas fueron: peso específico de la hoja (PEH), grosor de la hoja, frecuencia y tamaño de estomas, contenido de clorofila, concentración de azúcares y medición del intercambio de gases. El diseño experimental utilizado, fue completamente al azar, con diferente número de repeticiones dependiendo de la variable....
Palavras-chave: Pouteria sapota; Sapotaceae; Grosor de hoja; Estomas; Azúcares; Leaf thickness; Stomata; Sugars; Maestría; Fruticultura.
Ano: 2011
URL: http://hdl.handle.net/10521/411

Malformación de raíz en vivero de portainjertos de cítricos tolerantes a VTC. aspectos anatómicos y fisiológicos
Provedor de dados: 32
Autores: Arrieta Ramos, Beatríz Guillermina.
Durante el desarrollo de portainjertos en vivero, puede presentarse malformación de raíz, que crece en forma de ‘bancal’ o realizando un giro de 360°. Cuando son trasplantadas a raíz desnuda, las plantas que presentan este problema son eliminadas, sin embargo, con cepellón, muchos árboles con raíz malformada podrían ser establecidos en huertas comerciales.  Se realizó el diagnóstico de la proporción y grado de malformación de raíz en seis portainjertos en dos viveros comerciales. Se determinó anatómicamente el punto donde ocurre la malformación y el efecto de la posición de la semilla en la malformación de la raíz. En vivero se evaluó el grado de malformación de raíz en el desarrollo de las plantas, contenido nutrimental, número y tamaño de estomas y...
Palavras-chave: Portainjertos; Citrus; Malformación en raíz; Nutrición; Vasos; Estomas; Vivero; Rootstocks; Citrus; Root; Malformation; Nutrition; Vessels; Stomata; Nursery; Doctorado; Fruticultura.
Ano: 2010
URL: http://hdl.handle.net/10521/111

Estimadores de fotosíntesis en selecciones de zapote mamey (Pouteria sapota (Jacq.) H. E. Moore &amp; Stearn).
Provedor de dados: 32
Autores: Ledesma Miramontes, Alejandro.
En frutales, debido a que no es práctico eliminar toda la planta para evaluar fotosíntesis es necesario utilizar estimadores para este proceso. Con el fin de conocer las diferencias que existen en la actividad fotosintética en seis selecciones injertadas de zapote mamey se evaluaron diferentes estimadores. La investigación se llevó a cabo en una huerta comercial en el municipio de Alpoyeca Gro. Se utilizaron árboles de 3 y 4 años. Las variables evaluadas fueron: peso específico de la hoja (PEH), grosor de la hoja, frecuencia y tamaño de estomas, contenido de clorofila, concentración de azúcares y medición del intercambio de gases. El diseño experimental utilizado, fue completamente al azar, con diferente número de repeticiones dependiendo de la variable....
Palavras-chave: Pouteria sapota; Sapotaceae; Grosor de hoja; Estomas; Azúcares; Leaf thickness; Stomata; Sugars; Maestría; Fruticultura.
Ano: 2011
URL: http://hdl.handle.net/10521/411

COMPARATIVE FOLIAR EPIDERMAL MORPHOLOGY OF THE WEST AFRICAN SPECIES OF THE GENUS AFZELIA SMITH (LEGUMINOSAE: AESALPINIOIDEAE)
Provedor de dados: 73
Autores: Babalola Kadiri,Akeem; Dele Olowokudejo,James.
The epidermal features of the leaves of the six West African species of Afzelia were examined and compared using light and scanning electron microscopy. The leaves are hypostomatic in all species and stomatal type is paracytic. Anticlinal walls may be undulate or straight-curved and stomatal index ranges from 17.48% in A. bella var. gracilior to 25.20% in A. bipindensis. Porrect and flattened scales distinguish the infra-specific taxa of A. bella while presence of unicellular trichomes separates A. pachyloba from other species. The leaf surface is entirely covered by epicuticular wax deposits and the stomata are either raised or sunken in the genus. Using these foliar epidermal characters, an artificial key has been prepared to facilitate identification of...
Tipo: Journal article
Palavras-chave: Afzelia; Stomata; Epidermal cell; Morphology; Taxonomy.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432008000100008

