21个紫花苜蓿品种不同越冬率组间遗传性状的差异分析

Over-winter Rate with the Genetic Traits Coefficient of the Introduced 21 Varieties of Medicago sativa in Arid Grassland

以研究不同越冬率组间遗传性状的差异分析为目的,对内蒙古镶黄旗进行抗寒、抗旱的生态适应性试验引入的21个紫花苜蓿品种进行越冬率分析,并探讨了紫花苜蓿的7个遗传性状与越冬率之间的关系。结果表明:(1)国内4个紫花苜蓿品种越冬率均在80%以上,国外引进紫花苜蓿品种越冬率在80%以上的有4个,分别来自于美国和加拿大,从澳大利亚引进的4个品种全不能越冬;(2)按越冬率为标准将21个品种聚类为4组,以分析不同越冬率组之间遗传性状的差异,结果表明花色、叶片长、株丛高度、生长习性4个形态特征在组间差异显著;(3)生长习性、叶片长与越冬率呈显著负相关,相关系数分别为-0.582和-0.537,表明叶片长短和生长习性与苜蓿抗寒进化有关。

21 entries of Medicago sativa , which 12 were from America, 4 from Australia, 1 from Canada and 4 from China, were evaluated on ecological adaptabilities in Xianghuang Qi, Inner Mongolia from 2000 to 2004. 7 genetic characteristics were using as the criteria for performance evaluated. The results of field trails showed that： （ 1 ） The over - winter rates of the 4 domestic entries were over 80%. The over - winter rates of 4 entries from Australia were under 10%. （2）The 21 entries were clustered to 4 groups based on over -winter rate, genetic traits of flower color, canopy height, leaf length and growth habit, which had significant differences among 4 groups. （3） Leaf length and growth habit had significant negative correlation with the over - winter rate.