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A study of chlorophyll-like and phycobilin pigments in the C endosymbiont of the apple- snail Pomacea canaliculata Biocell
Vega,Israel A.; Dellagnola,Federico A.; Hurst,Jorge A.; Godoy,Martín S.; Castro-Vazquez,Alfredo.
Pigments present in the brown-greenish C morph of an intracellular endosymbiont of Pomacea canaliculata were investigated. Acetone extracts of the endosymbiotic corpuscles showed an absorption spectrum similar to that of chlorophylls. Three fractions obtained from silica gel column chromatography of the acetone extracts (C I, C II and C III), were studied by positive ion fast atom bombardment-mass spectrometry (FAB-MS) and hydrogen-nuclear magnetic resonance (H-NMR). Results indicated the presence of (1) a sterol in the yellow colored C I fraction; (2) a mixture of pheophorbides a and b in the major green fraction, C II; and (3) a modified pheophorbide a in the smaller green fraction, C III. Aqueous extracts of the C endosymbiont did not show evidence of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Symbiosis; Cyanobacteria; Chloroplast; Photosynthetic pigments; Phylogeny.
Ano: 2012 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-95452012000200001
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Chlorophyll a fluorescence in saccharine sorghum irrigated with saline water AGRIAMBI
Monteiro,Danilo R.; Melo,Hidelblandi F. de; Lins,Cintia M. T.; Dourado,Pablo R. M.; Santos,Hugo R. B.; Souza,Edivan R. de.
ABSTRACT Soil salinity directly affects plants, interfering in the emission of fluorescence, and promoting the degradation of photosynthetic pigments. Thus, estimating the damage to the photosynthetic apparatus caused by saline water is an important tool to detect abiotic stresses. For this purpose, sorghum plants were cultivated in a greenhouse and irrigated with two water sources (NaCl and salt mixture) with six levels of electrical conductivity (EC) (0, 2.5, 5, 7.5, 10, and 12.5 dS m-1), forming a 6 × 2 factorial in randomized blocks with four repetitions. At 60 days after sowing, the photosynthetic pigments were quantified, the chlorophyll a fluorescence parameters (initial fluorescence [F0]; variable fluorescence [Fv]; maximum fluorescence [Fm];...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Salinity; Photosynthetic pigments; Photochemical efficiency.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018001000673
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Differences in morphological and physiological leaf characteristics between Tabebuia aurea and T. impetiginosa is related to their typical habitats of occurrence Acta Botanica
Capuzzo,Juliana Pfrimer; Rossatto,Davi Rodrigo; Franco,Augusto César.
The genus Tabebuia is representative of the Cerrado biome, occurring in savanna and forest formations. These vegetation types are associated with distinct environmental conditions in terms of water availability, microclimate and soil properties. We compared morphological and physiological traits between Tabebuia aurea (Silva Manso) Benth. & Hook. f. ex S. Moore, which is typical of the savanna vegetation, and T. impetiginosa (Mart. ex DC.) Standl, which is commonly found in the gallery forests that occur along streams and rivers. Both were sampled in savanna conditions under full sun. The savanna species had higher values of leaf and petiole thickness, specific leaf mass, maximum CO2 assimilation on a leaf area basis, stomatal conductance,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cerrado; CO2 assimilation; Leaf area; Photosynthetic pigments; Tabebuia.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062012000300002
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Ecophysiological adaptation and metal accumulation in water hyacinth from two tropical rivers Braz. J. Plant Physiol.
Vitória,Angela P.; Lage-Pinto,Frederico; Campaneli,Leonardo B.; Almeida,Marcelo G.; Souza,Cristina M. M.; Rezende,Carlos E.; Azevedo,Ricardo A.; Oliveira,Jurandi G..
The ecophysiological adaptations of water hyacinth (metal hyperaccumulator) under adverse environmental conditions are not yet clearly elucidated. This work evaluated photosynthetic pigments and chlorophyll a fluorescence in water hyacinth plants sampled in different regions (upper, middle and lower) of Paraíba do Sul river (PSR) and Imbé river, Brazil. Additionally Mn, Fe, Zn, Cu, Cr, Pb and Ni were quantified on the shoots and roots. Roots were the preferential site of metal accumulation. Cromium was not detected in the shoots. Iron and Mn were the elements detected in higher concentrations in all samples. Zinc and Cu were detected in higher concentrations in roots of plants from middle and upper PSR, sites of higher anthropogenic activity. The highest...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Pollution; Paraíba do Sul river; Energy dissipation; Photosynthetic pigments; Nonphotochemical quenchings.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202010000100006
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EFFECT OF FOLIAR APPLICATION OF AMINOACIDS ON PLANT YIELD AND SOME PHYSIOLOGICAL PARAMETERS IN BEAN PLANTS IRRIGATED WITH SEAWATER Acta biol.Colomb.
