Effect of Drought on the Gas Exchange, Chlorophyll Fluorescence and Yield of Six Different‐Era Spring Wheat Cultivars

Guan, Xiaokang; Song, Le; Wang, T.C.; Turner, Neil C.; Li, Fengmin

doi:10.1111/jac.12103

Cited by 54 publications

(28 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The reduction of ETR/P N in plants treated with EBR indicates that this steroid influences chlorophyll fluorescence and gas exchange. 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).…”

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

View full text Add to dashboard Cite

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.

show abstract

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

View full text Add to dashboard Cite

show abstract

“…These observations, which were consistent across environments, suggest that late‐season photosynthesis was driven by the size of the reproductive carbon sink, which is largely defined by the genetic predisposition to produce higher grain numbers, successful setting those grains and the predisposition to fill them to their potential weight (Gaju et al., ; Long et al., ). Others have shown that rates of post‐anthesis photosynthesis have been upregulated as grain number has increased with wheat breeding (Gaju et al., ; Guan, Song, Wang, Turner, & Li, ; Fischer, ), and there is evidence that if sink capacity is decreased by removing filling grains, photosynthesis will decline as a feedback effect (Long et al., ).…”

Section: Discussionmentioning

confidence: 99%

“…Others have shown that rates of post-anthesis photosynthesis have been upregulated as grain number has increased with wheat breeding (Gaju et al, 2016;Guan, Song, Wang, Turner, & Li, 2014;Fischer, 2008), and there is evidence that if sink capacity is decreased by removing filling grains, photosynthesis will decline as a feedback effect (Long et al, 2006).…”

Section: Discussionmentioning

confidence: 99%

Late‐season photosynthetic rate and senescence were associated with grain yield in winter wheat of diverse origins

Liang

Liu

Chen

et al. 2017

J Agronomy Crop Science

View full text Add to dashboard Cite

There is a lack of studies that have investigated grain yield, its components and photosynthesis in late stages of wheat growth, giving us insufficient understanding of how these factors interact to contribute to yield during this period. As a result, three field experiments were carried out examining 20 winter wheat genotypes of diverse origins under irrigated, terminal drought and dryland conditions in the southern Idaho. Our objective was to evaluate the interaction between post-anthesis physiological traits, especially leaf-level photosynthetic capacity, senescence and yield components on grain yield in different moisture regimes. Genotype differences were found in leaf-level photosynthesis and senescence, canopy temperature depression, grain yield and yield components in each water regime. Grain yield was closely associated with traits related to grain numbers. In all three moisture regimes, positive correlations were observed between grain yield and photosynthesis that were dependent on the timing or physiological growth stage of the photosynthetic measurement: highly significant correlations were found in the mid-and late grain filling stages, but no correlations at anthesis. Consistent with these findings, flag leaf senescence at the late grain filling stage was negatively correlated with grain yield and photosynthetic rate (under terminal drought and dryland conditions). These findings provided evidence that grain yield was sink-limited until the final stages of growth, at which time sustained photosynthesis and delayed senescence were critical in filling grain. Because the trends were consistent in moisture sufficient and deficient conditions, the results suggest that late-season photosynthesis and delayed leaf senescence are driven by the size of the reproductive carbon sink, which was largely governed by factors affecting grain numbers.

show abstract

“…Today, there is a general agreement that a decrease in photosynthesis under drought stress is because of stomatal closure that restricts the diffusion of CO 2 into the leaf or due to non-stomatal limitations, such as inhibition of Rubisco or ATP synthesis (Guan et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Effects of Drought Stress on Photosynthesis Factors in Wheat Genotypes during Anthesis

Sharifi

Mohammadkhani

2016

Cereal Research Communications

View full text Add to dashboard Cite

Drought is one of most important environmental factors inhibiting photosynthesis and decreasing growth and productivity of plants. The sensitivity of crop plants such as wheat to soil drought is particularly serious during reproductive phase is extremely sensitive to plant water status. The aim of this work was to study the effects of drought stress on photosynthesis, photosynthetic pigments, soluble proteins, α-tocopherol and abscisic acid content in six wheat genotypes, two tolerant (Daric and 92 Zhong), two moderately tolerant (Sabalan and DH-2049-3) and two sensitive (Shark and Tevee's'). Total chlorophyll content, relative water content and chlorophyll a/b ratio decreased after long-time drought stress, that decrease in sensitive genotypes was higher than others. Net photosynthesis and stomatal conductance decreased significantly (P < 0.05) in flag leaves of our genotypes under drought stress after pollination, that decrease in sensitive genotypes was higher, too. Abscisic acid content, soluble protein content and α-tocopherol increased under drought stress, that increase in tolerant genotypes was higher. There was a significant negative correlation (P < 0.05) between photosynthesis factors and abscisic acid content in flag leaves of all genotypes. It can be concluded that Daric and 92 Zhong had a better photosynthesis factors compared to other genotypes and showed a higher capacity to tolerate drought stress.

show abstract

Effect of Drought on the Gas Exchange, Chlorophyll Fluorescence and Yield of Six Different‐Era Spring Wheat Cultivars

Cited by 54 publications

References 42 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

Late‐season photosynthetic rate and senescence were associated with grain yield in winter wheat of diverse origins

Effects of Drought Stress on Photosynthesis Factors in Wheat Genotypes during Anthesis

Contact Info

Product

Resources

About