川渝地区野生鹅观草种质资源形态多样性研究

Study on the Morphological Diversity of Wild Roegneria kamoji Germplasm from Sichuan and Chongqing Province

对采自四川及重庆地区不同采集地的26份鹅观草(Roegneria kamojiOhwi)材料的24个形态学性状进行了观察分析。结果表明:该物种在形态学上具有丰富的遗传多样性(H′=1.955)。遗传多样性指数分析表明,遗传多样性主要集中在材料内(64.48%),材料间的遗传变异为35.52%。从单份材料上看,鄷都新城材料具有最高的遗传多样性(H′=1.382)。聚类分析将26份材料分为4类,聚类结果与其地理分布和采集生境存在一定的关系。主成分分析表明:穗节节间长、第2颖长、外稃芒长、花序长、旗叶宽、外稃宽和小穗小花数7个性状是解释川渝地区野生鹅观草多样性的重要性状,支持聚类结果。还探讨了鹅观草的保护及其利用。

Genetic diversity of 26 accessions of Roegneria kamoji distributed in Sichuan and Chongqing province was studied in this paper. Twenty-four morphological traits were observed. The results showed that there was abundant genetic diversity among these accessions in morphological traits（H＇= 1. 955）. As for the genetic diversity index,it was mainly found within accessions（64. 48~/00）, while among accessions was 35.52 percent. To single accession, accession of Fengdu Xincheng was the highest diversity index（H＇= 1. 382）. Twenty-four wild accessions can be clustered into four groups, the findings implied that a correlation among the tested wild resources, geographical and ecological environment. Principal component analysis showed that internode length, upper glum length, the first lower palea spike length,spike length, leaf width, Lemma length and florets per spikelet number were important traits in explaining the morphological diversity of the region, which also supported cluster analysis results. Additionally,effective conservation and utilization of Roegneria karnoji were discussed in this paper.