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期 刊 ：植物遗传资源学报 2014年 15卷 6期

关键词：砧用南瓜；耐热性；品种；形态指标；

Keywords:Rootstock-used pumpkin, thermotolerance, variety, morphological index,

摘 要 ：摘要：高温是制约黄瓜生产的主要非生物胁迫因子之一。黄瓜（Cucumis sativus L.）嫁接苗能够有效缓解高温胁迫危害,但目前对黄瓜嫁接南瓜砧木品种的认识不足。为此，我们收集了国内外48份砧用南瓜品种，对萌发期和幼苗期进行高温处理（38℃和42℃），通过UPGMA聚类分析，鉴定其耐热性，并筛选适宜的形态指标。共测定了10个形态学指标（发芽率、发芽势、发芽指数、活力指数、株高、茎粗、全株鲜重、全株干重、壮苗指数、热害指数）。结果表明，48份砧用南瓜品种耐热性在萌发期及幼苗期都可以分为4类。在两个时期均表现出较耐高温的品种为：26和27号；对高温敏感的品种有11份：6、9、10、11、13、14、17、20、36、47、48号。种子相对发芽势、相对发芽指数、相对活力指数以及幼苗相对干重可作为砧用南瓜品种资源耐热性鉴定的可靠指标。

Abstract:Abstract: High temperature is one of the major factors that threats to cucumber production. Cucumber grafted seedlings could alleviate the damage induced by high temperature stress, but the awareness of rootstock-used pumpkin varieties is insufficient. In a search for thermotolerace and morphological indexes, we collected 48 specimen rootstock-used pumpkins from different regions. Those varieties were treated with high temperatures (38℃ and 42℃) at germination and seedling stages, respectively, and screened for thermotolerance using UPGMA cluster analysis. Ten indexes (i.e., germination rate, germination potential, germination index, vigor index at germination stage, and plant height, stem diameter, fresh weight, dry weight, seedling index and hot injury index at seedling stage) were evaluated. These results show that the thermotolerance of 48 rootstock-used pumpkin varieties could be divided into 4 types at germination stage and seedling stage. In both development stages there were 2 moderately heat susceptible cultivars (samples 26, 27) and 11 heat sensitive cultivars (samples 6, 9, 10, 11, 13, 14, 17, 20, 36, 47, 48). The relative value of germination potential, germination index, vigor index, dry weight were credible indexes for identification.

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