Drought exerts a greater influence than growth temperature on the temperature response of leaf day respiration in wheat (<i>Triticum aestivum</i>)

Fang, Liang; Yin, Xinyou; Putten, P.E.L. van der; Martre, Pierre; Struik, P.C.

doi:10.1111/pce.14324

Cited by 15 publications

(25 citation statements)

References 71 publications

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“…Plant management practices, experimental set‐up and treatments have been detailed in our earlier study (Fang et al, 2022 ), therefore, only a brief description is given here.…”

Section: Methodsmentioning

confidence: 99%

“…The GE and CF data of A – I inc curves with I inc ranged from 200 to 40 μmol m −2 s −1 under PR and NPR conditions of both experiments have previously been used to estimate leaf day respiration (Fang et al, 2022 ).…”

Section: Methodsmentioning

confidence: 99%

“…Values of day respiration ( R d ) were taken from our previous estimates for the same experiments (Fang et al, 2022 ). Photosynthetic parameters of the FvCB model were estimated by using the data of A – I inc and A – C i curves at each T leaf , following the procedure described by Yin et al ( 2009 ).…”

Section: Methodsmentioning

confidence: 99%

“…were more sensitive to T growth under DS conditions (Figure S4), and were closer to daytime T growth under DS than under WW conditions, implying that the adverse conditions forced plants to acclimate more in order to maximize CO 2 uptake for survival. Our previous study showed that there is an interactive effect of drought and T growth on the sensitivity of R d to T leaf (Fang et al, 2022), and consequently the R d /(A sat + R d ) ratio was altered by drought and T growth , suggesting that leaf carbon use efficiency, that is, [1 − R d /(A sat + R d )], was altered by environmental changes (Figure S5).…”

Section: General Photosynthetic Acclimation Responses To Growth Tempe...mentioning

confidence: 99%

“…for estimating the calibration factor (i.e. s (abs) here) did allow to reach a nearly NPR state, even for extreme conditions (Fang et al, 2022).…”

Section: (E)mentioning

confidence: 99%

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Neglecting acclimation of photosynthesis under drought can cause significant errors in predicting leaf photosynthesis in wheat

Fang

Martre

Jin

et al. 2022

Global Change Biology

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Extreme climatic events, such as heat waves, cold snaps and drought spells, related to global climate change, have become more frequent and intense in recent years. Acclimation of plant physiological processes to changes in environmental conditions is a key component of plant adaptation to climate change. We assessed the temperature response of leaf photosynthetic parameters in wheat grown under contrasting water regimes and growth temperatures (Tgrowth). Two independent experiments were conducted under controlled conditions. In Experiment 1, two wheat genotypes were subjected to well‐watered or drought‐stressed treatments; in Experiment 2, the two water regimes combined with high, medium and low Tgrowth were imposed on one genotype. Parameters of a biochemical C3‐photosynthesis model were estimated at six leaf temperatures for each factor combination. Photosynthesis acclimated more to drought than to Tgrowth. Drought affected photosynthesis by lowering its optimum temperature (Topt) and the values at Topt of light‐saturated net photosynthesis, stomatal conductance, mesophyll conductance, the maximum rate of electron transport (Jmax) and the maximum rate of carboxylation by Rubisco (Vcmax). Topt for Vcmax was up to 40°C under well‐watered conditions but 24–34°C under drought. The decrease in photosynthesis under drought varied among Tgrowth but was similar between genotypes. The temperature response of photosynthetic quantum yield under drought was partly attributed to photorespiration but more to alternative electron transport. All these changes in biochemical parameters could not be fully explained by the changed leaf nitrogen content. Further model analysis showed that both diffusional and biochemical parameters of photosynthesis and their thermal sensitivity acclimate little to Tgrowth, but acclimate considerably to drought and the combination of drought and Tgrowth. The commonly used modelling approaches, which typically consider the response of diffusional parameters, but ignore acclimation responses of biochemical parameters to drought and Tgrowth, strongly overestimate leaf photosynthesis under variable temperature and drought.

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“…Plant management practices, experimental set‐up and treatments have been detailed in our earlier study (Fang et al, 2022 ), therefore, only a brief description is given here.…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%