Photochemical efficiency in bean plants (Phaseolus vulgaris L. and Vigna unguiculata L. Walp) during recovery from high temperature stress

Costa, Ernany Santos; Bressan-Smith, Ricardo; Oliveira, Jurandi Gonçalves de; Campostrini, Eliemar; Pimentel, Carlos

doi:10.1590/s1677-04202002000200004

Cited by 22 publications

(22 citation statements)

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“…An increase in F 0 (and a decrease in Fv/ Fm) has been attributed to the physical separation of PS II RC from their associated pigment antenna resulting in blocked energy transfer of the PS II traps, although a part of this phenomenon could possibly reflect the accumulation of the reduced form of Q A¯. In this study F 0 was used as indicator for damage in PS II, associated to LHC II dissociation and blocking the electron transfer in the reductant side of PS II (Costa et al 2002). M 0 showed its maximal rate at 11 AM and 1 PM when Q A¯r eoxidation is inhibited.…”

Section: Resultsmentioning

confidence: 95%

Alterations in photochemical efficiency of photosystem II in wheat plant on hot summer day

Mathur

Jajoo

2014

Physiol Mol Biol Plants

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In this study the effect of increasing temperature on photochemical efficiency of PS II in wheat plants has been studied on a hot summer day (9:00 AM (Control)-7:00 PM) by measuring Chl a fluorescence. Increasing temperature for a short period of time (2-4 h), in nature affects the efficiency of PS II complex reversibly and does not cause permanent damage to any of the components of photosystem II. A scheme has been provided to demonstrate the sequence and severity of events which get affected maximum by temperature stress.

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Section: Resultsmentioning

confidence: 95%

Alterations in photochemical efficiency of photosystem II in wheat plant on hot summer day

Mathur

Jajoo

2014

Physiol Mol Biol Plants

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“…The photochemical activity is also affected by environmental stresses (Van Kooten & Snel, 1990;Maxwell & Johnson, 2000), such as high temperature (Yamane et al, 1997;Costa et al, 2002). Photochemical reactions are linked to the CO 2 fixation process by supplying ATP and NADPH, and are also regulated by alternative electron sinks, such as photorespiration, Mehler reaction and nitrogen reduction (Champigny, 1995;Cornic & Fresneau, 2002;Noctor et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

“…In addition to the effect of high temperature (Pastenes & Horton, 1996b;Yamane et al, 1997;Pastenes & Horton, 1999), the photochemical apparatus may also be influenced by high light intensity (Long et al, 1994;Osmond, 1994;Critchley, 1998), which frequently occurs around noon when air temperature and vapor pressure deficit are elevated. Concerning the effects of elevated air temperature in bean plants, Pastenes & Horton (1996b) and Costa et al (2002) observed that the susceptibility of photosynthetic apparatus depends on studied genotype. Therefore, bean cultivars show different physiological responses when submitted to the same changes in air temperature and vapor pressure deficit.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, bean cultivars show different physiological responses when submitted to the same changes in air temperature and vapor pressure deficit. In fact, these responses permit genotypes to avoid or tolerate high temperature effects, allowing plants to maintain adequate or reasonable photosynthetic rates (Pastenes & Horton, 1996a, 1996b, 1999Costa et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

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Environmental effects on photosynthetic capacity of bean genotypes

Ribeiro

Santos

Souza

et al. 2004

Pesq. agropec. bras.

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-Photosynthetic responses to daily environmental changes were studied in bean (Phaseolus vulgaris L.) genotypes 'Carioca', 'Ouro Negro', and Guarumbé. Light response curves of CO 2 assimilation and stomatal conductance (g s ) were also evaluated under controlled (optimum) environmental condition. Under this condition, CO 2 assimilation of 'Carioca' was not saturated at 2,000 1mol m -2 s -1 , whereas Guarumbé and 'Ouro Negro' exhibited different levels of light saturation. All genotypes showed dynamic photoinhibition and reversible increase in the minimum chlorophyll fluorescence yield under natural condition, as well as lower photosynthetic capacity when compared with optimum environmental condition. Since differences in g s were not observed between natural and controlled conditions for Guarumbé and 'Ouro Negro', the lower photosynthetic capacity of these genotypes under natural condition seems to be caused by high temperature effects on biochemical reactions, as suggested by increased alternative electron sinks. The highest g s values of 'Carioca' were observed at controlled condition, providing evidences that reduction of photosynthetic capacity at natural condition was due to low g s in addition to the high temperature effects on the photosynthetic apparatus. 'Carioca' exhibited the highest photosynthetic rates under optimum environmental condition, and was more affected by daily changes of air temperature and leaf-to-air vapor pressure difference.Index terms: Phaseolus vulgaris, chlorophyll fluorescence, gas exchange, photosynthesis. Efeitos ambientais na capacidade fotossintética de genótipos de feijoeiroResumo -Foram avaliadas as respostas fotossintéticas às variações diárias do ambiente nos genótipos de feijoeiro (Phaseolus vulgaris L.) 'Carioca', 'Ouro Negro' e Guarumbé. Curvas de resposta da assimilação de CO 2 e condutância estomática (g s ) à luz foram realizadas em condição ambiental controlada (ótima). Nessa condição a assimilação de CO 2 de 'Carioca' não foi saturada mesmo a 2.000 1mol m -2 s -1 , enquanto Guarumbé e 'Ouro Negro' apresentaram diferentes níveis de saturação lumínica. Os genótipos mostraram fotoinibição dinâmica e aumento reversível da fluorescência mínima da clorofila em condição natural, assim como menor capacidade fotosintética quando comparada à sob condição controlada. Uma vez que Guarumbé e 'Ouro Negro' apresentaram valores similares de g s em ambas condições ambientais, a menor capacidade fotossintética desses genótipos sob condição natural parece ser causada pelos efeitos da alta temperatura nas reações bioquímicas, como sugerido pelo aumento dos drenos alternativos de elétrons. Os maiores valores de g s em 'Carioca' foram observados em condição controlada, podendo a redução da capacidade fotossintética em condição natural ser atribuída aos baixos valores de g s em adição aos efeitos da alta temperatura no aparato fotossintético. 'Carioca' exibiu as maiores taxas fotossintéticas em condições ambientais ótimas, sendo mais afetado pelas mudanças diárias de temperatura...