Chromosomal and morphological studies of diploid and polyploid cytotypes of Stevia rebaudiana (Bertoni) Bertoni (Eupatorieae, Asteraceae)
Provedor de dados: 74
Autores: Oliveira,Vanessa M. de; Forni-Martins,Eliana R.; Magalhães,Pedro M.; Alves,Marcos N.
In this study, we examined the chromosome number and some morphological features of strains of Stevia rebaudiana. The chromosomes were analyzed during mitosis and diakinesis, and the tetrad normality and pollen viability were also assessed. In addition, stomata and pollen were measured and some plant features were studied morphometrically. All of the strains had 2n = 22, except for two, which had 2n = 33 and 2n = 44. Pairing at diakinesis was n = 11II for all of the diploid strains, whereas the triploid and tetraploid strains had n = 11III and n = 11IV, respectively. Triploid and tetraploid plants had a lower tetrad normality rate than the diploids. All of the strains had inviable pollen. Thus, the higher the ploidy number, the greater the size of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Asteraceae; Pollen; Polyploidy; Stevia rebaudiana; Stevioside; Stomata.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572004000200015

Comparative morphology on leaves of Daphniphyllum (Daphniphyllaceae)
Provedor de dados: 16
Autores: Tang, M.-S.; Yang, Y.-P.; Sheue, C.-R.
A comparative anatomical study on the leaves of nine out of 29 species of the genus Daphniphyllum was performed to seek support for the present infrageneric classification. Daphniphyllum is composed of two sections, Lunata (with one subsection Lunata) and Daphniphyllum (with two subsections, Daphniphyllum and Staminodia). The glabrous leaves with brachyparacytic stomata appear in all species in this study; hemiparacytic, laterocytic or anomocytic stomata occur in some taxa. Two (out of three) species of section Lunata show irregular epidermal cells with undulate anticlinal walls on both surfaces and hemiparacytic stomata. Of section Daphniphyllum seven (out of 26) species were sampled; they have curved, straight or undulate anticlinal cell walls and...
Tipo: Article / Letter to the editor
Palavras-chave: Daphniphyllaceae; Daphniphyllum; Epidermis; Leaf anatomy; Lunata; Stomata.
Ano: 2009
URL: http://www.repository.naturalis.nl/record/524761

Aspects of leaf anatomy of kudzu (Pueraria lobata, Leguminosae-Faboideae) related to water and energy balance
Provedor de dados: 86
Autores: Pereira-Netto,Adaucto Bellarmino de; Gabriele,Antonio Carlos; Pinto,Hilton Silveira.
Kudzu is a cover crop that has escaped cultivation in some subtropical and warm temperate regions. Kudzu has previously demonstrated broad intraspecific physiological plasticity while colonizing new environments. The objective of this paper was to investigate characteristics of kudzu leaflet anatomy that might contribute to its successful growth in climatically distinct environments, and to escape cultivation as well. Fresh and fixed leaflet strips of field-grown plants were analyzed. The lower epidermis of kudzu showed a higher frequency of stomata (147 ± 19 stomata mm-2) than the upper epidermis (26 ± 17 stomata mm-2). The average number of trichomes per square milimeter was 8 for both the upper and the lower epidermis. The average trichome length was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cuticle thickness; Ecophysiology; Leaflet anatomy; Stomata; Trichomes.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X1999000800006

Ontogenesis of stomata in Velloziaceae: paracytic versus tetracytic?
Provedor de dados: 88
Autores: Amaral,Marina Milanello do; Mello-Silva,Renato de.
In Velloziaceae, the number of subsidiary cells has been used to characterize species and support groups. Nevertheless, the homology of the stomatal types have not been scrutinized. Stomatal ontogenesis of Vellozia epidendroides and V. plicata, assigned to have tetracytic stomata, and of V. glauca and Barbacenia riparia, assigned to have paracytic stomata, were investigated. In the four species studied, stomata followed perigenic development. Subsidiary cells arise from oblique divisions of neighbouring cells of the guard mother cell (GMC). These cells are elongated and parallel to the longer axis of the stoma. Polar cells show wide variation, following the shape and size of the epidermal cells in the vicinity. Hence, these cells cannot be called...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ontogenesis; Paracytic; Stomata; Tetracytic; Velloziaceae.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042008000300016