SH SADAK,Mervat; ABDELHAMID,Magdi T; SCHMIDHALTER,Urs.
Salinity decreases yield in arid and semi-arid areas. With increasing demand for irrigation water, alternative sources are being sought. Seawater salinity was previously considered unusable for irrigation. However, this water can be used successfully to grow crops under certain conditions. Amino acids is well known biostimulant which has positive effects on plant growth and yield, and significantly mitigates the injuries caused by abiotic stresses. Therefore, in the present study, the effect of exogenously treatment amino acid on faba bean plant growing under seawater salt stress was investigated. Reduction of salinity damage in faba bean by using a mixture of amino acids to improve morphological and biochemical parameters, and thus raising the level of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Free amino acids; Photosynthetic pigments; Proline; Salinity; Vicia faba.
Ano: 2015 URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2015000100015
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EFFECTS OF SILICON ON ALLEVIATING ARSENIC TOXICITY IN MAIZE PLANTS Rev. Bras. Ciênc. Solo
Silva,Airon José da; Nascimento,Clístenes Williams; Gouveia Neto,Artur da Silva; Silva Junior,Elias Arcanjo.
Arsenic is a metalloid highly toxic to plants and animals, causing reduced plant growth and various health problems for humans and animals. Silicon, however, has excelled in alleviating stress caused by toxic elements in plants. The aim of this study was to investigate the effects of Si in alleviating As stress in maize plants grown in a nutrient solution and evaluate the potential of the spectral emission parameters and the red fluorescence (Fr) and far-red fluorescence (FFr) ratio obtained in analysis of chlorophyll fluorescence in determination of this interaction. An experiment was carried out in a nutrient solution containing a toxic rate of As (68 μmol L-1) and six increasing rates of Si (0, 0.25, 0.5, 1.0, 1.5, and 2.0 mmol L-1). Dry matter...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Heavy metals; Metalloids; Photosynthetic pigments; Trace element.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832015000100289
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Estudo da eficiência de uso do nitrogênio em variedades locais e melhoradas de milho Rev. Bras. Bot.
MAJEROWICZ,NIDIA; PEREIRA,JOSÉ M.S.; MEDICI,LEONARDO O.; BISON,ODAIR; PEREIRA,MAURÍCIO B.; SANTOS JÚNIOR,ULYSSES M..
O uso de fertilizantes, além dos riscos de contaminação ambiental, onera o agricultor, chegando a representar 40% dos custos de produção na cultura do milho. O presente estudo visa identificar características fisiológicas relacionadas com o aumento da eficiência do uso do nitrogênio e assim subsidiar programas de melhoramento genético direcionados para obtenção de genótipos de milho produtivos em solos com baixa disponibilidade de nitrogênio. Foram estudadas as variedades de milho Pedra Dourada, Catetão, Carioca (variedades locais, não melhoradas), BR 106, BR 105 (variedades melhoradas em solos férteis), Nitroflint e Nitrodente (variedades melhoradas em solos pobres em N). Plântulas de milho receberam solução nutritiva de Hoagland modificada quanto às...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Nitrogen assimilation; Glutamine synthetase; Nitrate reductase; Photosynthetic pigments; Zea mays L..
Ano: 2002 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042002000200002
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Fisiología comparada de una línea celular clorofílica y una mutante amarilla del zacate Bouteloua gracilis (Kunth) Lag. ex Griffiths en condiciones de estrés osmótico. Colegio de Postgraduados
Jiménez Francisco, Betzaida.
Las suspensiones celulares clorofílicas de plantas superiores son una herramienta valiosa para estudiar las respuestas y señales a estrés hídrico asociadas con el cloroplasto. Debido a su importancia metabólica los cloroplastos actúan como sensores de los cambios ambientales y de las redes complejas de señales que coordinan las actividades celulares y ayudan a la célula durante el estrés. En el presente trabajo se realizó la caracterización fisiológica de dos líneas celulares en suspensión del zacate B. gracilis, que se caracterizan, una por ser altamente clorofílica y, la otra, una mutante deficiente de clorofila; se estudió el efecto de la deficiencia de clorofila en la respuesta al estrés osmótico mediante la evaluación de las relaciones hídricas,...
