Coordinate changes in photosynthesis, sugar accumulation and antioxidative enzymes improve the performance of Jatropha curcas plants under drought stress

Silva, Evandro N.; Ribeiro, Rafael Vasconcelos; Ferreira‐Silva, Sérgio Luiz; Vieira, Suyanne A.; Ponte, Luiz Ferreira Aguiar; Silveira, Joaquim Albenísio Gomes da

doi:10.1016/j.biombioe.2012.06.009

Cited by 69 publications

(56 citation statements)

References 39 publications

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“…Guan et al (2014) evaluated early cultivars of Triticum aestivum under water deficit conditions and found increases in the NPQ values, which were related to increased thermal dissipation. The use of EBR caused a reduction in EXC due to the decrease in NPQ, which can be explained by the higher efficiency in the light capture by PSII (Silva et al 2012). Sales et al (2013) conducted a study on the recovery of photosynthesis in Saccharum officinarum plants subjected to a water deficit and a low temperature substrate and reported a 25% increase in EXC.…”

Section: Discussionmentioning

confidence: 99%

Brassinosteroids improve photosystem II efficiency, gas exchange, antioxidant enzymes and growth of cowpea plants exposed to water deficit

Lima

Lobato

2017

Physiol Mol Biol Plants

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Water deficit is considered the main abiotic stress that limits agricultural production worldwide. Brassinosteroids (BRs) are natural substances that play roles in plant tolerance against abiotic stresses, including water deficit. This research aims to determine whether BRs can mitigate the negative effects caused by water deficiency, revealing how BRs act and their possible contribution to increased tolerance of cowpea plants to water deficit. The experiment was a factorial design with the factors completely randomised, with two water conditions (control and water deficit) and three levels of brassinosteroids (0, 50 and 100 nM 24-epibrassinolide; EBR is an active BRs). Plants sprayed with 100 nM EBR under the water deficit presented significant increases in U PSII , q P and ETR compared with plants subjected to the water deficit without EBR. With respect to gas exchange, P N , E and g s exhibited significant reductions after water deficit, but application of 100 nM EBR caused increases in these variables of 96, 24 and 33%, respectively, compared to the water deficit ? 0 nM EBR treatment. To antioxidant enzymes, EBR resulted in increases in SOD, CAT, APX and POX, indicating that EBR acts on the antioxidant system, reducing cell damage. The water deficit caused significant reductions in Chl a, Chl b and total Chl, while plants sprayed with 100 nM EBR showed significant increases of 26, 58 and 33% in Chl a, Chl b and total Chl, respectively. This study revealed that EBR improves photosystem II efficiency, inducing increases in U PSII , q P and ETR. This substance also mitigated the negative effects on gas exchange and growth induced by the water deficit. Increases in SOD, CAT, APX and POX of plants treated with EBR indicate that this steroid clearly increased the tolerance to the water deficit, reducing reactive oxygen species, cell damage, and maintaining the photosynthetic pigments. Additionally, 100 nM EBR resulted in a better dose-response of cowpea plants exposed to the water deficit.

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Section: Discussionmentioning

confidence: 99%

Brassinosteroids improve photosystem II efficiency, gas exchange, antioxidant enzymes and growth of cowpea plants exposed to water deficit

Lima

Lobato

2017

Physiol Mol Biol Plants

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“…Results obtained by Sapeta et al (2013) are similar to those found in this work, with an increase in RWC at the peak of water stress and recovery after 7 days of rehydration. According to Silva et al (2012) osmotic adjustment is responsible for maintaining a high RWC in J. curcas tissues.…”

Section: Discussionmentioning

confidence: 99%

Morphophysiological changes in young plants of Jatropha curcas L. (Euphorbiaceae) subjected to water stress and recovery

Oliveira¹,

Silva²,

Santana³

et al. 2016

Afr. J. Agric. Res.

