摘要： 冬小麦品种生育后期耐热性遗传差异的表现受环境影响较大.通过1997～2000年间在北京对群体气-冠温差、灌浆特性、热感指数等三种耐热性评价方法有效性的比较研究,认为热感指数反映品种对后期热胁迫的敏感程度,利用千粒重热感指数可鉴定出后期耐热性较好的基因型.气-冠温差法快速、简便、准确,但叶片持绿期长的品种气-冠温差一般较大,可结合对灌浆速率的评价来筛选生育期适中的耐热基因型.在年的试验中,小麦品种鲁96098表现耐热性强,千粒重稳定.

关键词: 冬小麦, 耐热性, 气-冠温差, 热感指数, 子粒灌浆速率

Abstract: Environmental factors significantly affect the performance of the heat tolerance of winter wheat during maturity. The validity of three determinations, canopy temperature depression (CTD),grain filling and heat susceptibility index(HSI), was evaluated during 1997 - 2000 in Beijing. The HSI value reflected the sensitivity of plants to heat stress. Genotypes tolerant to heat stress could be identified by HSI of 1000 - kernel weight. CTD is a quick,convenient and valid method in evaluating the heat tolerance of winter wheat. On the other hand, the variety with a longer green lasting period often showed higher CTD. The genotype tolerant to heat stress with a moderatemature period could be used to select the heat tolernat genotype with a moderate mature period, simultaneously.Wheat cultivar Lu 936098 performed a good heat tolerance and a relatively stable 1000 - kernel weight during three-year trials.

Key words: Winter wheat, Heat tolerance, Canopy temperature depression, Heat susceptibility index, Grain filling rate

中图分类号: 

• S512.101