干旱条件下绵阳26小麦籽粒灌浆特性分析

目的]探讨大田干旱情况下绵阳26及其姊妹系小麦籽粒灌浆过程及其影响因素。方法]在大田持续干旱条件下,以绵阳26及其姊妹系共10个小麦品种(系)为试验材料,用Logistic方程对籽粒灌浆过程拟合,并推导出一系列次级参数,用相关、逐步回归与通径分析方法对不同灌浆参数与粒重关系进行分析。结果]在干旱条件下,绵阳26及其姊妹系小麦的平均灌浆时间相对缩短;籽粒灌浆速率对小麦粒重形成作用明显,而灌浆持续时间与粒重形成无明显的相关关系;逐步回归分析和通径分析表明,灌浆持续期对千粒重可通过间接作用产生影响。结论]在大田持续干旱条件下,绵阳26及其姊妹系小麦可通过不同的策略达到较高的千粒重。

Analysis on Grain Filling Characteristics of Mianyang 26 Wheat under Drought Condition

Objective] The study aimed to investigate the grain filling characteristics of Mianyang 26 and its sister lines under field soil drought condition.Method] Under the water stress,the grain filling processes of ten dominant winter wheat varieties of Mianyang 26 and its sister lines were modeled with Logistic equation and a series of inferior parameters were conducted.The relationship between grain filling parameters and grain weights was analyzed using correlation,stepwise regression and path coefficient analysis.Result] The mean grain filling time of winter wheat was shortened under drought condition. Grain filling rate affected grain weight significantly,but grain filling duration was not related to the grain weight significantly.The stepwise regression and path coefficient analysis results indicated that the grain filling duration could affect the grain filling by affecting the grain filling rate.Conclusion] The wheat of Mianyang 26 and its sister lines could reach a high 1 000-grain filling weight under field continuous drought stress.