Coffee leaf and stem anatomy under boron deficiency
Provedor de dados: 90
Autores: Rosolem,Ciro Antonio; Leite,Vagner Maximino.
Boron deficiency in coffee is widely spread in Brazilian plantations, but responses to B fertilizer have been erratic, depending on the year, form and time of application and B source. A better understanding of the effects of B on plant physiology and anatomy is important to establish a rational fertilization program since B translocation within the plant may be affected by plant anatomy. In this experiment, coffee plantlets of two varieties were grown in nutrient solutions with B levels of 0.0 (deficient), 5.0 µM (adequate) and 25.0 µM (high). At the first symptoms of deficiency, leaves were evaluated, the cell walls separated and assessed for B and Ca concentrations. Scanning electron micrographs were taken of cuts of young leaves and branch tips. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Boron deficiency; Ca/B ratio; Coffee nutrition; Stomata.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832007000300007

Acclimatization and leaf anatomy of micropropagated fig plantlets
Provedor de dados: 94
Autores: Chirinéa,Chrystiane Fráguas; Pasqual,Moacir; Araujo,Aparecida Gomes de; Pereira,Alba Regina; Castro,Evaristo Mauro de.
The survival of micropropagated plants during and after acclimatization is a limiting process to plant establishment. There is little information on how the anatomy of vegetative organs of Ficus carica can be affected by culture conditions and acclimatization. The present research aimed to study the effects of time on culture medium and substrates during the acclimatization of fig tree plantlets produced in vitro, characterizing some leaf anatomy aspects of plantlets cultured in vitro and of fig trees produced in field. Plantlets previously multiplied in vitro were separated and transferred into Wood Plant Medium (WPM) where they were kept for 0, 15, 30, 45 and 60 days. Different substrates were tested and studies on leaf anatomy were performed in order to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ficus carica L.; Substrate; Stomata; Parenchyma.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452012000400027

Relationships between leaf anatomy, morphology, and water use efficiency in Aloe vera (L) Burm f. as a function of water availability
Provedor de dados: 97
Autores: Silva,Herman; Sagardia,Susana; Ortiz,Mauricio; Franck,Nicolás; Opazo,Marcela; Quiroz,Madeleine; Baginsky,Cecilia; Tapia,Cristián.
The effects of water availability were evaluated on the photosynthetic tissue anatomy in Aloe vera(L) Burm f. and its relationship with morphological, physiological parameters, and water use efficiency as a function of aerial biomass and gel production. Plants were subjected to four levels of water availability equivalent to 20% (T1), 15% (T2), 10% (T3), and 5% (T4) of the atmospheric evaporative demand. The plants exhibited anatomical, morphological, and physiological responses to the different watering treatments. The extreme treatments produced negative responses due to excess water in T1 and water deficit in T4. Treatments T2 and T3 elicited positive responses in cell characteristics and productivity. Anatomical and structural characteristics were...
Tipo: Journal article
Palavras-chave: Anatomical adaptations; Biomass production; Growth; Stomata.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2014000100012

Silicon location through backscattered electron imaging and X-ray microanalysis in leaves of Cyperus ligularis L. and Rhynchospora aberrans C. B. Clarke (Cyperaceae)
Provedor de dados: 39
Autores: Estelita,Maria Emília Maranhão; Rodrigues,Ana Claudia.
The Cyperaceae show the ability to incorporate silicon by depositing colloidal silica, which is recorded by the occurrence of projections in the form of cones, in inner tangential walls of some epidermal cells or "silica cells". Leaves of C. ligularis and R. aberrans were analyzed through the technique of electron backscatter. Cyperus ligularis accumulates silica, in addition to "silica cells", in some stomata, trichomes and the cell walls that surround the cavities of the aerenchyma. The silica in the latter occurs in various forms; however, the cells located near the vascular bundles have conical projections, similar to those of the epidermis. Rhynchospora aberrans presents "silica cells" whose projections have tapered "satellites". In this species,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Stomata; Epidermal cells; Trichomes; Cell walls.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062012000200004

