摘要： 田间测定农作物抗旱性所使用的胁迫敏感指数(1-Yd/Yp)/(1-∑Yd/∑Yp)是所谓抗旱系数Yd/Yp的变型,二者相关系数r=-1.因此,前者并没有改进后者的缺陷.作者以30个冬小麦为材料,经过两年试验,提出了作物抗旱指数的概念,其表达式:品种旱地产量×抗旱系数/供试品种旱地平均产量,使抗旱生理指标的抗旱系数与农艺指标品种旱地产量得到较好的结合,更适合育种工作者应用.

关键词: 农作物, 抗旱指数, 聚类分析

Abstract: Stress susceptibility index (1-Yd/Yp)/(1-∑Yd/∑Yp) used to determine drought resistance on the field is the alter form of drought resistance coefficient(Yd/Yp).The correlative coefficient above both is r=-1.Therefore，the former doesn't improve the defect of the latter.Using thirty winter wheat varieties as trial materials，after two years experim ents，the concept of drought resistance index in crops was put for ward，its expressing equation is:the yield in dryland x drought resistance coefficient/average yiell in dryland，it makes the drought resistance coefficient (physical index) correlate well with the yield in dryland (agronomy index) and is suited for breeder.

Key words: Crop, Drought resistance index, Cluster analysis