Impact of drought on photosynthesis: Molecular perspective

Zargar, Sajad Majeed; Gupta, Nancy; Nazir, Muslima; Mahajan, Reetika; Malik, Firdose Ahmad; Sofi, Nageebul R.; Shikari, Asif B.; Salgotra, Romesh Kumar

doi:10.1016/j.plgene.2017.04.003

Cited by 177 publications

(92 citation statements)

References 61 publications

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“…This influence was regardless of the stage at which stress was imposed. Water deficit usually elicits rapid stomatal responses to minimize water loss (Zargar et al ) with a corresponding influence of WUE. Drought and foliar fertilizers‐treated soybean plants showed higher water use efficiency at R1 stage, suggesting greater assimilation of CO 2 in relation to the stomatal closure and/or water loss by transpiration.…”

Section: Discussionmentioning

confidence: 99%

Biochemical and physiological impacts of zinc sulphate, potassium phosphite and hydrogen sulphide in mitigating stress conditions in soybean

Batista

Müller

Merchant

et al. 2020

Physiologia Plantarum

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Abbreviations -A, net photosynthetic assimilation rate; APX, ascorbate peroxidase; CAT, catalase; Chl a, chlorophyll a; Chl b, chlorophyll b; Chl a/Chl b, ratio between Chl a and Chl b; E, transpiration rate; ETR, electron transport rate; ETR/A, electron transport to oxygen molecules; F0, initial fluorescence; Fv/fm, potential quantum yield of photosystem II; g s , stomatal conductance; H 2 O 2 , hydrogen peroxide; HS, hydrogen sulphide; LDM, leaf dry matter; MDA, malondialdehyde; MWHC, maximum water holding capacity; NPQ, non-photochemical quenching coefficient; POX, peroxidase activity; PP, potassium phosphite; RDW, root dry weight; REL, rate of electrolyte leakage; RWC, relative water content; SDM, shoot dry matter; SOD, superoxide dismutase; TDM, total dry matter; WD, water deficit; WUEg, intrinsic water use efficiency; WW, well-watered; ZS, zinc sulphate; Ψ s , osmotic potential; Ψ w , water potential; Φ PSII , effective quantum yield of photosystem II.

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Section: Discussionmentioning

confidence: 99%

Biochemical and physiological impacts of zinc sulphate, potassium phosphite and hydrogen sulphide in mitigating stress conditions in soybean

Batista

Müller

Merchant

et al. 2020

Physiologia Plantarum

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“…During drought, for example, plants with complex rhizomatous roots show flexibility in their responses to episodic water shortages (Fry et al , ), and growth of fibrous root material is focused on the upper levels of the soil to maximize water acquisition. Photosynthesis is inhibited during drought, limiting carbon (C) intake and potential energy reserves; thus, adaptive responses to drought are energetically intensive (Zargar et al , ). Drought constrains development before it constrains photosynthesis, which may provide a pool of C that can be utilized for other essential processes (Körner, ).…”

Section: Introductionmentioning

confidence: 99%

Plant root exudation under drought: implications for ecosystem functioning

2019

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Summary Root exudates are a pathway for plant–microbial communication and play a key role in ecosystem response to environmental change. Here, we collate recent evidence that shows that plants of different growth strategies differ in their root exudation, that root exudates can select for beneficial soil microbial communities, and that drought affects the quantity and quality of root exudation. We use this evidence to argue for a central involvement of root exudates in plant and microbial response to drought and propose a framework for understanding how root exudates influence ecosystem form and function during and after drought. Specifically, we propose that fast‐growing plants modify their root exudates to recruit beneficial microbes that facilitate their regrowth after drought, with cascading impacts on their abundance and ecosystem functioning. We identify outstanding questions and methodological challenges that need to be addressed to advance and solidify our comprehension of the importance of root exudates in ecosystem response to drought.

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“…Reduction of photosynthesis in four kinds of C4 grasses under water deficit was dependent principally on biochemical restrictions (Ghannoum et al ), whereas, in C3 species, stomatal limitations had a principal role in the drought‐induced decrease in photosynthesis (Ghannoum ). When the drought is severe, Rubisco activity and the structure of photosystems are damaged in both C3 and C4 plants and may not recover after a period of rewatering (Zargar et al ).…”

Section: Introductionmentioning

confidence: 99%

Warming and water deficit impact leaf photosynthesis and decrease forage quality and digestibility of a C4 tropical grass

Habermann

Oliveira

Contin

et al. 2019

Physiologia Plantarum

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Global warming is predicted to cause more intense extreme events such as heat waves, flooding and severe droughts, producing significant effects on agriculture. In tropics, climate change will severely impact livestock production affecting water availability, forage quality and food for cattle. We investigated the isolated and combined effects of soil water deficit (wS) and + 2°C increase in canopy temperature (eT) on leaf gas exchange, chlorophyll fluorescence, carbohydrate content, forage quality and in vitro dry matter digestibility (IVDMD) of a field‐grown C4 tropical forage grass Panicum maximum Jacq. using a temperature‐free air‐controlled enhancement (T‐FACE) system. The wS and eT treatments showed no effects on photosystem II photochemistry. However, wS under ambient temperature decreased net photosynthesis rate (A), stomatal conductance (gs) and maximum rate of carboxylation of Rubisco (Vcmax), leading to a reduced starch content in leaves. A 16% reduction in leaf dry mass (LDM) and reduction in forage quality by increasing fibers, reducing crude protein (CP) and decreasing the IVDMD was also observed by effect of wS. Warming under adequate soil moisture (eT) significantly increased LDM by 25% but reduced the forage quality, increasing the lignin content and reducing starch, CP and digestibility. The combined wSeT treatment reduced A, gs, Vcmax and the forage quality. When compared to control, the lignin content in leaves increased by 43, 28 and 17% in wS, eT and wSeT, respectively, causing a significant reduction in IVDMD. We concluded that despite physiological mechanisms to acclimate to warming, both warming and water deficit will impair the quality and digestibility of C4 tropical pastures.

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Impact of drought on photosynthesis: Molecular perspective

Cited by 177 publications

References 61 publications

Biochemical and physiological impacts of zinc sulphate, potassium phosphite and hydrogen sulphide in mitigating stress conditions in soybean

Biochemical and physiological impacts of zinc sulphate, potassium phosphite and hydrogen sulphide in mitigating stress conditions in soybean

Plant root exudation under drought: implications for ecosystem functioning

Warming and water deficit impact leaf photosynthesis and decrease forage quality and digestibility of a C4 tropical grass

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