Palavras-chave: Estrés hídrico; ABA; Prolina; Biogénesis de cloroplasto; Biosíntesis de clorofila; Pigmentos fotosintéticos; Drought stress; Proline; Chloroplast biogenesis; Chlorophyll biosynthesis; Photosynthetic pigments; Botánica; Maestría.
Ano: 2013 URL: http://hdl.handle.net/10521/1976
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In vitro culture at low temperature and ex vitro acclimatization of Vriesea inflata an ornamental bromeliad Rev. Bras. Bot.
Pedroso,Andrea Nunes Vaz; Lazarini,Rosmari Aparecida de Morais; Tamaki,Vívian; Nievola,Catarina Carvalho.
(In vitro culture at low temperature and ex vitro acclimatization of Vriesea inflata an ornamental bromeliad). In vitro culture by seeds is a technique for preservation of threatened species because it may provide a large number of plants with genetic diversity. The bromeliad Vriesea inflata (Wawra) Wawra, an ornamental bromeliad, is extensively and illegally collected from the nature and must be preserved. It is possible to form plant threatened collections in vitro by reducing the temperature of culture, while occupying little space, with the consequent reduction of maintenance costs. This work evaluated the influence of temperature on in vitro growth and morphology of plants of V. inflata, with the aim of establishing a slow growth-rate and analyzing...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Anatomy; Bromeliaceae; Conservation; Growth; Photosynthetic pigments.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042010000300004
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Influence of light intensity on growth and physiological characteristics of common sage (Salvia officinalis L.) BABT
Zervoudakis,George; Salahas,George; Kaspiris,George; Konstantopoulou,Eleni.
The aim of this work was to investigate the effects of four different light intensities on the growth characteristics, physiological parameters and leaf photosynthetic pigments of Salvia officinalis L. The plant's dry mass, number of the leaves and physiological parameters indicated a strong positive correlation with the light intensity. On the other hand, the plant's height and leaf photosynthetic pigments were increased at low light treated plants. These results suggest that the aromatic herb Salvia officinalis L. is adaptable to different light environments.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Growth; Photosynthetic pigments; Physiological parameters; Salvia officinalis; Solar radiation.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132012000100011
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Isolation of new steroids of Kala Dhaman grass (Cenchrus setigerus) and evaluation of their bioactivity BABT
Singariya,Premlata; Kumar,Padma; Mourya,Krishan Kumar.
The present study was carried out to determine the possible bioactive components (steroids) of Cenchrus setigerus using GC-MS analysis and in vivo estimation of metabolites (total soluble sugar, soluble protein, proline and total phenolics), photosynthetic pigments (chlorophyll-a, chlorophyll-b and carotenoids) of seedlings and antimicrobial activity of extracts in various polar solvents from the leaves of C. setigerus. Antimicrobial activity was evaluated against three Gram-negative bacteria, including Proteusmirabilis, Klebsiella pneumonia and Agrobacterium tumefaciens andone fungus Aspergillus niger using 'disc diffusion' method, followed by the determination of minimum inhibitory concentrations (MIC) by broth dilution method. Results revealed the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cenchrus grass; Photosynthetic pigments; Total soluble sugar; Proline; Antibacterial activity; MIC; MBC/MFC.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132014000100010
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Portable chlorophyll meter for the quantification of photosynthetic pigments, nitrogen and the possible use for assessment of the photochemical process in Carica papaya L. Braz. J. Plant Physiol.
Torres Netto,Alena; Campostrini,Eliemar; Oliveira,Jurandi Gonçalves de; Yamanishi,Osvaldo Kiyoshi.
The techniques utilized to extract chlorophyll from plant materials are destructive and based on methods that use organic solvents. This study proposes the non-destructive quantification of chlorophyll and nitrogen concentration using a portable chlorophyll meter (SPAD-502). Further, was possible to establish relationships between chlorophyll fluorescence and SPAD-502 values. This methodology could save time, space and resources, and could be used for analysis of the photosynthetic processes. Papaya leaves (Solo and Formosa groups) of different ages were collected from 15-month-old plants cultivated in a commercial field in São Francisco de Itabapoana, Rio de Janeiro State (41(0):15W; 21(0):27S). Correlations were established between the chlorophyll...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Nutrient content; Photosynthetic pigments; SPAD-502.
