Abstract:

Six different alfalfa varieties at home and abroad were acted as materials.The dynamic changes of soluble sugar,total nitrogen and malondialdehyde was studied,so as to find out their relationships with cold resistance,and then variation analysis and cluster analysis were performed.The results indicated that the soluble sugar content increased from the middle of September and reached the peak in the middle of November,then descended gradually till the middle of May.It showed that soluble sugar was a kind of ...

Key words: alfalfa, cold resistance, cluster analysis;

摘要：

以国内外6个紫花苜蓿品种为试验材料,研究了不同时间、不同品种根部可溶性糖含量、全氮含量及丙二醛含量的动态变化,以了解它们与苜蓿抗寒性的关系,并对这些指标进行了变异分析和聚类分析。结果表明,苜蓿根内的可溶性糖含量从9月中旬开始升高,11月中旬达到最高峰,之后开始逐渐下降,一直延续到次年5月中旬,说明可溶性糖是一种低温保护物质,能够提高苜蓿对低温胁迫的适应。各苜蓿品种根部全氮含量从9月到3月均保持在较高水平,4月份有一个明显的增高,而5月份显著下降,可见全氮含量不仅关系到苜蓿对低温的抵御能力,而且直接关系到苜蓿翌年春季的再生与返青。不同苜蓿品种根部丙二醛含量在9月份时较高,而后逐渐下降,到1月份出现最低值,1月份以后又表现出逐渐升高的趋势。另外,对各紫花苜蓿品种抗寒性研究表明,草原二号、龙牧803和润布勒苜蓿为高抗寒品种;准格尔苜蓿和德宝为中等抗寒品种;Euver苜蓿为低抗寒品种。

关键词: 紫花苜蓿 抗寒性 聚类分析