摘要： 根据4年的研究结果，分析了在冬小麦基因型产量和株高变异较大时，离体叶片失水速率（RWL）与产量构成和植株性状的关系。研究表明，RWL基因型间存在显着差异。在多数情况下，RWL与产量和千粒重呈负相关，与株高呈正相关。研究还发现基因型位次随失水时间的变化，有低失水，先快后慢，先慢后快和高失水4种类型。RWL与产量的负相关随失水时间延长而减弱。基因型差异以失水2～3h最为明显，且更具有较大生理意义，因此提出以离体2～3h为测定RWL的适宜时间。否定了国外多年延用6～9hRWL作为指标的结论。

关键词: 冬小麦, 基因型, 离体叶片, 失水速率, 产量结构, 植株性状

Abstract: The relationship between excised leaf water loss rate(RWL)and yield components/plant traits was analyzed by using winter wheat genotypes varying remarkably in yield and plant height in 4 year experiments. It was demonstrated that significant difference in RWL existed among genotypes.Under most circumstances,RWL was correlated negatively with yield and grain weight,and positively with plant height. The results laid a principal basis for simultaneous selection for high yield and low RWL. It was found that genotypic rank varyed with the variation of water loss duration. Based upon the variation,four types of genotypes (continuously low,early low later high,early high alter low, and continuously high) were identified .Correlation between RWL and yield reduced with extended water loss duration. More remarkable difference among genotypes was revealed at 2-3 hours of water loss with greater physiological importance, therefore it is better to collect water loss parameters 2-3 hours after in vitro treatment. This renewed the method of using RWL 6-9 hours after in vitro treatmet.

Key words: Winter wheat, Genotype, RWL, Yield component, Plant trait

中图分类号: 

• S512.1