Effects of Drought on Photosynthetic Performance and Water Relations of Four Vigna Genotypes

Campos, Paula Scotti; Ramalho, José C.; Lauriano, J.A.; Silva, M.J.; Matos, M. do Céu

doi:10.1023/a:1007018804086

Cited by 32 publications

(17 citation statements)

References 19 publications

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“…First, leaves of drought-stressed plants did not display visible symptoms of injury or H 2 O 2 accumulation (Figure A1); Second, membrane lipid content and composition were not modified in leaf tissues of plants submitted to the drought treatment alone (Figure 2 and Figure 3; Table A1 and Table A3). Contrary to the results of previous studies [29,30,38], IT83-D did not appear more sensitive to water stress than EPACE-1. It is likely that, in our experimental conditions, the severity of the drought treatment was not sufficient to reveal differences in drought tolerance between the two cultivars.…”

Section: Discussioncontrasting

confidence: 99%

“…It is likely that, in our experimental conditions, the severity of the drought treatment was not sufficient to reveal differences in drought tolerance between the two cultivars. Indeed, when compared to previous data obtained with the same cowpea cultivars submitted to drought, the RWC of 60%–70% measured at 14 day corresponds to a leaf water potential of −1.5 MPa [29], which is equivalent to a water stress defined as moderate in [31,39]. Consistent with this, several features of the responses of cowpea to severe drought, such as the decrease in leaf membrane lipid content [21,31] and the induction of VuPAT1 expression [26], were not observed in the present work.…”

Section: Discussionmentioning

confidence: 80%

“…Cowpea is a staple legume crop in semi-arid regions of the tropics and subtropics, where meteorological conditions promote the co-occurrence of drought and ozone stresses. While the impact of water stress on cowpea has been extensively studied [21,29,30,31], the response of this crop to ozone is less documented [32]. In recent studies, the responses of cowpea to ozone have been investigated in Asian and African cultivars with respect to biomass production, yield, photosynthesis, nitrogen fixation and ROS detoxification [33,34,35,36,37].…”

Section: Introductionmentioning

confidence: 99%

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Combined Effects of Ozone and Drought on the Physiology and Membrane Lipids of Two Cowpea (Vigna unguiculata (L.) Walp) Cultivars

Rebouças

Sousa

Bagard

et al. 2017

Plants

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The interactive effects of drought and ozone on the physiology and leaf membrane lipid content, composition and metabolism of cowpea (Vigna unguiculata (L.) Walp.) were investigated in two cultivars (EPACE-1 and IT83-D) grown under controlled conditions. The drought treatment (three-week water deprivation) did not cause leaf injury but restricted growth through stomatal closure. In contrast, the short-term ozone treatment (130 ppb 12 h daily during 14 day) had a limited impact at the whole-plant level but caused leaf injury, hydrogen peroxide accumulation and galactolipid degradation. These effects were stronger in the IT83-D cultivar, which also showed specific ozone responses such as a higher digalactosyl-diacylglycerol (DGDG):monogalactosyl-diacylglycerol (MGDG) ratio and the coordinated up-regulation of DGDG synthase (VuDGD2) and ω-3 fatty acid desaturase 8 (VuFAD8) genes, suggesting that membrane remodeling occurred under ozone stress in the sensitive cultivar. When stresses were combined, ozone did not modify the stomatal response to drought and the observed effects on whole-plant physiology were essentially the same as when drought was applied alone. Conversely, the drought-induced stomatal closure appeared to alleviate ozone effects through the reduction of ozone uptake.

