西藏野生油菜种质资源植株形态性状多样性分析

Analysis of Plant morphology characteristic diversity of Tibetan wild rape Germplasm Resources

为拓宽西藏油菜的种质资源,并为发掘可提供西藏油菜研究利用的优异遗传资源,对来自西藏6个地区38个县的50份野生油菜种质资源形态性状进行分析。结果表明:(1)西藏野生油菜种质资源的农艺性状存在丰富的遗传变异,变异系数最高是株粒重为75.00%,多样性指数最高的是单株有效角果数为0.9821;(2)通过主成分分析,将西藏野生油菜种质资源21个农艺性状化为6个主成分,其中累积贡献率为85.19%,以角果因子的贡献率最高为42.99%;(3)基于形态性状应用非加权配对法聚类,在遗传距离为6.61水平上可聚为五大类群,这五大类群可区分为矮秆粒重型、多分枝多角果型、高秆少分枝型等五种类型。

In order to widening germplasm resources of Tibetan wild rape and to provide better genetic resources for doing research,analysis are being done for 50 morphological characters of wild rape germplasm resources from 38 counties of 6 districts in Tibet Autonomous Region.The results show that：（1） there are abundant genetic variation in agronomy traits for Tibetan wild rape germplasm,the highest coefficient of variation is 75.00%.Available pod number has highest diversity index with value of 0.9821;（2） principle component analyses resulted 6 main components from 21 agronomy traits of Tibetan wild rape.The cumulative contribution rate is 85.15%,and the available pod number has the highest contribution rate of 42.99%;（3） based on non-weighted linkage method of clustering for morphological characters,5 main groups can be clustered at genetic distance level of 6.61.The 5 groups are short stem with heavy seeds,multiple branches with multiple pods,tall stem with few branches etc.