Genotypic variation in intrinsic transpiration efficiency correlates with sugarcane yield under rainfed and irrigated field conditions

文献类型： 外文期刊

第一作者： Natarajan, Sijesh

作者： Natarajan, Sijesh;Fukai, Shu;Natarajan, Sijesh;Basnayake, Jaya;Lakshmanan, Prakash;Lakshmanan, Prakash;Lakshmanan, Prakash

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期刊名称：PHYSIOLOGIA PLANTARUM （ 影响因子：4.5； 五年影响因子：4.576 ）

ISSN： 0031-9317

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收录情况： SCI

摘要： Intrinsic transpiration efficiency (iTE), the ratio of photosynthesis (A) to stomatal conductance (g(s)), is considered a useful trait for improving productivity; however, higher iTE with high A is more desirable than that with low g(s). This study dissects iTE of 20 sugarcane genotypes to understand its relationship with total dry matter (TDM) and cane yield (TCH) under irrigated and rainfed conditions. Water stress reduced mean A and g(s) by 56 and 61%, and mean TDM and TCH by 55 and 59%, respectively; however, genotype x irrigation treatment interaction was smaller than genotype variance. Mean iTE increased from 117.4 mu mol mol(-1) in the irrigated treatment to 130.6 mu mol mol(-1) in the rainfed treatment. In irrigated conditions, iTE had high heritability (H-b(2) = 0.67) and significant genetic correlation with TDM (r(g) = 0.58) and TCH (r(g) = 0.72). Under water stress, at g(s) below 0.1 mol m(-2) s(-1), non-stomatal limitation to A was evident and iTE had low heritability (H-b(2) = 0.2). Whereas in the g(s) range of 0.1-0.4 mol m(-2) s(-1), heritability of iTE (H-b(2) = 0.63) and its genetic correlation with TDM (r(g) = 0.78) and TCH (r(g) = 0.75) were maximised. There was significant genotypic variation in photosynthetic capacity (A(c)), and the differences were related to TDM and iTE. Selecting genotypes with higher iTE and A(c) could offer potential for improving productivity without the unfavourable effect of low g(s).

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