Ano: 2002 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202002000300004
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Repartition de la chlorophylle a dans l'etang de Thau: Richesse nutritive pour les mollusques d'elevage ArchiMer
Tournier, Henri; Pichot, Yves.
This study concerns the determination of phytoplanktonic pigment concentrations in the lagoon of Thau at 14 sampling stations which were surveyed 36 times during 1986. The evolution of the main pigment chlorophyll a)is described for the whole year. The object of this work is to determine if the phytoplanktonic pigment abundance is related to the nutritive richness of the lagoon water where oysters and mussels are bred.
Tipo: Text Palavras-chave: Oyster culture; Mussel; Nutritive value; Photosynthetic pigments; Chlorophylls.
Ano: 1985 URL: http://archimer.ifremer.fr/doc/1985/publication-1762.pdf
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Response of Cucumis sativus L. seedlings to Pb exposure Braz. J. Plant Physiol.
Gonçalves,Jamile F.; Becker,Alexssandro G.; Pereira,Luciane B.; Rocha,João B. T. da; Cargnelutti,Denise; Tabaldi,Luciane A.; Battisti,Vanessa; Farias,Júlia G.; Fiorenza,Amanda M.; Flores,Érico M. M.; Nicoloso,Fernando T.; Schetinger,Maria R. C..
In this study, the effects of lead (Pb) on growth, photosynthetic pigments concentration, lipid peroxidation, electrolyte leakage percentage (ELP), protein oxidation, aminolevulinate dehydratase (ALA-D; E.C. 4.2.1.24), ascorbate peroxidase (APX; E.C. 1.11.1.11), catalase (CAT; E.C. 1.11.1.6) and superoxide dismutase (SOD; E.C. 1.15.1.1) activities, and ascorbic acid (AsA), non-protein thiol groups (NPSH) and total soluble protein concentrations in cucumber seedlings (Cucumis sativus L.) were investigated. Seedlings were grown in vitro in an agar-solidified substrate containing three Pb levels as (C2H3O2)Pb.3H2O (0, 100, 400, and 1000 µmol L-1) for 10 d. Increasing Pb concentrations in substrate enhanced Pb concentration in both roots and shoot. Pb...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Antioxidant enzymes; Cucumber; Lipid peroxidation; Pb; Photosynthetic pigments; Protein oxidation.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202009000300002
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Short-term interactions between phytoplankton and intertidal seagrass vegetation in a coastal lagoon (Bassin d'Arcachon, SW France) ArchiMer
De Wit, Rutger; Troussellier, Marc; Courties, Claude; Buffan-dubau, Evelyne; Lemaire, Emmanuelle.
We experimentally simulated the temporality of the interactions between intertidal seagrasses and phytoplankton in the context of nutrient enrichment from continental origin. Phytoplankton development was retarded after 1-day exposure to intertidal Zostera noltii Hornemann vegetation samples, with respect to control treatments. This was not explained by resource competition and we hypothesized a direct interference between seagrass leaves and phytoplankton. After separation from the vegetation in 5-day incubations, the final yield of large phytoplankton, mainly diatoms and haptophytes, was determined by nutrient loading. In contrast, Synechococcus-like cells (SYN), phototrophic picoeukaryotes and nanophytoplankton decreased after day 3, most likely due to...
Tipo: Text Palavras-chave: Competition; Allelopathy; Zostera noltii; Sediment; Intertidal vegetation; Flow cytometry; Photosynthetic pigments.
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00106/21717/19414.pdf
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Structural and ecophysiological alterations of the water hyacinth [Eichhornia crassipes (Mart.) Solms] due to anthropogenic stress in Brazilian rivers BABT
Vitória,Angela Pierre; Lage-Pinto,Frederico; Silva,Leonardo Bernardo Campaneli da; Cunha,Maura da; Oliveira,Jurandi Gonçalves de; Rezende,Carlos Eduardo; Souza,Cristina Maria Magalhães de; Azevedo,Ricardo Antunes.
In this work, the structural and ecophysiological alterations (chlorophyll a fluorescence and photosynthetic pigments), and quantification of Cr, Pb and Zn in the leaf limb, petiole and younger and older roots of water hyacinth from the lower, medium and upper Paraíba do Sul river (PSR) and Imbé river were evaluated. The plants from the medium and upper PSR (more industrialized and populated regions) exhibited lower turgid cell in the root cortex, less root hairs and leaf epidermis, chloroplasts with plastoglobules and increased stroma volume. Higher concentrations of metals were observed in the younger and older roots from the medium PSR plants. The results suggested that the plants from more anthropized regions were able to maintain the maximum quantum...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Chlorophyll a fluorescence; Photosynthetic pigments; Energy dissipation; Morphological alterations; Metal evaluate.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132011000500025
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Suivi de quelques facteurs environnementaux dans les pertuis Charentais : de 1992 à 1994 ArchiMer
Arnaud, Christophe.
