限量灌溉不同品种冬小麦茎可溶性糖与产量和水分利用率的关系

【目的】通过分析不同品种冬小麦灌浆期穗下节可溶性糖含量(SS)、籽粒产量、水分利用效率(WUE)的差异,探讨限量灌溉条件下SS与产量和WUE的关系。【方法】以中国北方12个冬小麦品种(系)为材料,在甘肃陇东黄土高原进行大田试验。【结果】不同冬小麦品种之间产量、WUE、SS存在明显差异,随着灌浆进程的推进,SS含量呈先升高后降低的单峰变化趋势,且灌浆中后期差异达到最大。冬小麦灌浆期SS与产量、WUE均呈显著正相关,并且相关性在灌浆中后期和后期达到极显著;【结论】限量灌溉条件下冬小麦籽粒灌浆期SS可作为筛选高产和高水分利用效率品种的参考指标之一。

A Study on the Relatiaonship Between Stem Soluble Sugar with Grain Yield and Water Use Efficiency in Different Winter Wheat Under Limited Irrigation Condition

【Objective】 The present study was carried out to analyze the differences in grain yield, water use efficiency (WUE) and stem soluble sugar (SS) content under spike in grain filling period in various genotypes of dryland winter wheat. The correlation between SS and grain yield, WUE under limited irrigation condition were studied. 【Method】 Twelve winter wheat genotypes (from North China ) were used as materials in an experiment conducted in Loess Plateau of East Gansu. 【Result】 The twelve different genotypes had considerable differences in grain yield, WUE and SS. The SS increased with grain filling proceeding, and the difference reached the maximun at mid-late filling stage. The correlation between SS with grain yield and WUE was highly positive, especially after mid-late grain filling stage. 【Conclusion】 The SS should be evaluated and used as a potential selection criterion in breeding for high grain yield and WUE in winter wheat under limited irrigation condition, which equally inhibit crop assimilation at grain filling stage.