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Chlorophyll a fluorescence and leaf temperature are early indicators of oil palm diseases Scientia Agricola
Aucique-Perez,Carlos Eduardo; Daza,Edison Steve; Ávila-Diazgranados,Rodrigo Andrés; Romero,Hernán Mauricio.
ABSTRACT Bud rot (BR) caused by Phytophthora palmivora and lethal wilt (LW) whose causal agent is unknown, are two diseases currently posing a threat to the oil palm ( Elaeis guineensis . Jacq) industry. BR, first reported in 1964, has destroyed more than 85,000 ha. LW, first reported in 1994 in the Llanos Orientales in Colombia, has destroyed more than 5,000 ha. Chlorophyll a fluorescence is useful as a provider of information about the efficiency of the photosynthetic process when plants are subjected to biotic or abiotic stresses. Oil palms affected by BR and LW showed anomalies in the photosynthetic system, manifested by reductions in Fv / F M and ΦPSII. Changes in ΦPSII, variable fluorescence yield ( Fv ) and maximum fluorescence in light-adapted...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Photosystem II; PSII quantum efficiency; Plant-Pathogen Interaction; Severity.
Ano: 2020 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000201201
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Chlorophyll fluorescence parameters as indicators of submergence tolerance in rice International Rice Research Institute
Sarkar, R. K.; Panda, D.; Rao, D. N..
p.66-68
Palavras-chave: Chlorophyll; Fluorescence; Submergence; Tolerance; Red light; Photosystem II; Photosynthesis; Electron transfer; Cultivars.
Ano: 2004 URL: http://hdl.handle.net/123456789/862
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Clorofila A em genótipos de amendoim sob déficit hídrico e inoculados com rizóbios. Repositório Alice
BARBOSA, D. D.; LIMA, L. M. de.
O amendoim é uma leguminosa de importância econômica cultivada em várias regiões do Brasil e possui grande capacidade de adaptação ambiental. Apesar disso, a seca é um fator ambiental que afeta a capacidade de produção da cultura, principalmente em regiões semiáridas, causando impactos econômicos negativos. Objetivou-se avaliar a fluorescência da clorofila a em plantas de amendoim submetidas a déficit hídrico e inoculadas com rizóbios. O experimento foi realizado em casa de vegetação na Embrapa Algodão em Campina Grande-PB. Utilizou-se três genótipos de amendoim (CNPA 76 AM, 2012-4 e BRS Havana) e para tais foram aplicados os seguintes tratamentos, dois isolados de rizóbios (SEMIA 6144 e ESA 123), uma fonte química nitrogenada (sulfato de amônia) e o...
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Fluorescência; Fotossistema II; Rendimento quântico; Rihizobium; Seca; Rhizobium; Fluorescence; Photosystem II; Rhizobium.
Ano: 2016 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1064779
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Copper Stress on Photosynthesis of Black Mangle (Avicennia germinans) Anais da ABC (AABC)
GONZALEZ-MENDOZA,DANIEL; GIL,FRANCISCO ESPADAS y; ESCOBOZA-GARCIA,FERNANDO; SANTAMARIA,JORGE M.; ZAPATA-PEREZ,OMAR.
The effects of copper toxicity on the photosynthetic activities of Avicennia germinans was investigated using two CuSO4 concentrations (0.062 and 0.33 M) added in Hoagland's solution in an aerated hydroponic system. Photosynthesis and chlorophyll fluorescence were measured after 30 h of copper stress. Results obtained in this study show that increasing levels of Cu+2 of 0.062 and 0.33 M Cu+2 resulted in a general reduction of the stomatal conductance (28 and 18%, respectively) and 100% of inhibition of net photosynthesis. Additionally, at these concentrations of Cu+2, reductions of chlorophyll fluorescence parameters were also observed. These changes suggested that the photosynthetic apparatus of Avicennia germinans was the primary target of the Cu+2...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Avicennia germinans; Chlorophyll fluorescence; Copper; Photosystem II; Photosynthesis.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000200665
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Crescimento vegetativo, resistência estomática, eficiência fotossintética e rendimento do fruto da melancieira em diferentes níveis de água - DOI: 10.4025/actasciagron.v32i1.2136 Agronomy
Melo, Alberto Soares de; UEPB; Suassuna, Janivan Fernandes; UEPB; Fernandes, Pedro Dantas; UFCG; Brito, Marcos Eric Barbosa; UFCG; Suassuna, Antonio Fernandes; UEPB; Aguiar Netto, Antenor Oliveira; UFS.
Objetivou-se avaliar diferentes regimes hídricos sobre o comportamento morfofisiológico e o rendimento da melancieira em condições de campo no semiárido paraibano. O experimento foi realizado no Setor Experimental da Universidade Estadual da Paraíba, localizado em Catolé do Rocha (PB). Utilizou-se a cultivar Crimson Sweet espaçada de 2,2 m x 0,6 m, no delineamento em blocos ao acaso com quatro tratamentos [40, 70, 100 e 130% da evapotranspiração de referência (mm dia-1)] e oito repetições. As máximas expressões de crescimento foram verificadas na lâmina de água de 204 mm, com área foliar de 1,831 m2, índice de área foliar de 1,35 m2 m-2 e taxa de crescimento de 0,04 m2 dia-1. A resistência estomática foi maior à tarde, independentemente da lâmina de água....