A study of the environmental factors in the "pertuis charentais" (charentais straits) has been carried out from 1993 tc 1994. The evolution of water temperature and salinity, as weil as the turbidity, are studied. ln the middle of Breton Strait, near to the long lines, the stratification has not been observed, and the salinity variations are much less sharp than in the stations which are located nearer the coast. The photosynthetic pigments concentrations can be very different in the same time at two close stations; in the Antioch Strait and at the long lines, the values of chlorophyll "a" are comparable; they are much higher in the Breton Strait. At the same time, a study has been made on the physical factors, the photosynthetic pigments concentrations,...
Tipo: Text Palavras-chave: Pertuis charentais; Facteurs physico-chimiques; Turbidité; Pigments chlorophylliens; Seston; "pertuis charentais"; Physical factors; Turbidity; Photosynthetic pigments; Seston..
Ano: 1995 URL: http://archimer.ifremer.fr/doc/00082/19282/16877.pdf
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TEMPORAL VARIATION AND SPATIAL DISTRIBUTION OF RELATIVE INDICES OF LEAF CHLOROPHYLL IN GRAPEVINE cv. CHARDONNAY REA
Costa,Bruno R. S.; Oldoni,Henrique; Silva,Wendell A.; Martins,Roberto L.; Bassoi,Luís H..
ABSTRACT Variation in the spatial distribution of leaf chlorophyll content associated with the progression of the phenological cycle of crops may occur in cultivated areas as a result of the variability of environmental conditions and of the intrinsic properties of the plants. The objective of the present study was to model the trend in variation and assess the temporal stability of index of chlorophyll a, b, and total chlorophyll (Chla, Chlb, and Chlt, respectively), and to characterize the spatial distribution of Chlt index in grapevine cv. ‘Chardonnay’. The assessments consisted of in situ measurements made with a portable meter in a commercial vineyard located in the municipality of Espírito Santo do Pinhal, state of São Paulo, Brazil, in the period...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Vitis vinifera L.; Photosynthetic pigments; Portable meter.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162019000800074
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The effect of chilling on the photosynthetic activity in coffee (Coffea arabica L.) seedlings: The protective action of chloroplastid pigments Braz. J. Plant Physiol.
Oliveira,Jurandi Gonçalves de; Alves,Pedro Luis C.A.; Magalhães,Antonio Celso.
Coffea arabica is considered to be sensitive to low temperatures, being affected throughout its entire life cycle. Injury caused by chilling (low temperatures above zero degree centigrade) is characterized primarily by inhibition of the photosynthetic process. The objective of this work was to evaluate the role of photosynthetic pigments in the tolerance of coffee (C. arabica L.) seedlings to chilling. The evaluation the photosynthetic activity was made by emission of Chl a fluorescence at room temperature (25 ºC) in vivo and in situ, using a portable fluorometer. The pigment content was obtained by extraction with 80 % acetone, while estimation of membrane lipid peroxidation was determined by measuring the MDA content in leaf tissue extracts. The results...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Chlorophyll a fluorescence; Coffee; Lipid peroxidation; Photosynthetic pigments.
Ano: 2002 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202002000200003
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Water-deficit tolerant classification in mutant lines of indica rice Scientia Agricola
Cha-um,Suriyan; Yooyongwech,Suravoot; Supaibulwatana,Kanyaratt.
Water shortage is a major abiotic stress for crop production worldwide, limiting the productivity of crop species, especially in dry-land agricultural areas. This investigation aimed to classify the water-deficit tolerance in mutant rice (Oryza sativa L. spp. indica) genotypes during the reproductive stage. Proline content in the flag leaf of mutant lines increased when plants were subjected to water deficit. Relative water content (RWC) in the flag leaf of different mutant lines dropped in relation to water deficit stress. A decrease RWC was positively related to chlorophyll a degradation. Chlorophyll a , chlorophyll b , total chlorophyll , total carotenoids , maximum quantum yield of PSII , stomatal conductance , transpiration rate and water use...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Ward cluster analysis; Drought tolerance; Fertile grain; Photosynthetic pigments; Water relation.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000200008
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