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Análise ultra-estrutural de folhas de três espécies de Solanaceae após inoculação com o vírus da necrose branca do tomateiro (VNBT - Tymovirus) Rev. Bras. Bot.
TANAKA,FRANCISCO ANDRÉ OSSAMU; MACHADO,SÍLVIA RODRIGUES; BARRADAS,MARIA MÉRCIA.
Foi estudada a ultra-estrutura foliar das solanáceas Nicotiana glutinosa L., Lycopersicon pimpinellifolium L. e Physalis angulata L. inoculadas com o vírus da necrose branca do tomateiro (VNBT - Tymovirus). As plantas mantidas em casa-de-vegetação com temperatura constante de 25 °C foram inoculadas quando apresentavam três a quatro folhas totalmente expandidas. Quinze dias após a inoculação, foram coletadas amostras do terço médio do limbo da 3ª ou da 4ª folha a partir do ápice. As amostras foram preparadas para análise em microscopia eletrônica de transmissão segundo técnicas convencionais. A análise ultra-estrutural das células do clorênquima revelou principalmente vesiculação e vacuolação dos cloroplastos e de mitocôndrias, além da ocorrência de corpos...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Tymovirus; TWNV; Solanaceae; Leaf; Ultrastructure.
Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042000000200006
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Caracterização do pasto e da extrusa de novilhas Girolanda, em pastagem de Brachiaria decumbens, submetidas a diferentes taxas de lotação - doi: 10.4025/actascianimsci.v33i2.9379 Animal Sciences
Silva, Andrezza Miguel da; UFRPE; Modesto, Elisa Cristina; UFRRJ; Lira, Carolina Câmara; UFRPE; Santos, Mércia Virginia Ferreira dos; UFRPE; Brasil, Lucia Helena de Albuquerque; UFRPE; Dubeux Júnior, José Carlos Batista; UFRPE.
O objetivo deste trabalho foi avaliar as características do pasto e da extrusa de novilhas Girolanda, submetidas a três taxas de lotação, em pastagem de capim Brachiaria decumbens Stapf., em diferentes períodos de avaliação. Foram utilizadas seis novilhas da raça Girolanda e os tratamentos foram constituídos por diferentes taxas de lotação (2, 4 e 6 UA); cada bloco foi formado por três piquetes. O delineamento foi de blocos ao acaso em parcelas subdivididas com medidas repetidas no tempo. A taxa de bocados dos animais variou com o período de avaliação, com valores de 41 bocados min.-1 (Período 1) e 33 bocados min. -1 (Período 3). A taxa de bocados reduziu ao longo dos períodos de pastejo com valores de 41 a 33 bocados min. -1 Já o tamanho do bocado...
Tipo: Pesquisa de campo;análise laboratorial Palavras-chave: Produção animal; Comportamento animal; Bocado; Colmo; Folha; Material senescente Comportamento animal Bite; Stem; Leaf; Senescent material.
Ano: 2011 URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/9379
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Chemical composition of essential oils of peltate glandular trichomes from leaves and flowers of Lepechinia floribunda (Lamiaceae) Boletín de la Sociedad
CAMINA,JULIA L.; DAMBOLENA,JOSÉ S.; ZYGADLO,JULIO A.; ASHWORTH,LORENA.
The knowledge of the chemical composition of different plant organs provides valuable Information for clarifying the functionality of secondary metabolites. Essential oils are secondary metabolites produced and stored in secretory structures on leaves, flowers, and steam. Many studies have shown that the chemical composition of the essential oil can differ depending on the plant organ and the secretory structures even if they are at the same organ. Such differences may be the consequence that organs also differ in type and density of glandular structure. Moreover, the same type of glandular structure can change its chemical composition depending on its position within the same organ. However, no study has been evaluating the chemical composition of the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Anther; Glandular trichome; Lamiaceae; Leaf; Lepechinia floribunda; Terpenes.
Ano: 2018 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-23722018000300003
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Colleters in Chamaecrista (L.) Moench sect. Chamaecrista and sect. Caliciopsis (Leguminosae-Caesalpinioideae): anatomy and taxonomic implications Acta Botanica
Silva,Marinalva dos Santos; Coutinho,Ítalo Antônio Cotta; Araújo,Maicon Nascimento; Meira,Renata Maria Strozi Alves.
