Relationship between carbon isotope discrimination and grain yield in spring wheat under different water regimes and under saline conditions in the ningxia province (North-west china)

文献类型： 外文期刊

第一作者： Xu, X.

作者： Xu, X.;Yuan, H.;Li, S.;Monneveux, P.

作者机构：

关键词： carbon isotope discrimination;preanthesis drought;salinity;surrogates;Triticum aestivum L

期刊名称：JOURNAL OF AGRONOMY AND CROP SCIENCE （ 影响因子：3.473； 五年影响因子：4.395 ）

ISSN： 0931-2250

年卷期： 2007 年 193 卷 6 期

页码：

收录情况： SCI

摘要： The relationship between grain yield and carbon isotope discrimination (Delta) was analysed in wheat grown under different water regimes in the Ningxia Province (north-west of China). When the association was significant, the relationships between grain yield, Delta and other drought tolerance related traits, such as leaf ash content (m(a)), chlorophyll concentration (Chl), relative water content (RWC), stomatal conductance (g(S)) and the ratio of internal CO2 leaf concentration to ambient CO2 concentration (C-i/C-a), were also examined. Using correlation analysis, the relationships were determined during two consecutive years in a set of 20 spring wheat cultivars (landraces, improved varieties and advanced lines) under rainfed and irrigated conditions, including saline conditions. The relationship between Delta and yield within environments highly depended on the quantity of water stored in the soil at sowing, the quantity and distribution of rainfall during the growth cycle, and the irrigation before anthesis. Delta predicted grain yield under limited irrigation (post-anthesis water stress) but not under pre-anthesis water stress (rainfed conditions), fully irrigated and saline conditions. Under limited irrigation, grain Delta correlated significantly to grain yield leaf m(a) at heading and maturity. It also significantly positively correlated to Chl, RWC, g(S) and C-i/C-a assessed at anthesis. A precise characterization of the timing and intensity of the abiotic constraints experienced by the crop is consequently needed before implementing the use of Delta in wheat breeding programmes.

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