关键词: 大麦, DH群体, 耐湿性, 主成分分析, 动态聚类, 综合评价

Abstract: : 【Objective】Waterlogging stress is one of the major problems in barley production especially in wetlands. Development of tolerant cultivars is the most cost efficient and environmentally safe way to overcome this problem. The objective of this study was to investigate suitable selection criteria for waterlogging tolerance in barley. 【Method】 165 DH lines derived from a barley cross（Yerong × Franklin) were analysed using principal component analysis, dynamic clustering and subordinate function based on the specimen correlation matrix of 12 traits, including plant height(PH), spike length (SL), the top 1st internode length(TFIL), spike per plant (SPP), grains per spike(GPS), grain weight per plant(GWPP), grains per plant(GPP), straw weight per plant(SWPP), weight of 1000 grains(WTG), number of green leaf (NGL) and Chlorophyll 1-2(Chl 1-2). 【Results】Three principal components and their functional equations, two for spike-grain factor and one for NGL factor, were used to identify lines for waterlogging tolerance, which led to the classification of 165 lines into 3 different levels of tolerance. 30, 93 and 42 lines were classified as waterlogging tolerant, medium tolerant and sensitive, respectively. 【Conclusion】The new selecting indices and comprehensive evaluation method provides a useful tool for further study on QTLs controlling waterlogging tolerance and selecting for waterlogging-tolerance in a breeding program.