Mechanisms for the relationships between water-use efficiency and carbon isotope composition and specific leaf area of maize (Zea mays L.) under water stress

文献类型： 外文期刊

第一作者： Zhang, Congzhi

作者： Zhang, Congzhi;Zhang, Jiabao;Zhang, Hui;Zhao, Jinhua;Wu, Qicong;Zhao, Zhanhui;Cai, Taiyi;Zhang, Hui

作者机构：

关键词： Water-use efficiency;Bundle sheath leakiness;Carbon isotope composition;Specific leaf area;Maize;Water stress

期刊名称：PLANT GROWTH REGULATION （ 影响因子：3.412； 五年影响因子：3.691 ）

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： The quick assessment approaches for accurately measuring water-use efficiency (WUE) in maize under water stress are important to water-saving agriculture. We investigated how and whether carbon isotope composition (delta C-13) and specific leaf area (SLA) could be used to assess WUE for maize as influenced by water stress. A pot experiment was conducted twice during six typical maize (Zea mays) growth stages of seedling, jointing, booting, tasseling, filling and maturity, respectively. The ratio between the activities of ribulose 1,5-bisphosphate carboxylase (Rubisco) and phosphoenolpyruvate carboxylase decreased bundle sheath leakiness (phi) under water deficiency, caused more C-13 to be assimilated, and resulted in increased delta C-13 in leaves. Water stress increased the fractionation of C-13 when assimilates were transported from leaf to stem, indicating that water stress affected leaf expansion and translocation of assimilates from leaf to stem, and resulted in thicker leaves and lower SLA. WUE showed significant positive correlations with leaf delta C-13 and SLA, implying that leaf delta C-13 and SLA could effectively reflect the drought adaptation and high WUE under different water conditions.

分类号： S311

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