Structural and functional leaf traits of two Gochnatia species from distinct growth forms in a sclerophyll forest site in Southeastern Brazil
Provedor de dados: 39
Autores: Rossatto,Davi Rodrigo; Kolb,Rosana Marta.
Gochnatia is very common in different phytophysiognomies in the Cerrado of São Paulo State, occupying open and closed areas. In this study, we compared the leaf anatomy and some ecophysiological traits of two species of Gochnatia, one a shrub (Gochnatia barrosii Cabrera) and the other a tree (Gochnatia polymorpha (Less.) Cabrera), which both occur in an area of "cerradão" at the Estação Ecológica de Assis, SP. We found qualitative structural differences between the species, with G. barrosii presenting amphistomatic leaves with a uniseriate epidermis and G. polymorpha showing hypostomatic leaves and a multiple epidermis or hypodermis on the adaxial surface. Moreover, the G. barrosii leaves had lower values in tissue thickness (with the exception of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cerrado; Gas exchange; Leaf anatomy; Stomata.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062012000400014

Anatomia foliar de ipê-branco (Tabebuia roseo Alba (Ridl.) Sand.) – Bignoniaceae, proveniente do cultivo ex vitro e in vitro - DOI: 10.4025/actascibiolsci.v31i3.1937
Provedor de dados: 3
Autores: Abbade, Leticia Caravita; UFLA; Paiva, Patrícia Duarte de Oliveira; UFLA; Paiva, Renato; UFLA; Castro, Evaristo Mauro de; UFLA; Centofante, Agda Rabelo; UFLA; Oliveira, Cynthia de; UFLA.
Este estudo teve como objetivo comparar a estrutura interna de folhas de ipê-branco cultivadas in vitro e ex vitro. Para as avaliações anatômicas foram utilizadas folhas do primeiro nó de ramos, da base para o ápice, com 30 dias de cultivo in vitro e de plantas de campo. O estudo anatômico foi feito por meio das secções transversais e paradérmicas das folhas. As folhas apresentam epiderme uniestratificada e mesofilo dorsiventral. São hipostomáticas e apresentam tricomas em todas as faces. Folhas de plantas cultivadas ex vitro, quando comparadas com in vitro, tiveram espessura do limbo foliar, nervura central da epiderme adaxial e abaxial e os parênquimas paliçádico e esponjoso maiores. Em folhas oriundas do cultivo in vitro, a cutícula e o esclerênquima...
Palavras-chave: 2.00.00.00-6    Ciências Biológicas anatomia; Folhas; Estômatos; Nervura central; In vitro; Ex vitro Anatomia vegetal anatomy; Leaves; Stomata; Central nervure; In vitro; Ex vitro.
Ano: 2009
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/1937

Leaf surfaces of Gomphrena spp. (Amaranthaceae) from Cerrado biome
Provedor de dados: 47
Autores: Carvalho,Suzane Margaret Fank-de-; Gomes,Misléia Rodrigues de Aguiar; Silva,Pedro Ítalo Tanno; Báo,Sônia Nair.
The leaf structure and micromorphology characterize plant species and reflex its interactions with the environment. Leaf epidermis sculptures aid high transpiration plants on light reflection. The form and distribution of epicuticular wax crystalloids are important to characterize the surface. Aiming to know the micromorphology and the ultrastructure of G. arborescens, G. pohlii and G. virgata, leaves of these Cerrado native species were collected in Brasília, Distrito Federal, Brazil, at the Olympic Center of the Universidade de Brasília and at Reserva Ecológica do Roncador. Leaves of G. globosa, an Indian native species, were also studied for comparison. Leaves were fractionated, fixed and treated for observation under optical and scanning electron...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anatomy; Epicuticular wax; Platelets; Trichomes; Stomata.
Ano: 2010
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-95452010000100004

