Morphological genetic diversity research of Bromus tectorum germplasm

Phenotype diversity for 31 morphological traits of 12 Bromus tectorum germplasm materials from China were analyzed. The results showed that coefficient variation ranged from 3.90% to 37.36%, the length of rhachis, spikelet number, tiller number, pulse number of second glume length, spikelet length, floret number in spikelet showed a relative larger variation. The 1-7 principal components summarized the variation to 87.96%. Ramify number whorled each internode of spindle, leaf length, ear length, floret number, spikelet number on in ramify, spikelet length, stem height, ramify length, leaf width contribute more to main components. Clustering analysis of 31 morphological traits showed that leaf length, ramify number whorled every internode of spindle, stalk diameter, ear internode number, floret number, floret number in spikelet, leaf width, spikelet number, ligulate length, stalk internode number, glumella length, spikelet number, lemma width, glumella width, caryopsis length, stem height, first glume length, lemma length exhibited higher correlation each other. All of materials were classified into three categories through clustering analysis: the materials from Xinjiang Nileke as separate one, the materials from American, Xinjiang Buerjin and Zhaosus as second one, the other materials together for third category. Morphological diversity research laid the foundation for breeding.