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“…Altas temperaturas podem afetar direta e indiretamente as trocas gasosas, tanto por promover alterações na condutância estomática, quanto pelo fato de provocar mudanças e desarranjo no aparato fotossintético, causando estresse (MAXWELL; JOHNSON, 2000;COSTA et al, 2002;RIBEIRO et al, 2004;SAGE;KUBIEN, 2007). Segundo Wise et al (2004), danos diretos ao aparato fotossintético podem ser ocasionados por altas temperaturas por provocarem alterações nas membranas dos tilacoides, alterando a organização estrutural e as propriedades físico-químicas.…”

Section: Introductionunclassified

Trocas Gasosas De Plantas Jovens De Taxi-Branco Submetidas À Variação De Temperatura Foliar E Suspensão Da Irrigação

Morais¹,

Rossi²,

Higa³

2017

Ciênc. Florest.

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RESUMOO objetivo deste trabalho foi investigar a influência da variação de temperatura foliar associada à suspensão de irrigação sobre as trocas gasosas de plantas jovens de taxi-branco (Sclerolobium paniculatum Vogel). O estudo foi realizado em casa de vegetação na área experimental da Embrapa Amazônia Ocidental. As plantas cresceram em casa de vegetação e depois de quatro meses de aclimatização foram submetidas a três regimes hídricos (mantidas irrigadas até a capacidade de campo do solo, irrigação suspensa por oito e 14 dias). Foram avaliados os parâmetros fisiológicos de trocas gasosas, taxa de assimilação líquida de CO 2 (A), transpiração foliar (E), condutância estomática (g s ) e eficiência no uso da água (EUA) os quais foram obtidos por meio do medidor portátil de fotossíntese (CI-340, CID, Inc.). Os resultados mostraram que houve redução das taxas de assimilação líquida de CO 2 em função da elevação da temperatura foliar e da suspensão da irrigação. Após oito dias de suspensão da irrigação houve redução das taxas de assimilação líquida de CO 2 fotossintéticas em 62, 65, 75, 58, 50 e 64% e aos 14 dias esta redução foi de 80, 85, 85, 84, 86 e 93% em comparação as plantas mantidas irrigadas, nas temperaturas de 25, 30, 35, 40, 45 e 50°C, respectivamente. O comportamento das taxas de transpiração foliar foi inversamente proporcional às taxas de fotossíntese líquida, mostrando incremento em função do aumento da temperatura foliar. O comportamento fisiológico de trocas gasosas de Sclerolobium paniculatum apresentou variações tanto em relação ao efeito da temperatura foliar, quanto da suspensão de irrigação. Palavras-chave: Sclerolobium paniculatum; fotossíntese; estresse hídrico. ABSTRACTThe study aimed to investigate the influence of leaf temperature variation associated with irrigation suspension on gas exchange of seedlings of Sclerolobium paniculatum Vogel. The study was carried out in a greenhouse at experimental area of Embrapa, Amazônia Ocidental. Plants were grown in a greenhouse and, after four months were subjected to three treatments (irrigated maintained until the field capacity, irrigation suspended for eight and 14 days). We evaluated the physiological parameters of gas exchange, net assimilation rate of CO 2 (A), leaf transpiration (E), stomatal conductance (g s ) and water use efficiency (WUE) which were obtained through a photosynthesis portable meter (CI-340, CID, Inc). The results showed reduction of net assimilation rate of CO 2 depending on the elevation of the leaf temperature and without irrigation. After eight days without irrigation, decreased rates of photosynthetic assimilation of CO 2 in 62, 65, 75, 58, 50 and 64%, and after 14 days the reduction was 80, 85, 85, 84, 86 and 93% compared to plants irrigated maintained at temperatures of 25, 30, 35, 40, 45 and 50 °C, respectively. The leaf transpiration was inversely proportional to rates of net photosynthetic assimilation of CO 2 , which has increased with an increased leaf temperature. The physiological behavior of gas exchange of ...

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Photochemical efficiency in bean plants (Phaseolus vulgaris L. and Vigna unguiculata L. Walp) during recovery from high temperature stress

Cited by 22 publications

References 24 publications

Alterations in photochemical efficiency of photosystem II in wheat plant on hot summer day

Alterations in photochemical efficiency of photosystem II in wheat plant on hot summer day

Environmental effects on photosynthetic capacity of bean genotypes

Trocas Gasosas De Plantas Jovens De Taxi-Branco Submetidas À Variação De Temperatura Foliar E Suspensão Da Irrigação

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