ABSTRACT The genus Chamaecrista contains ca. 330 species organized into six sections, of which section Chamaecrista is the second largest (ca.75 species) distributed among six series, while the section Caliciopsis contains only two species. Colleters have been described in the genus Chamaecrista and they show potential taxonomic and phylogenetic significance. They are associated with lubrication, desiccation prevention and protection from microbial attacks of young developing organs. Although six types of colleters have been described for the genus Chamaecrista, there have been no studies focusing on the diversity of colleters in the sections Chamaecrista and Caliciopsis. Samples from developing leaves and flowers of both sections were obtained from...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Colleter; Flower; Histochemical analysis; Leaf; Polysaccharides; Secretory structures; Taxonomy.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062017000300382
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Convection regime between canopy and air in a greenhouse Scientia Agricola
Atarassi,Roberto Terumi; Folegatti,Marcos Vinicius; Brasil,René Porfírio Camponez do.
The use of covering materials in protected environments modifies the air movement close to the crop canopy compared to external environment, which changes the heat and mass transfer between canopy and air. Several researches have been made in greenhouses to estimate mass and heat flux using dimensionless numbers to characterize the type of convection (forced, free or mixed). The knowledge of which one is dominant allows simplifications and specific approaches. The dominant convection regime between canopy and air was determined in a naturally ventilated greenhouse cropped with sweet pepper. Forced convection was predominant, representing more than 70% of the time. During daytime, an increase of mixed convection was observed. It is thus appropriated the use...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Heat flux; Leaf; Aerodynamic resistance.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000100012
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Diversity of metaxylem vessel elements in three Syagrus palms (Arecaceae) of different habits Acta Botanica
Pace,Marcelo Rodrigo; Botânico,Marli Pereira; Angyalossy,Veronica.
Vessel elements in Monocotyledons present morphological differences according to the organ where they occur. Usually such diff erences have been explained from an evolutionary perspective, with few data on how the vessel elements could be infl uenced by the diff erent functions of organs and the growth habits of the plants. To address this question, three vegetative organs of palms of the same genus, Syagrus, growing in similar environments, but with different habits, were analyzed. Accordingly, we aimed to detect whether the vessel elements would present similar features in all species or whether the vessel elements would change according to their different habits. We found that the width and type of perforation plates varied in the same way among all...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Monocotyledons; Tracheary elements; Vegetative organs; Growth habit; Root; Stem; Leaf.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062011000200007
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Doenças da folha do tomateiro que ocorrem no Pará. Infoteca-e
GONÇALVES, J. R..
bitstream/item/151942/1/FL02591.pdf
Tipo: Séries anteriores (INFOTECA-E) Palavras-chave: Aschochyta nycopersici; Cladosporim fulvum; Pará; Brasil; Tomato; Leaf; Disease.; Doença; Fungo; Mofo Cinzento; Queima da Folha; Tomate.; Amazonia; Fungi..
Ano: 1964 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/376717
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Effects of variety and plant spacing on weight, surface and yield of tobacco leaf (K326 and 347 Var.) CIGR Journal
Azadbakht, Mohsen; Ghajarjazi, Ehsan; Kiapei, Ali; Jafari, Hassan; Salehi, Ebrahim; Pishgar, Reza.
Tobacco is one of the important agricultural and industrial products which plays a crucial role in economics and income of the producing countries and tobacco’s leaves are actually used commercially. In this study, the effects of two tobacco varieties K326 and 347 in three plant spacing of 30, 40, and 50 cm (with density of 33333, 25000 and 20000 plants/ha) on physical properties and weight of tobacco leaves are discussed. The results of variance analysis showed that the ¬¬¬effects of variety and plant spacing on leaf surface in 5% level were significant. Interaction effect of these two factors wasn’t significant. Also results showed that independent and interaction effects of plant spacing and different varieties of tobacco on leaf weight were significant...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Tobacco; Plant spacing; Leaf; Weight; Yield.