Epidermal characteristics of toxic plants for cattle from the Salado River basin (Buenos Aires, Argentina)
Provedor de dados: 51
Autores: Freire,Susana E.; Arambarri,Ana M.; Bayón,Néstor D.; Sancho,Gisela; Urtubey,Estrella; Monti,Claudia; Novoa,María C.; Colares,Marta N.
One hundred and eighty species belonging to 41 families inhabiting the Salado River Basin of the province of Buenos Aires (Argentina) were previously reported to be toxic for cattle. The purpose of this study was to provide a tool to distinguish the taxa when the plant material is desintegrated. In this way, an approach to the identification of these taxa through leaf epidermal features (anticlinal epidermal cell wall patterns, cuticular ornamentation, stomata, and hair types) is performed. A key to the 180 species as well as illustrations of diagnostic characters are given.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Buenos Aires; Salado River Basin; Toxic plants; Anatomy; Epidermal characters; Stomata; Hairs; Dicotyledons; Monocotyledons.
Ano: 2005
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-23722005000200010

Stomatal distribution, stomatal density and daily leaf movement in Acacia aroma (Leguminosae)
Provedor de dados: 51
Autores: Hernández,Marcelo P.; ArambarriI,Ana M.
Acacia aroma Gillies ex Hook. &amp;amp; Arn. grows in the Chacoan and Yungas Biogeographic Provinces, Argentina. It has numerous medicinal applications, sweet and edible fruits, and it may be used as forage. The objective of the present contribution was to analyse the stomatal distribution and stomatal density on the secondary leaflet surfaces, in different parts of the leaf, and at different tree crown levels, establishing the leaf movement and environmental condition relationships. The work was performed with fresh material and herbarium specimens, using conventional anatomical techniques. Stomatal distribution on the secondary leaflet surfaces was established, and differences in stomatal density among basal, medium and apical leaflets were found. A...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acacia aroma; Leaf movement; Leguminosae; Stomata.
Ano: 2010
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-23722010000200007

Plant cells in the context of climate change
Provedor de dados: 52
Autores: Machado,Marcelo Rubens.
Global warming and its origins triggered the beginning to considerable discussion in the last century. Studies of climate models presented in multidisciplinary scientific reports suggest that anthropogenic activities, particularly the emission of gases from the greenhouse effect, are greatly responsible for the current climate changes. The increase of carbon dioxide (CO2) atmospheric concentration has been in discussion in the news, scientific meetings and in public policy debates in several countries. Apart from its impact on global warming, the rising atmospheric CO2 has alerted the scientific community to the need to investigate any morpho-physiological alterations in the plants, given their direct influence on photosynthesis. This article aims to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carbon dioxide; Global warming; Stomata; Climate change biology; Plant cell; Waxes.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132014000100018

Leaf surface characters applied to Lauraceae taxonomy in a Seasonal Forest of Southern Brazil
Provedor de dados: 52
Autores: Ceolin,Guilherme Bordignon; Rosito,Jumaida Maria; Canto-Dorow,Thais Scotti do.
The goal of this work was to test if the macro and micro morphological analysis of the leaf surface could provide vegetative diagnostic characters for some of the most common Lauraceae species in Southern Brazilian Seasonal Forests. The leaf printing technique with universal instantaneous adhesive was used for the epidermical microscopical analysis and external macroscospical analyses of leave were made. Microscopic evaluation revealed the visibility and contours of anticlinal walls of epidermical cell and stomata and shape of guard-cells. Macroscopic evaluation showed the absence or presence of characters such as hairiness, domatia and scents. The results showed that analyzed characters, together with other diagnostic characteristics, could contribute in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lauraceae; Leaf surface; Printing; Seasonal Forests; Stomata.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000600017

Leaf anatomy changes related to physiological adaptations to flooding in Amazonian tree species
Provedor de dados: 61
Autores: Herrera,Ana; Escala,Marcia; Rengifo,Elizabeth.
In trees of the seasonally flooded forest of the Mapire River in Venezuela, early flooding induces a reversible diminution in leaf conductance and photosynthetic rate. With the aim of finding an anatomical explanation for the observed responses of leaf gas exchange, the characteristics of emerged leaves developed under drainage or after three months of flooding were examined in the tree species Acosmium nitens, Campsiandra laurifolia, Duroia fusifera, Eschweilera tenuifolia, Pouteria orinocoensis and Symmeria paniculata and in leaves developed only under flooding in Inga spuria and Tachigali davidsei. Anatomy was remarkably similar among species and families and consisted of a bi-layered palisade parenchyma, a 5-6-cell-thick spongy parenchyma and large...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Flooding; Palisade; Parenchyma; Sclerenchyma; Spongy; Stomata; Tropical trees.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202009000400006

