Photosynthetic gas exchange, chlorophyll fluorescence and some associated metabolic changes in cowpea (Vigna unguiculata) during water stress and recovery

Souza, Rogéria Pereira; Machado, Eduardo Caruso; Silva, J.A.B.; Lagôa, Ana Maria Magalhães Andrade; Silveira, Joaquim Albenísio Gomes da

doi:10.1016/s0098-8472(03)00059-5

Cited by 444 publications

(321 citation statements)

References 29 publications

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“…The extent of grain yield loss depends on the intensity of the soil drought, i.e., whether the drought is mild or acute, its duration, frequency, plant growth stage during which adverse soil moisture conditions occur, and the efficiency of plant rehydration after the soil drought ceases (Souza et al 2004;Barnabás et al 2008).…”

Section: Introductionmentioning

confidence: 99%

Rapid plant rehydration initiates permanent and adverse changes in the photosynthetic apparatus of triticale

Hura

Ostrowska

et al. 2015

Plant Soil

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Background and aims The reasons for partial recovery after a soil drought are not fully understood and have not been studied so far. This study investigated the physiological and biochemical responses of triticale cultivars with differential recovery ability after soil water deficit. Methods Activity of the photosynthetic apparatus under soil drought followed by rehydration was estimated. Plant antioxidant potential was determined based on the measurement of catalase and peroxidase activity. The levels of hydrogen peroxide and superoxide radical were assessed. Results Under rehydration, the not fully-recovered cultivar experienced further significant increase in the content of H 2 O 2 and inhibited activity of the photosynthetic apparatus, as compared to the drought period. On 42 nd day of the rehydration, the not fully-recovered cultivar showed also a reduced photosynthetic activity in the flag leaves, which resulted in a significant decrease in its grain yield. The first week of a rapid rehydration involved a decrease in total peroxidase and catalase activities. The increased content of H 2 O 2 was compensated only when leaf water content was gradually restored in the first week of the rehydration and no further decrease in the activity of the photosynthetic apparatus was noticed. Conclusions A destructive effect of the rapid rehydration was manifested in an intensification of the physiological processes associated with reactive oxygen species (ROS) overproduction. An important cause of hydrogen peroxide overproduction seems to be the electron leakage due to overloading of the electron transport chain (ETC) in the PSI and PSII.

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Section: Introductionmentioning

confidence: 99%

Rapid plant rehydration initiates permanent and adverse changes in the photosynthetic apparatus of triticale

Hura

Ostrowska

et al. 2015

Plant Soil

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“…Nevertheless, this is not considered to be indicative of damage to the photosynthetic apparatus; it only indicates that the recovery occurred from very low levels of these variables. The absence of damage to the photosynthetic apparatus also was observed in cowpea after drought/ rewatering by Souza et al (2004).…”

Section: Resultsmentioning

confidence: 72%

“…This relationship was linear for gs values below 0.60 mol m -2 s -1 (Figure 4), indicating that A was limited mainly by gs (MEDRANO et al, 2002) during the stress and initial phases of recovery (SOUZA et al, 2004). For gs values exceeding 0.60 mol m -2 s -1 , A was less related to gs, indicating that the latter was inhibited by factors other than soil water availability, such as light flux density; quality and duration of radiant energy; CO 2 content in the air; and air temperature (LOPES; LIMA, 2015).…”

Section: Resultsmentioning

confidence: 92%

Physiological Responses of Cowpea Under Water Stress and Rewatering in No-Tillage and Conventional Tillage Systems

