干旱区生态环境知识资源中心(Arid): Simulating short-term light responses of photosynthesis and water use efficiency in sweet sorghum under varying temperature and CO2 conditions

Arid

DOI	10.3389/fpls.2024.1291630
	Simulating short-term light responses of photosynthesis and water use efficiency in sweet sorghum under varying temperature and CO2 conditions
	Yang, Xiao-Long; Ma, Xiao-Fei; Ye, Zi-Piao; Yang, Long-Sheng; Shi, Jun-Bo; Wang, Xun; Zhou, Bei-Bei; Wang, Fu-Biao; Deng, Zi-Fa
通讯作者	Deng, ZF
来源期刊	FRONTIERS IN PLANT SCIENCE
ISSN	1664-462X
出版年	2024
卷号	15
英文摘要	Climate change, characterized by rising atmospheric CO2 levels and temperatures, poses significant challenges to global crop production. Sweet sorghum, a prominent C-4 cereal extensively grown in arid areas, emerges as a promising candidate for sustainable bioenergy production. This study investigated the responses of photosynthesis and leaf-scale water use efficiency (WUE) to varying light intensity (I) in sweet sorghum under different temperature and CO2 conditions. Comparative analyses were conducted between the A(n)-I, g(s)-I, T-r-I, WUEi-I, and WUEinst-I models proposed by Ye et al. and the widely utilized the non-rectangular hyperbolic (NRH) model for fitting light response curves. The Ye's models effectively replicated the light response curves of sweet sorghum, accurately capturing the diminishing intrinsic WUE (WUEi) and instantaneous WUE (WUEinst) trends with increasing I. The fitted maximum values of A(n), g(s), T-r, WUEi, and WUEinst and their saturation light intensities closely matched observations, unlike the NRH model. Despite the NRH model demonstrating high R-2 values for A(n)-I, g(s)-I, and T-r-I modelling, it returned the maximum values significantly deviating from observed values and failed to generate saturation light intensities. It also inadequately represented WUE responses to I, overestimating WUE. Across different leaf temperatures, A(n), g(s), and T-r of sweet sorghum displayed comparable light response patterns. Elevated temperatures increased maximum A(n), g(s), and T-r but consistently declined maximum WUEi and WUEinst. However, WUEinst declined more sharply due to the disproportionate transpiration increase over carbon assimilation. Critically, sweet sorghum A(n) saturated at current atmospheric CO2 levels, with no significant gains under 550 mu mol mol(-1). Instead, stomatal closure enhanced WUE under elevated CO2 by coordinated g(s) and T-r reductions rather than improved carbon assimilation. Nonetheless, this response diminished under simultaneously high temperature, suggesting intricate interplay between CO2 and temperature in modulating plant responses. These findings provide valuable insights into photosynthetic dynamics of sweet sorghum, aiding predictions of yield and optimization of cultivation practices. Moreover, our methodology serves as a valuable reference for evaluating leaf photosynthesis and WUE dynamics in diverse plant species.
英文关键词	sweet sorghum leaf gas exchange photosynthetic light response intrinsic water use efficiency instantaneous water use efficiency model temperature CO2 concentration
类型	Article
语种	英语
开放获取类型	gold, Green Published
收录类别	SCI-E
WOS记录号	WOS:001199877200001
WOS关键词	STOMATAL CONDUCTANCE ; LEAF PHOTOSYNTHESIS ; ELECTRON-TRANSPORT ; C-4 PHOTOSYNTHESIS ; GAS-EXCHANGE ; ELEVATED CO2 ; STRESS ; GROWTH ; MODEL ; PLANT
WOS类目	Plant Sciences
WOS研究方向	Plant Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/403883
推荐引用方式 GB/T 7714	Yang, Xiao-Long,Ma, Xiao-Fei,Ye, Zi-Piao,et al. Simulating short-term light responses of photosynthesis and water use efficiency in sweet sorghum under varying temperature and CO2 conditions[J],2024,15.
APA	Yang, Xiao-Long.,Ma, Xiao-Fei.,Ye, Zi-Piao.,Yang, Long-Sheng.,Shi, Jun-Bo.,...&Deng, Zi-Fa.(2024).Simulating short-term light responses of photosynthesis and water use efficiency in sweet sorghum under varying temperature and CO2 conditions.FRONTIERS IN PLANT SCIENCE,15.
MLA	Yang, Xiao-Long,et al."Simulating short-term light responses of photosynthesis and water use efficiency in sweet sorghum under varying temperature and CO2 conditions".FRONTIERS IN PLANT SCIENCE 15(2024).