Transpiration, leaf diffusive conductance, and atmospheric water demand relationship in an irrigated acid lime orchard
Provedor de dados: 61
Autores: Angelocci,Luiz Roberto; Marin,Fábio Ricardo; Oliveira,Ricardo Ferraz de; Righi,Evandro Zanini.
Leaf vapor diffusive conductance (gl) and transpiration (T) measurements in an irrigated orchard of the acid lime "Tahiti" were carried out in a subtropical climatic condition in the State of São Paulo, Brazil. Measurements were made using steady-state null-balance porometers and were taken throughout the day, on several occasions from February to November, 1998. During September and October, measurements were performed on exposed and shaded young and fully expanded leaves, as well as on old leaves inside the tree canopy. The old leaves showed lower values of gl and T when compared to the other groups. In the other months, measurements were taken only with exposed and shaded fully expanded leaves. The highest values of gl and T were obtained from February...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Air temperature; Photosynthetic photon flux density; Porometry; Stomata; Vapor pressure deficit.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202004000100008

CO2 assimilation, photosynthetic light response curves, and water relations of 'Pêra' sweet orange plants infected with Xylella fastidiosa
Provedor de dados: 61
Autores: Habermann,Gustavo; Machado,Eduardo Caruso; Rodrigues,João Domingos; Medina,Camilo Lázaro.
Plants with citrus variegated chlorosis (CVC), a disease caused by the xylem-limited bacteria Xylella fastidiosa, have leaves with water deficiency symptoms and are associated with decreases on the net photosynthesis and transpiration rates. Using healthy and CVC-affected 'Pêra' sweet orange plants on 'Rangpur' lime rootstock, the leaf gas exchange variables were measured with an open-gas portable photosynthesis system. All plants were watered and the leaf water potential (Yw) was measured by isopiestic thermocouple psychrometric technique. The net photosynthesis (A) vs. internal leaf CO2 concentration (A/Ci curves) was analyzed. The relative effect of stomatal resistance on photosynthesis (S%) and the estimation of carboxylation efficiency were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: A/Ci curves; Citrus variegated chlorosis; Citrus sinensis L. Osbeck; Photosynthetic photon flux density; Photosynthetic metabolism; Stomata.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202003000200003

Comparative stomatal conductance and chlorophyll a fluorescence in leaves vs. fruits of the cerrado legume tree, Dalbergia miscolobium
Provedor de dados: 61
Autores: Lemos Filho,José Pires de; Isaias,Rosy Mary dos Santos.
The aim of this study was to compare water vapor conductance and chlorophyll a fluorescence between leaflets and fruits of Dalbergia miscolobium, the Jacaranda tree. The frequency of stomata on the leaflets was 20 times higher than that observed on the fruits, and this was related with the lower conductance of the fruits in comparison with the leaflets. The potential quantum yield of PSII (Fv /Fmax) was significantly lower in fruits than in leaflets. The Fv /Fmax values for leaflets increased to over 0.8 during the afternoon, indicating the occurrence of dynamic photoinhibition. In contrast, Fv /Fmax values for fruits remained low even at early morning, indicating the occurrence of chronic photoinhibition. The maximum values of effective quantum yield...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Jacaranda tree; Stomata; Quantum efficiency of PSII; Water vapor conductance.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202004000200004