Tipo: Pesquisa experimental Palavras-chave: 5.01.00.00-9 Agronomia Citrullus lanatus Thumb. Mansf.; Transpiração; Irrigação; Fotossistema II 5.01.03.00-8 Citrullus lanatus Thumb. Mansf.; Transpiration; Irrigation; Photosystem II.
Ano: 2010 URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/2136
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Effect of cadmium on young plants of Virola surinamensis. Repositório Alice
ANDRADE JÚNIOR, W. V.; OLIVEIRA NETO, C. F. de; SANTOS FILHO, B. G. dos; AMARANTE, C. B. do; CRUZ, E. D.; OKUMURA, R. S.; BARBOSA, A. V. C.; SOUSA, D. J. P. de; TEIXEIRA, J. S. S.; BOTELHO, A. de S..
The steady increase in cadmium (Cd) levels in the environment from anthropogenic actions has contributed to environmental degradation. Virola surinamensis is a forest species that has desirable characteristics such as deep and dense roots, relatively rapid growth and high biomass production to remedy contaminated environments by Cd. The aim of this study was to assess the physiological responses and the phytoextraction and tolerance capacity of young plants of V. surinamensis submitted to Cd concentrations. The experimental design was a completely randomized design with five Cd concentrations (0, 15, 30, 45 and 60 mg L−1) for 60 days. Leaf water potential (Ψpd), stomatal conductance (gs) and transpiration (E) reduced in plants exposed to...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Virola Surinamensis; Cadmium; Photosystem II.
Ano: 2019 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1117176
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Inhibition of the water splitting system by sodium chloride stress in the green alga Chlorella vulgari Braz. J. Plant Physiol.
EL-Sheekh,Mostafa M..
The effect of sodium chloride on the photosynthetic electron transport chain was investigated in the freshwater green alga Chlorella vulgaris. It was found that the rate of oxygen evolution under steady state and flash light conditions diminished by increasing salt concentrations. Salt treatment of cells also decreased the fluorescence and delayed luminescence yields. However, the fluorescence yield was almost completely restored by the addition of an artificial electron donor to the NaCl-treated cells. The oscillation pattern of the thermoluminescence B band as a function of flash number indicated that the S2<FONT FACE=Symbol>®</FONT>S3 transition of the water splitting system is inhibited by NaCl treatment.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Chlorella; Electron transport; Photosystem II; Salinity.
Ano: 2004 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202004000100004
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Metabolic alterations and X-ray chlorophyll fluorescence for the early detection of lead stress in castor bean (Ricinus communis) plants Agronomy
Nascimento, Clístenes Williams Araújo do; Marques, Marise Conceição.
 The remediation of lead-contaminated areas poses a serious challenge to soil chemists because Pb has low solubility in soil. Thus, Pb phytostabilization is considered to be an attractive remediation technique. Castor bean (Ricinus communis) is an oilseed crop known for its tolerance to heavy metals, and our aim was to assess the early detection of Pb toxicity and the effects of Pb on the biomass, photosynthetic pigments, antioxidative enzyme activities, and total soluble proteins of this plant. Specimens were grown in a nutrient solution spiked with Pb concentrations of 25, 50, 100, 150, or 200 µmol L-1. A control without Pb was also grown. The results show that X-ray chlorophyll fluorescence is an efficient technique for the early detection of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Tolerance; Oilseed crop; Photosystem II; Fr/FFr ratios..
Ano: 2018 URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/39392
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Metabolic alterations and X-ray chlorophyll fluorescence for the early detection of lead stress in castor bean (Ricinus communis) plants Agronomy
Nascimento, Clístenes Williams Araújo do; Marques, Marise Conceição.
 The remediation of lead-contaminated areas poses a serious challenge to soil chemists because Pb has low solubility in soil. Thus, Pb phytostabilization is considered to be an attractive remediation technique. Castor bean (Ricinus communis) is an oilseed crop known for its tolerance to heavy metals, and our aim was to assess the early detection of Pb toxicity and the effects of Pb on the biomass, photosynthetic pigments, antioxidative enzyme activities, and total soluble proteins of this plant. Specimens were grown in a nutrient solution spiked with Pb concentrations of 25, 50, 100, 150, or 200 µmol L-1. A control without Pb was also grown. The results show that X-ray chlorophyll fluorescence is an efficient technique for the early detection of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Tolerance; Oilseed crop; Photosystem II; Fr/FFr ratios..