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Section: Discussioncontrasting

confidence: 99%

Section: Discussionmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

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Combined Effects of Ozone and Drought on the Physiology and Membrane Lipids of Two Cowpea (Vigna unguiculata (L.) Walp) Cultivars

Rebouças

Sousa

Bagard

et al. 2017

Plants

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“…3D). Starch degradation and accumulation of soluble sugars have also been reported in cowpea exposed to water stress (Campos et al 1999) and in barley leaves during osmotic stress (Villadsen et al 2005). In this study, a significant ( P ≤ 0.05) increase in 12 C‐soluble sugars was also observed from 5 days of water deficit treatment (Fig.…”

Section: Discussionmentioning

confidence: 95%

Water‐deficit accumulates sugars by starch degradation—not by de novo synthesis—in white clover leaves (Trifolium repens)

Lee

Jin

Jung

et al. 2008

Physiologia Plantarum

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Labeling 13CO2 in steady-state condition was used to estimate quantitative mobilization of recently fixed carbon or stored sugar during water-deficit in white clover (Trifolium repens L.). Water-deficient gradually decreased leaf-water parameters and total amount of recently fixed carbon. Amount of 13C incorporated into glucose, sucrose and soluble sugars fraction rapidly decreased after 3 days of water-deficit treatment. In contrast, the previously stored soluble sugars significantly increased after 5 days of water-deficit with a coincidence of significant decrease in starch concentration. A highly significant (P < or = 0.001) relationship between the decrease in leaf-water potential caused by water-deficit and the increase in ratio of soluble sugar/starch concentration was observed in water deficit-stressed plants. The data indicate that soluble carbohydrate accumulated by water-deficit treatment is mainly because of the hydrolysis of previously stored starch rather than to de novo synthesis.

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“…). Starch degradation and the accumulation of soluble sugars have also been reported in other plants exposed to abiotic stresses (Campos et al , Villadsen et al ). Soluble sugars are produced by starch degradation or by de novo synthesis (Lee et al ).…”

Section: Discussionmentioning

confidence: 71%

NADPH from the oxidative pentose phosphate pathway drives the operation of cyclic electron flow around photosystem I in high‐intertidal macroalgae under severe salt stress

Lü

Gao

et al. 2015

Physiologia Plantarum

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Pyropia yezoensis (Bangiales, Rhodophyta) is a representative species of high-intertidal macroalgae, whose blades can tolerate extreme stresses, such as salt stress and desiccation. In this study, the photosystem (PS) responses of P. yezoensis blades under salt stress were studied. Our results showed that when the effective photochemical quantum yield of PS (Y) II decreased to almost zero under high salt stress, YI still had a relatively high activity rate. PSII was therefore more sensitive to salt stress than PSI. Furthermore, in the presence of 3-(3', 4'-dichlorophenyl)-1,1-dimethylurea (DCMU), YI rose as salinity increased. The YI values for DCMU-treated thalli decreased in the presence of glucose-6-phosphate dehydrogenase (EC 1.1.1.49, G6PDH) inhibitor (glucosamine, Glucm). The YI values were ∼0.09 in the presence of methyl viologen (MV) and almost zero in the presence of dibromothymoquinone (DBMIB). These results demonstrated that under severe salt stress (120‰ salinity) PSI activity was driven from a source other than PSII, and that stromal reductants probably supported the operation of PSI. Under salt stress, the starch content decreased and soluble sugar levels increased. The G6PDH and 6-phosphogluconate dehydrogenase (EC 1.1.1.44) activities increased, but cytosolic glyceraldehyde 3-phosphate dehydrogenase (EC 1.2.1.12) activity decreased. Furthermore, the NADPH content increased, but NADH decreased, which suggested that soluble sugar entered the oxidative pentose phosphate pathway (OPPP). All these results suggested that NADPH from OPPP increases the cyclic electron flow around PSI in high-intertidal macroalgae under severe salt stress.

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Effects of Drought on Photosynthetic Performance and Water Relations of Four Vigna Genotypes

Cited by 32 publications

References 19 publications

Combined Effects of Ozone and Drought on the Physiology and Membrane Lipids of Two Cowpea (Vigna unguiculata (L.) Walp) Cultivars

Combined Effects of Ozone and Drought on the Physiology and Membrane Lipids of Two Cowpea (Vigna unguiculata (L.) Walp) Cultivars

Water‐deficit accumulates sugars by starch degradation—not by de novo synthesis—in white clover leaves (Trifolium repens)

NADPH from the oxidative pentose phosphate pathway drives the operation of cyclic electron flow around photosystem I in high‐intertidal macroalgae under severe salt stress

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