Physiological characteristics of cassava tolerance to prolonged drought in the tropics: implications for breeding cultivars adapted to seasonally dry and semiarid environments
Provedor de dados: 61
Autores: El-Sharkawy,Mabrouk A.
The paper summarizes research conducted at International Center for Tropical Agriculture (CIAT) on responses of cassava to extended water shortages in the field aided by modern gas-exchange and water-relation techniques as well as biochemical assays. The aim of the research was to coordinate basic and applied aspects of crop physiology into a breeding strategy with a multidisciplinary approach. Several physiological characteristics/traits and mechanisms underpinning tolerance of cassava to drought were elucidated using a large number of genotypes from the CIAT core germplasm collection grown in various locations representing ecozones where cassava is cultivated. Most notable among these characteristics are the high photosynthetic capacity of cassava leaves...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Agriculture; Breeding; Canopy; Carboxylation enzymes; C3-C4 intermediate; Ecophysiology; Growth; Leaf photosynthesis; Manihot sp.; PEP carboxylase; Productivity; Stomata; Water stress; Yield.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202007000400003

Differential capacity of nitrogen assimilation between apical and basal leaf portions of a tank epiphytic bromeliad
Provedor de dados: 61
Autores: Takahashi,Cassia A.; Ceccantini,Gregório C.T.; Mercier,Helenice.
The leaf is the main organ of the vegetative body of tank epiphytic bromeliads, which may be subdivided into apical and basal parts. Little is known about the existence of morphological, anatomical or physiological differences between these two leaf portions. The objective of this study was to verify the existence of a differential capacity to assimilate nitrogen from urea between basal and apical leaf portions of Vriesea gigantea, a tank epiphytic bromeliad. Plants were cultivated in vitro in the presence of 5 mM urea for 15 days. During this period, the activities of the enzymes glutamine synthetase (GS, EC 6.3.1.2) and NADH-dependent glutamate dehydrogenase (NADH-GDH, EC 1.4.1.2) were quantified, as well as the densities of trichomes and stomata found...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bromeliaceae; Glutamate dehydrogenase; Glutamine synthetase; Stomata; Trichome; Urea.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202007000200004

Effects of changes in the photosynthetic photon flux density on net gas exchange of Citrus limon and Nicotiana tabacum
Provedor de dados: 61
Autores: Pimentel,Carlos; Ribeiro,Rafael Vasconcelos; Santos,Mauro Guida dos; Oliveira,Ricardo Ferraz de; Machado,Eduardo Caruso.
The objective of this study was to evaluate the effects of changes in the photosynthetic photon flux density (PPFD) on net gas exchange of Citrus limon, a woody species, and Nicotiana tabacum, an herbaceous species. When PPFD was increased from 50 to 350 mumol.m-2.s-1 and returned to 50 mumol.m-2.s-1 after 60 min, the CO2 assimilation rate (A) increased and stabilized after 15 min in both species. Stomatal conductance (g s), however, continued to increase. After returning to low PPFD, A immediately diminished to a low value for both lemon and tobacco. Stomatal conductance of lemon diminished slowly over 60 min, whereas g s for tobacco took only 15 min to decrease. This difference in behavior is probably due to over-sensitivity of stomata of woody species,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: CO2 assimilation rate; Gas exchange; Stomata; Intrinsic water use efficiency.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202004000200002

Leaf Surface Scanning Electron Microscopy of 16 Mulberry Genotypes (Morus spp.) with Respect to their Feeding Value in Silkworm (Bombyx mori L.) Rearing
Provedor de dados: 117
Autores: Singhal,B.K; Baqual,M.F; Khan,M.A; Bindroo,B.B; Dhar,A.
Mulberry (Morus spp.) is the only silkworm (Bombyx mori L.) food plant. In Indian sub tropics, S-146 is the only popular and ruling mulberry genotype for silkworm rearing. As a result, mulberry leaf availability is always the limiting factor, and therefore, sub tropics are contributing less than 1% of the country’s total silk production compared with more than 60% under tropical conditions. Besides climatic conditions, this is due to a very limited number of mulberry genotypes available in this region for silkworm rearing. However, in the mean time, 15 mulberry genotypes viz. &amp;#8216;Tr-10&amp;#8217;,&amp;#8216;Chinese White&amp;#8217;,&amp;#8216;K-2&amp;#8217;,&amp;#8216;Sujanpur...
Tipo: Journal article
Palavras-chave: Scanning electron microscopy; Stomata; Trichomes; Idioblasts; Leaf yield; Sericulture.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392010000200001