Ano: 2018 URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/39392
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Mixture of glufosinate and atrazine for ryegrass (Lolium multiflorum Lam.) control and its effect on seeds' quality. Repositório Alice
ULGUIM, A. da R.; AGOSTINETTO, D.; VARGAS, L.; SILVA, J. D. G. da; SCHNEIDER, T.; SILVA, B. M. da.
bitstream/item/203314/1/ID44702-2019v72n1p8655RevFacNacAgron.pdf
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Ryegrass; Lolium Multiflorum; Azevém; Photosystem II; Glutamine; Glufosinate; Atrazine.
Ano: 2019 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1113348
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Multiple resistance to atrazine and imazethapyr in hairy beggarticks (Bidens pilosa ) Ciência e Agrotecnologia
Takano,Hudson Kagueyama; Oliveira Junior,Rubem Silvério de; Constantin,Jamil; Braz,Guilherme Braga Pereira; Franchini,Luiz Henrique Morais; Burgos,Nilda Roma.
ABSTRACT Resistance to herbicides is a serious threat to crop production worldwide, especially in agronomic crops and cereals. This research evaluated the possible occurrence of Bidens pilosa resistant to imazethapyr and atrazine in Brazil. The resistant biotype was collected from an area with a history of repeated application of photosystem II (PSII) and ALS inhibitor herbicides. The susceptible biotype was collected from an area with no history of herbicide application. Resistance verification experiments were carried out in the greenhouse. The treatments were arranged in a 3 x 8 factorial scheme, where the first factor was populations [susceptible (S), parent resistant (PR), and resistant F1 (RF1)]; and the second factor was herbicide dose (0, 375, 750,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Photosystem II; Resistance level; Herbicide resistance.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542016000500547
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Physiological analysis of leaf senescence of two rice cultivars with different yield potential PAB
Falqueto,Antelmo Ralph; Cassol,Daniela; Magalhães Júnior,Ariano Martins de; Oliveira,Antônio Costa de; Bacarin,Marcos Antonio.
The objective of this work was to evaluate the physiological changes that occur in different leaves during the early and late grain-filling stages of two rice genotypes (Oryza sativa subsp. indica , BRS Pelota cultivar, and O. sativa subsp. japonica , BRS Firmeza cultivar), which present differences in grain yield potential. The plants were cultivated in greenhouse. Pigment content, chlorophyll fluorescence, electron transport and oxygen evolution rate were determined in the grain-filling stage, from the first to the forth leaf (top to bottom). Pigment content, photochemical efficiency of photosystem II and electron transport decreased significantly according to the position of leaves in 'BRS Pelota'. The BRS Firmeza cultivar shows higher pigment content...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Oryza sativa; Oxygen evolution rate; Photochemical quenching; Photosystem II; Photochemicol efficiency; Stay green.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2009000700007
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Physiological changes and in the carbohydrate content of sunflower plants submitted to sub-doses of glyphosate and trinexapac-ethyl Bragantia
Vital,Roberto Gomes; Jakelaitis,Adriano; Silva,Fábia Barbosa; Batista,Priscila Ferreira; Almeida,Gabriel Martins; Costa,Alan Carlos; Rodrigues,Arthur Almeida.
ABSTRACT The maturing of drift used in the culture of sugar cane can have harmful effects on other crops grown in the vicinity of sugar cane plantations. Among these, sunflower grown in the off-season can have its growth and productivity affected by drift. The objective of this research was to evaluate whether the drift of trinexapac-ethyl and glyphosate promotes changes in the photosynthetic metabolism of sunflower plants. Two trials were carried out to evaluate the effects of these products on gas exchange, chlorophyll fluorescence, chloroplastid pigments, membrane permeability, sugar content, as well as shikimic acid and malondialdehyde concentration in the treated plants. In the first experiment, we tested glyphosate in doses of 0 (control); 3.6; 7.2;...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Gibberellin; EPSPs; Photosystem II; Photochemical efficiency.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052017000100033
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Salt stress change chlorophyll fluorescence in mango Rev. Bras. Frutic.
Lucena,Cicero Cartaxo de; Siqueira,Dalmo Lopes de; Martinez,Hermínia Emilia Prieto; Cecon,Paulo Roberto.
This study evaluated the tolerance of mango cultivars 'Haden', 'Palmer', 'Tommy Atkins' and 'Uba' grafted on rootstock 'Imbú' to salt stress using chlorophyll fluorescence. Plants were grown in modified Hoagland solution containing 0, 15, 30, and 45 mmol L-1 NaCl. At 97 days the parameters of the chlorophyll fluorescence (F0, Fm, Fv, F0/Fm, Fv/Fm, Fv'/Fm', ΦPSII = [(Fm'-Fs)/(Fm')], D = (1- Fv'/Fm') and ETR = (ΦPSII×PPF×0,84×0,5) were determined. At 100 days, the leaf emission and leaf area, toxicity and leaf abscission indexes were determined. In all cultivars evaluated, in different degree, there were decreases in photochemical efficiency of photosystem II, enhanced concentrations from 15 mmol L-1 NaCl. The decreases in the potential quantum yield of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Mangifera indica L.; Photosystem II; Vegetative growth; Salt stress.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452012000400034
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