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《Chinese Journal of Grassland》 2011-02
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Morphological Genetic Diversity of Bromus L.

HAO Feng1,2,XU Zhu1,LI Ping1,LI Jin-zai3,MA Yu-bao1,YAN Wei-hong1(1.Grassland Research Institute,Chinese Academy of Agricultural Science/Key Laboratory of Grassland Resources & Ecology,Ministry of Agriculture,Hohhot 010010,China;2.Graduate School of Chinese Academy of Agricultural Science,Beijing 100018,China;3.Agricultural Diversification Workstations of Dalate County of Ordos City of Inner Mongolia,Dalate 014000,China)  
Phenotypic diversity of 13 species of Bromus L.were analyzed using 30 morphological traits,The results showed that there were significant differences among Bromus species and the genetic diversity was higher.Variation coefficient ranged from 7.59%～127.01%,morphological traits with larger variation were length of lemma awn,first internode length of rachis,vein number of lower glume,length of leaf blade,length of anther et al.The results of principal component analysis showed that cumulative contribution rate of the first 6 principal components was 87.29%,and spikelet number on ramify,vein number of lower glume,length of ligule,vein number of upper glume,width of lemma,length of lemma awn,width of leaf blade,tiller number,length of spikelet,first internode length of rachis,length of lower glume,width of palea,panide internode number were the main factors which brought about morphological variation.Cluster analysis based on the morphological traits showed that all of these traits were divided into five groups: group one: length of caryopsis,group two: width of palea,group three: length of palea,length of lemma and length of lower glume,group four: first internode length of rachis,vein number of lower glume and length of lemma awn,group five: the rest traits.13 species were divided into four groups: group one: B.inermis,B.rubens,B.marginatus,B.biebersteinii×B.inermis,B.catharticus,B.biebersteinii,B.beneken,B.remotiflorum,B.tectorum and B.variegatus,group two: B.plurinodes,group three: B.japonica,group four: B.scoparius.
【Key Words】： Bromus L. Genetic diversity Morphology Principal component analysis Clustering
【Fund】： 中央级公益性科研院所基本科研业务费专项(中国农业科学院草原研究所)“锡林郭勒典型草原生态生产功能区评价与适应性管理模式研究”(2010-Z-3) 中央级公益性科研院所基本科研业务费专项(中国农业科学院草原研究所)“八种优异禾草种质资源评价研究”(2011);; 中俄项目“优异作物基因资源收集、评价、利用与安全保存研究——中俄优异牧草遗传资源收集评价及其挖掘利用研究”(2008DFR30200)
【CateGory Index】： S543
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