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To investigate drought-induced changes in morphophysiological characteristics, seedlings of two genotypes of Jatropha curcas (CNPAE 183 and CNPAE 191) were grown under two watering regimes: irrigated (-33.1 to 13.5 to kPa) and water deficit (-409.5 to 49.5 to kPa) for 55 days, followed by six days of rehydration (DAR). Withholding water led to a significant reduction (p<0.05) of leaf water potential (Ψ W ) and an increase in relative water content (RWC). The values of net photosynthetic rate (P N ), stomatal conductance to water vapor (g S ) and transpiration (E) were significantly (p<0.05) reduced 21 and 34 days after starting treatment (DAST) in plants of genotypes CNPAE 183 and CNPAE 191, respectively. After 6 DAR, only CNPAE 191 achieved a recovery of P N and E. Moreover, significantly (p<0.05) lower g S was measured in recovering plants of both genotypes, as compared to the controls. Drought stress led to reductions of 57 and 65% in whole-plant hydraulic conductance (K L ) in genotypes CNPAE 183 and CNPAE 191, respectively. Full recovery of K L was observed after 6 DAR. The average water consumption was 18% lower in plants subjected to water shortage, as compared to irrigated plants. However, drought-induced reduction in growth led to lower biomass water use efficiency (WUE biomass ) in plants subjected to water deficit. The effect of water stress was more intense in CNPAE 183 than in CNPAE 191, regarding the growth variables (leaf area, height and diameter), dry mass and root volume. Moreover, a delay in the effect of water stress in genotype CNPAE 191 was also observed, which suggests a higher tolerance of this genotype as compared to CNPAE 183. Altogether, the results showed strong drought-induced stomatal limitation of carbon assimilation and growth in J. curcas. Slight genotypic differences were detected, CNPAE 191 being less sensitive to the imposed experimental conditions than CNPAE 183.

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“…When the water stress is moderate or severe, decreases in photosynthesis are possibly due to a decreased RuBP availability and/or decreased Rubisco activity (Lawlor 1995). Water stress has been reported to lead to an accumulation of sugars and a feedback down-regulation of photosynthesis (Souza et al 2004, Silva et al 2012. Under mild water stress, diffusional limitations (both stomatal and mesophyll conductance to CO 2 ) dominate over the non-diffusional ones.…”

Section: Line Grain Number (Gn) Grain Weight (G) (Gw) Shoot Biomass (mentioning

confidence: 99%

Application of photochemical parameters and several indices based on phenotypical traits to assess intraspecific variation of oat (Avena sativa L.) tolerance to drought

et al. 2017

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Functionality of the photosynthetic system under water stress is of major importance in drought tolerance. Oat (Avena sativa L.) doubled haploid (DH) lines obtained by pollination of F 1 oat crosses with maize were used to assess the differences in plant genotypic response to soil drought. The investigations were based on the measurements of gas exchange and chlorophyll a fluorescence kinetics. Drought was applied to 17-day-old seedlings by withholding water for 14 days and subsequent plant recovery. Non-stressed optimally watered plants served as controls. Yield components were determined when plants reached full maturity. It was shown differences among the oat lines with respect to drought stress susceptibility (SI) and stress tolerance index mean productivity and drought susceptibility index. Sensitivity to drought of individual DH lines was significantly different, as demonstrated by the correlation between drought susceptibility index and yield components, such as dry weight (GW) or grain number (GN) of the harvested plants. GW and GN were lower in drought-sensitive genotypes exposed to drought stress compared to those resistant to drought. The principal component analysis allow to separate three groups of lines differing in their sensitivity to drought stress and indicated that tolerance to drought in oat has a common genetic background.

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Coordinate changes in photosynthesis, sugar accumulation and antioxidative enzymes improve the performance of Jatropha curcas plants under drought stress

Cited by 69 publications

References 39 publications

Brassinosteroids improve photosystem II efficiency, gas exchange, antioxidant enzymes and growth of cowpea plants exposed to water deficit

Brassinosteroids improve photosystem II efficiency, gas exchange, antioxidant enzymes and growth of cowpea plants exposed to water deficit

Morphophysiological changes in young plants of Jatropha curcas L. (Euphorbiaceae) subjected to water stress and recovery

Application of photochemical parameters and several indices based on phenotypical traits to assess intraspecific variation of oat (Avena sativa L.) tolerance to drought

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