et al. 2017

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-The goal of this work was to evaluate the physiological responses of cowpea under water stress and rehydration in conventional and no-tillage systems. We evaluated two crop systems (conventional and no tillage) and three water conditions (no stress, moderate stress and severe stress). The following were determined: leaf area, total dry matter, photosynthetic rate, stomatal conductance, transpiration rate, internal CO 2 concentration and leaf water potential. Water stress affected all variables evaluated, with the exception of leaf water potential. Cowpea recovered with respect to all variables after rehydration at both stress levels. Stomatal closure is an important drought tolerance mechanism, and cowpea can be considered a conservative species (i.e., one that prioritizes water status maintenance rather than photosynthetic rate). Planting systems did not affect photosynthetic rate. The tillage system promoted greater accumulation of biomass and higher leaf area.Keywords: Leaf area. Photosynthesis. Stomatal conductance. Vigna unguiculata. Water potential. RESPOSTAS FISIOLÓGICAS DE FEIJÃO-CAUPI SOB ESTRESSE HÍDRICO E REIDRATAÇÃO EM PLANTIO DIRETO E CONVENCIONAL RESUMO -O objetivo do trabalho foi avaliar as respostas fisiológicas em feijão-caupi sob efeito de estresse hídrico e reidratação nos sistemas de plantio direto (PD) e convencional (PC). Foram avaliados dois sistemas de plantio (direto e convencional) e três condições hídricas (sem estresse, estresse moderado e estresse severo).Foram determinados: área foliar, matéria seca total, fotossíntese, condutância estomática, transpiração, concentração interna de CO 2 e potencial hídrico foliar. O estresse hídrico afetou todas as variáveis avaliadas, com exceção do potencial hídrico foliar. Houve recuperação de todas as variáveis após reidratação em ambos níveis de estresse. O fechamento estomático é um importante mecanismo de tolerância à seca, sendo que o feijão-caupi pode ser considerado uma espécie conservadora, i.e. que prioriza a manutenção do status hídrico em detrimento da produção fotossintética. Os sistemas de plantio não afetaram as taxas fotossintéticas. O sistema de plantio direto promove maior acúmulo de biomassa e maior área foliar.Palavras-chave: Área foliar. Fotossíntese. Condutância estomática. Vigna unguiculata. Potencial hídrico.

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“…The stomatal closure limits the CO 2 uptake. This, in return, might promote an imbalance between the photochemical activity at photosystem II (PSII) and the electron requirement for photosynthesis generating an over-excitation on photosynthetic system and the photoinhibitory damages of PSII reaction centres (Souza et al 2004). These results confirm that application of N, P and K at highly elevated levels is detrimental to the health of the forest and is not a suitable method of waste management.…”

Section: Fertilization Alters Tree Physiological Conditionmentioning

confidence: 99%

The application of potato starch effluent causes a reduction in the photosynthetic efficiency and growth of Scots pine (Pinus sylvestris L.)

Koprowski

Robertson

Wils

et al. 2015

Trees

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Key message The high concentration of N and K caused a weakening of physiological conditions of the trees. Application of N, P and K from starch effluent is not a suitable method of waste management. Abstract Since 1984, potato starch effluent has been applied to trees in the Iława Forest Inspectorate to promote the biological utilization of this waste product containing high amounts of nitrogen (N), phosphorus (P) and potassium (K). We examined the tree rings of Scots pine (Pinus sylvestris L.) to study the effect of intensive fertilization on tree rings. A total of 120 samples were taken from three sites representing a fertilized and unfertilized area and trees growing at a control site, outside the forest waste water system. We found that February and March temperature influenced the growth of tree rings. We used multiple regression to investigate the influence of N, P and K concentration, the amount of waste water and February and March temperature upon tree growth. Akaike information criterion (AIC) model selection was applied to choose the most influential factors upon growth, and additional multiple regression analyses were performed for two subsets of variables. Trees growing on the unfertilized site responded positively to N content and negatively to P content. For the fertilized site, the high concentration of N and K together with decreasing volume of waste water caused a growth decline. Trees from fertilized area also showed a decrease in their photosynthetic efficiency.

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Photosynthetic gas exchange, chlorophyll fluorescence and some associated metabolic changes in cowpea (Vigna unguiculata) during water stress and recovery

Cited by 444 publications

References 29 publications

Rapid plant rehydration initiates permanent and adverse changes in the photosynthetic apparatus of triticale

Rapid plant rehydration initiates permanent and adverse changes in the photosynthetic apparatus of triticale

Physiological Responses of Cowpea Under Water Stress and Rewatering in No-Tillage and Conventional Tillage Systems

The application of potato starch effluent causes a reduction in the photosynthetic efficiency and growth of Scots pine (Pinus sylvestris L.)

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