黄瓜种质资源耐热性鉴定

Identification of heat tolerance in cucumber

为了筛选出耐热性强的黄瓜种质资源用于耐热黄瓜新品种的选育,本研究以来源不同的38份黄瓜种质为材料,分别在种子萌发期和苗期进行40℃以上的高温处理,通过测定种子发芽率和幼苗耐热指数,并用隶属函数法对38份材料的耐热性进行了综合评价。结果显示:黄瓜的耐热性在种子萌发期与苗期的鉴定结果基本一致,获得了强耐热黄瓜材料3份,热敏黄瓜材料11份。以上结果表明种子萌发期和幼苗期均可用作黄瓜耐热性的鉴定,所得耐热材料将为黄瓜耐热育种打下种质基础。

In order to obtain highly heat-tolerant cucumber germplasms for the breeding of heat-tolerant cucumber varieties, thirty-eight cucumber varieties from different sources were employed to determinate both germination percentages of seeds at the germination stage and the indexes of heat injuries at the seedling stage at more than 40℃. And then they were comprehensively evaluated b＇y membership function in the aspect of heat tolerance. The results showed that heat-tolerance of cucumber at germination stage was basically consistent to that at the seedling stage. Three high- ly heat-tolerant cucumber germplasms and 11 heat-sensitive ones were obtained on the basis of the above evaluations. The aforesaid results suggested that heat-tolerance of cucumber germplasms could be evaluated at both seed germination stage and seedling stage, and the heat-tolerant cucumber germplasms obtained would be the substantial materials for the breeding of heat-tolerant cucumber varieties.