Ano: 2016 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3646
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Forage productivity and morphogenesis of Axonopus aureus under different nitrogen fertilization rates R. Bras. Zootec.
Costa,Newton de Lucena; Moraes,Anibal de; Monteiro,Alda Lúcia Gomes; Motta,Antonio Carlos Vargas; Oliveira,Ricardo Augusto de; Rodrigues,Antonio Neri Azevedo.
The effect of nitrogen (N) fertilization (0, 50, 100 and 200 kg N ha-1) on forage yield and morphogenesis of Axonopus aureus was evaluated in the savannas of Roraima State, Brazil. The experimental design was in randomized blocks with three replicates. The grass showed high responsiveness to N fertilization. Dry weight (DW) yield, morphogenetic and structural traits and forage quality were positively affected by N fertilization. The effects of N fertilization on DW yield, N content, leaf appearance rate, leaf elongation rate, number of live leaves/tiller, final leaf length and leaf area index were quadratic and maximum values were estimated with application of 168.8 (2,181 kg ha-1); 124.8 (21.1 g/kg); 158.5 (0.163 leaf/day per tiller); 172.3 (2.75...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Dry weight; Leaf; Senescence; Tillering.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982013000800002
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Green ear yield and grain yield of maize cultivars in competition with weeds Planta Daninha
Silva,P.S.L.; Silva,K.M.B.; Silva,P.I.B.; Oliveira,V.R.; Ferreira,J.L.B..
The reduction in herbicide use is one of the greatest interests for modern agriculture and several alternatives are being investigated with this objective, including the adoption of cultivars that suppress weeds. The objective of this study was to verify if maize cultivars develop differently, in competition with weeds, to produce green ears and grain. Randomized complete block design was used, with split-plots and five replications. Cultivars DKB 390, DKB 466, DKB 350, AG 7000, AG 7575 and Master, were evaluated in the plots, without weeding and two weedings (at 22 and 41 days after sowing) in sub plots. Twenty-one species were identified in the experimental area, the most frequent being Gramineae (Poaceae), Euphorbiaceae, Leguminosae (Fabaceae) and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Zea mays; Green corn; Leaf; Root; Tolerance to weeds.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582010000100010
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Insetos Associados ao Enrolamento Foliar de Tabebuia spp. em Viveiros e na Arborização Urbana de Curitiba PFB - Pesquisa Florestal Brasileira
Santana, Dalva Luiz de Queiroz; Auer, Celso Garcia; Rocha, Ana Lucia Jarretta Loyola; Marques, Elaine.
Alguns ipês (Tabebuia alba, T. chrysotricha e T. heptaphylla) apresentam folhas jovens deformadas, na forma de enrolamento foliar, em viveiros e na arborização urbana. Uma avaliação foi feita em plantas destas espécies, com idade variando entre 1 mês e 3 anos, no Viveiro Municipal da Barreirinha e em árvores da arborização urbana da cidade de Curitiba, PR. Coletaram-se galhos apicais com sintomas, em cada planta, para a identificação dos insetos associados. Foram encontrados, associados às folhas  deformadas, insetos pertencentes às ordens Coleoptera, Hymenoptera, Hemiptera e Diptera. No entanto, foi constatado que o enrolamento do lombo foliar do ipê é  provocado por Trioza tabebuiae (Hemiptera: Psylloidea).
Tipo: Info:eu-repo/semantics/article Palavras-chave: Ipê-amarelo; Folha; Praga Trumpet tree; Leaf; Pest.
Ano: 2011 URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/245
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Insetos-pragas da batata e seu combate. Infoteca-e
MENSCHOY, A. B..
bitstream/item/126663/1/insetos-pragas-da-batata-e-seu-combate.pdf
Tipo: Séries anteriores (INFOTECA-E) Palavras-chave: Controle; Pest insects; Control; Leaf; Subsoils.; Batata; Folha; Inseto; Praga; Solanum Tuberosum; Subsolo.; Potatoes..
Ano: 1975 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/901170
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Intracellular and intercellular compartmentation of carbohydrate metabolism in leaves of temperate gramineae Rev. Bras. Bot.
