春小麦碳同位素分辨率与水分利用效率的相关性

Relationship between water-use efficiency and carbon isotope discrimination in spring wheat

以20个春小麦基因型为材料,研究了其旗叶和籽粒的碳同位素分辨率及水分利用效率在宁夏的两种生态条件下(有限灌溉地区和雨养地区)连续3 a的变化与相关性。结果表明,WUE、ΔLa、ΔGm存在年际间、试验地点间、基因型间的差异,基因型与环境互作效应不显著。ΔLa与ΔGm相关性较好,但WUE与ΔLa、ΔGm的关系存在年际间的变化,高WUE品种的筛选应该将碳同位素分辨率与其它生理生化或农艺指标相结合。

In order to study the relationship between the water-use efficiency and carbon isotope discrimination, twenty spring wheat varieties/lines were grown in two ecological environments （limited irrigation area and rain-fed area） in Ningxia from 2004 to 2006 spring wheat growth season. Water-use efficiency （WUE） and car- bon isotope discrimination of flag leaves （ △La ） and kernels （ △Gm ） were measured. The result showed that large significance was observed in genotypic, site and year variation for WUE ,△La, △Gm. And genotype × environment interaction for them was not significant. Although △La and △Gm were significantly correlated in two years, lager variation were notable for relation between △La, △Gm and WUE across years. As a result, A may serve as a predictive criterion for high water-use efficiency, but which should combined with other traits under limited irrigation and rain-fed conditions in Ningxia.