关键词: 藜麦, 种质资源, 遗传多样性, 农艺性状, 聚类分析, 主成分分析

Abstract: 【Objective】To determine the genetic diversity of agronomic traits of quinoa germplasm resources.【Methods】Genetic diversity,clustering,correlation and principal component analysis were conducted on 10 agronomic traits of 50 germplasm resources of quinoa.【Results】The germplasm tested of the variation coefficient from high to low was yield （42.67%）,spike grain weight （40.18%）,panicle weight （38.27%）,branch number （34.13%）,1 000 seed weight （29.59%）,spike length （21.88%） and grain diameter （9.47%）.The average genetic diversity index was 1.48.The tested germplasms were divided into 4 categories.Among them,the average yield,thousand-grain weight,main spike weight and spike-grain weight of the second germplasm group were the highest,which could be used as parents of high-yield quinoa breeding.The cumulative contribution rate of the first three principal components of principal component analysis to variation reached 84.38%.In the principal component analysis,the first principal component was the yield component,the second principal component was the grain component,and the third principal component was the branching factor.There was a significant positive correlation between grain diameter and 1 000-grain weight （P<0.01）.Spike grain weight and spike weight were positively correlated with yield （P<0.01）.Panicle length,branch number and 1000-grain weight were negatively correlated （P<0.05）.【Conclusion】The characters of 50 germplasm of quinoa had abundant variation and extensive diversity.Thirteen excellent and high yield germplasm including purple quinoa,D3-1-1,42,F3-1,SC2,J2-1-1,J3-2,A2-2,L4-1-2,F4-1-1,C3-1-2-3,A4-3 and H1-2 had been screened.

Key words: Quinoa, Germplasm resources, Genetic diversity, Agronomic characters, Clustering analysis, Principal component analysis