POLLOCK,CHRISTOPHER J.; FARRAR,JOHN; KOROLEVA,OLGA A.; GALLAGHER,JOE A.; TOMOS,A. DERI.
This review considers the importance of compartmentation in the regulation of carbohydrate metabolism in leaves. We draw particular attention to the role of the vacuole as a site for storage of soluble sugars based on sucrose, and discuss briefly their characteristic metabolism. We also point out inconsistencies between the observed properties of vacuoles and the behaviour in vitro of the enzymes of fructan biosynthesis that do not support the hypothesis that the vacuole is the site of synthesis as well as of storage. We also consider compartmentation of carbohydrate metabolism between different cell types, using mainly our studies on leaves of temperate C3 gramineae. Here we present evidence of significant differences in carbon metabolism between...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Leaf; Carbohydrate; Compartmentation; Mesophyll; Vacuole.
Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042000000400001
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Leaf anatomy of rubber-tree clones Scientia Agricola
Martins,Maria Bernadete Gonçalves; Zieri,Rodrigo.
Rubber trees are easily recognizable for being woody, medium to large-sized plants, having a typical deciduous behavior, and especially because they produce latex. The purpose of this work was to study the anatomy and morphology of the leaf, comparing rubber tree &91;Hevea brasiliensis (Willd. ex Adr. de Juss.) Muell.-Arg.&93; clones (RRIM 600 and GT 1) grafted on the same root stock (Tjir 1), grown under the same climatic and soil conditions. This study allowed clones to be differentiated and also provided information on the location and disposition of laticifers in the leaf tissue. Cross sections of the mesophyll, center ribbing and petiole regions were made, followed by usual permanent histological blade methods. Biometric analyses of tissue...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Hevea brasiliensis; Leaf; Clones.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000400015
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Leaf-associated bacterial microbiota of coffee and its correlation with manganese and calcium levels on leaves Genet. Mol. Biol.
Sousa,Leandro Pio de; Silva,Marcio José da; Costa Mondego,Jorge Maurício.
Abstract Coffee is one of the most valuable agricultural commodities and the plants’ leaves are the primary site of infection for most coffee diseases, such as the devastating coffee leaf rust. Therefore, the use of bacterial microbiota that inhabits coffee leaves to fight infections could be an alternative agricultural method to protect against coffee diseases. Here, we report the leaf-associated bacteria in three coffee genotypes over the course of a year, with the aim to determine the diversity of bacterial microbiota. The results indicate a prevalence of Enterobacteriales in Coffea canephora, Pseudomonadales in C. arabica ‘Obatã’, and an intriguing lack of bacterial dominance in C. arabica ‘Catuaí’. Using PERMANOVA analyses, we assessed the association...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Coffee; Bacteria; 16S; Leaf; Manganese; Calcium.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572018000300455
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Morphology, Anatomy, Palynology and Seed Micromorphology of Turkish Endemic Verbascum exuberans Hub.-Mor. (Scrophulariaceae) Planta Daninha
AKTAS,K.; ÖZDEMIR,C.; ÖZDEMIR,B..
ABSTRACT: Verbascum L. is the largest genus of the family Scrophulariceae and includes several species are of medicinal importance. The high morphological diversity among the species of the genus Verbascum causes problems in the delimitation of the species. In this study, morphological, anatomical, palynological and seed properties of Verbascum exuberans were investigated. It is a local endemic restricted to the provinces of Manisa and Izmir in West Anatolia. In the root cross-section, the xylem elements occupy a considerable area. The upper part of the epidermis cells in the stem cross-section is covered a distinct cuticle layer. The main vein of the leaf is shapped as bicollateral bundle. Idioblasts were not observed in the epidermis of the leaves of V....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Leaf; Pollen; Root; Stem; Mullein.
Ano: 2020 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582020000100203
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Nitrogen and potassium supply and the morphogenic and productive characteristics of marandu palisadegrass R. Bras. Zootec.
Megda,Marcio Mahmoud; Monteiro,Francisco Antonio.
