广西省芒野生居群表型多样性研究

通过方差、聚类和相关分析等方法对分布在我国广西省芒的13个野生居群的18个叶片、茎秆、花序和小穗的表型性状进行居群内和居群间的遗传多样性研究。结果表明,18个表型性状在居群内和居群间均存在极显著差异,说明芒种群内表型性状变异较丰富且遗传多样性较高。表型分化系数的变幅为17.99%～47.21%,其中,叶片、茎秆、花序和小穗性状分别为38.01%,29.80%,32.84%和27.14%,所有性状均值为32.05%,说明芒表型性状的变异主要来源于居群内。UPGMA聚类结果表明,在阈值5.388处可以将13个居群分为4个类群,聚类结果表明,聚成一类的居群在地理位置上并不靠近。表型性状与地理因子的相关性分析表明,部分表型性状的变化与地理因子呈显著或极显著相关性。本研究结果为我国芒属能源植物在遗传改良以及野生资源的保护与利用等方面提供了可参考的理论依据。

A study on phenotypic diversity of Miscanthus sinensis natural population in Guangxi province

18 phenotypic traits of 13 Miscanthus sinensis nature populations origin from Guangxi province were measured in this paper. Analysis of variance for all traits showed that there were significant differences among and within populations. The result indicated that Miscanthus sinensis was abundant in genetic diversity. The average of phenotypic differentiation coefficient (V_st) of 18 phenotypic traits was 32.05% with the range from 17.99% to 47.21% and the V_st of leaf, stem, panicle and spikelet were 38.01%, 29.08%, 32.84% and 27.14%, respectively.13 natural populations of M. sinensis in Guangxi province could be divided into 4 groups by UPGMA cluster analysis which indicated that M. sinensis varieties were uncomformity with its geographic origin. The correlation analysis between phenotypic traits and ecological factor showed the some traits have significant or extremely significant correlation with ecological factor. These result offered the basic data for further study of conservation and genetic breeding of Miscanthus.