气候变化领域集成服务门户(CCPortal): Evaluation of potential increase in photosynthetic efficiency of cassava (Manihot esculenta Crantz) plants exposed to elevated carbon dioxide

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DOI	10.1071/FP23254
	Evaluation of potential increase in photosynthetic efficiency of cassava (Manihot esculenta Crantz) plants exposed to elevated carbon dioxide
	Ravi, V.; Raju, Saravanan; More, Sanket J.
发表日期	2024
ISSN	1445-4408
EISSN	1445-4416
起始页码	51
结束页码	6
卷号	51 期号:6
英文摘要	Cassava (Manihot esculenta Crantz), an important tropical crop, is affected by extreme climatic events, including rising CO2 levels. We evaluated the short-term effect of elevated CO2 concentration (ECO2) (600, 800 and 1000 ppm) on the photosynthetic efficiency of 14 cassava genotypes. ECO2 significantly altered gaseous exchange parameters (net photosynthetic rate (Pn), stomatal conductance (gs), intercellular CO2 (Ci) and transpiration (E)) in cassava leaves. There were significant but varying interactive effects between ECO2 and varieties on these physiological characteristics. ECO2 at 600 and 800 ppm increased the Pn rate in the range of 13-24% in comparison to 400 ppm (ambient CO2), followed by acclimation at the highest concentration of 1000 ppm. A similar trend was observed in gs and E. Conversely, Ci increased significantly and linearly across increasing CO2 concentration. Along with Ci, a steady increase in water use efficiency [WUEintrinsic (Pn/gs) and WUEinstantaneous (Pn/E)] across various CO2 concentrations corresponded with the central role of restricted stomatal activity, a common response under ECO2. Furthermore, Pn had a significant quadratic relationship with the ECO2 (R2 = 0.489) and a significant and linear relationship with Ci (R-2 = 0.227). Relative humidity and vapour pressure deficit during the time of measurements remained at 70-85% and similar to 0.9-1.31 kPa, respectively, at 26 +/- 2 degrees C leaf temperature. Notably, not a single variety exhibited constant performance for any of the parameters across CO2 concentrations. Our results indicate that the potential photosynthesis can be increased up to 800 ppm cassava varieties with high sink capacity can be cultivated under protected cultivation to attain higher productivity.
英文关键词	cassava; climate change; elevated CO2; food security; Manihot esculenta Crantz; photosynthetic efficiency; stomatal conductance; water use efficiency
语种	英语
WOS研究方向	Plant Sciences
WOS类目	Plant Sciences
WOS记录号	WOS:001222181200001
来源期刊	FUNCTIONAL PLANT BIOLOGY
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/303364
作者单位	Indian Council of Agricultural Research (ICAR); ICAR - Central Tuber Crops Research Institute; Indian Council of Agricultural Research (ICAR); ICAR - Directorate on Onion & Garlic Research
推荐引用方式 GB/T 7714	Ravi, V.,Raju, Saravanan,More, Sanket J.. Evaluation of potential increase in photosynthetic efficiency of cassava (Manihot esculenta Crantz) plants exposed to elevated carbon dioxide[J],2024,51(6).
APA	Ravi, V.,Raju, Saravanan,&More, Sanket J..(2024).Evaluation of potential increase in photosynthetic efficiency of cassava (Manihot esculenta Crantz) plants exposed to elevated carbon dioxide.FUNCTIONAL PLANT BIOLOGY,51(6).
MLA	Ravi, V.,et al."Evaluation of potential increase in photosynthetic efficiency of cassava (Manihot esculenta Crantz) plants exposed to elevated carbon dioxide".FUNCTIONAL PLANT BIOLOGY 51.6(2024).