The objective of this work was to study morphogenic characteristics, and dry matter production of roots and shoots of marandu palisadegrass (Brachiaria brizantha cv. Marandu) submitted to combinations of nitrogen and potassium, in a nutritive solution, employing silica as substrate. The experiment was carried out in a greenhouse during the summer. It was used a 5² fractionated factorial scheme with 13 combinations of nitrogen and potassium, which were distributed in a randomized block design, with four replications. The nitrogen × potassium interaction was significant for the number of tillers and leaves, for leaf area, for shoots and root section dry mass, for total length and surface and specific length and surface in the roots. Production of aerial part...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Brachiaria brizantha; Leaf; Nutrient solution; Root; Shoot; Tiller.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010000800007
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Pasture height at the beginning of deferment as a determinant of signal grass structure and potential selectivity by cattle - doi: 10.4025/actascianimsci.v35i4.20421 Animal Sciences
Santos, Manoel Eduardo Rozalino; Universidade Federal de Uberlândia; Silveira, Márcia Cristina Teixeira; Empresa Brasileira de Pesquisa Agropecuária; Gomes, Virgílio Mesquita; Universidade Estadual de Montes Claros; Fonseca, Dilermando Miranda da; Universidade Federal de Viçosa; Sousa, Braulio Maia de Lana; Universidade Federal de Sergipe; Santos, Anselmo de Deus; Universidade Federal de Viçosa.
Current experiment identified the height of signal grass {Urochloa decumbens (Stapf) R. D. Webster cv. Basilisk [syn. Brachiaria decumbens Stapf cv. Basilisk]} at the beginning of deferment that provided an appropriate pasture structure and potential selectivity by cattle on deferred pastures. Four pasture heights at the beginning of deferment (10, 20, 30 and 40 cm) and two forage samples (available on pasture and simulated grazing) were studied. The experimental design was set in completely randomized blocks, with two replications, in a split-plot arrangement. Higher percentage of live leaf blades and lower percentage of live stems and senescent forage were recorded in the forage sample from simulated grazing. The increase in pasture height increased the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Brachiaria decumbens; Stem; Leaf; Senescent forage; Grazing Brachiaria decumbens; Stem; Leaf; Senescent forage; Grazing.
Ano: 2013 URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/20421
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Scanning electron microscopy of the leaf epidermis of Merostachys Spreng. (Poaceae: Bambusoideae) Acta Botanica
Gomes,Doria Maria Saiter; Neves,Léa de Jesus.
This study presents data on leaf micromorphology of 13 species of Merostachys Spreng. (Poaceae: Bambusoideae), a neotropical genus with numerous endemic species. Greatest species richness is found in Central and Southern Brazil, with 41 of the 46 species described. Species were collected in the field at the localities: Itatiaia National Park and Tijuca National Park, Rio de Janeiro State; Fontes do Ipiranga State Park, São Paulo state; Santa Teresa, Espírito Santo State and Rio Doce State Park, Minas Gerais State. Dried plant material came from the herbarium at the São Paulo Botany Institute. The presence of prickles, silica bodies and macro hairs may be especially useful in delimiting species.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Bamboo; Leaf; Merostachys; Poaceae; Scanning electron microscopy.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062009000200023
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Source correlation of biomarkers in a mangrove ecosystem on Santa Catarina Island in southern Brazil Anais da ABC (AABC)
Silva,Cesar A.; Madureira,Luiz A.S..
The relative distribution of several compounds identified in four samples of recently deposited sediments of the Itacorubi Mangrove located on the Santa Catarina Island, southern Brazil, was compared with similar data on compounds extracted from fresh leaves of three mangrove species (Avicennia schaueriana, the dominant species in the area, Rhizophora mangle and Laguncularia racemosa) and the Gramineae Spartinna alterniflora. Terpenols, previously identified in mangrove species in northern Brazil, were also found. A. schaueriana mainly contains β-amyrin (90.6 μg g-1 of extractable organic matter); low amounts of friedelin, betulin and germanicol were detected only in the leaf extract of this species. R. mangle also contained a significant amount of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Biomarkers; Leaf; Mangrove; Santa Catarina; Sediment.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000300002
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