以20份小麦品种为材料，采用20％ PEG－6000溶液模拟干旱胁迫，研究小麦种子萌发期对渗透胁迫的响应，并进行抗旱性综合分析，筛选抗旱性鉴定指标。结果表明：PEG胁迫下，不同小麦品种的发芽势、发芽率、发芽指数、胚根长、胚根数、胚芽鞘长度、胚芽长等均有不同程度的降低，各个指标在不同品种间的降低幅度不同，平均降低幅度分别为59．1％、17．1％、51．7％、51．4％、18．5％、19．6％、71．1％；使用单一鉴定指标筛选出的抗旱性品种结果不一致；将隶属函数法与系统聚类法结合，筛选出蜀万8号为强抗旱型小麦品种，绵麦1403为弱抗旱型品种，川麦42和川麦55为不抗旱型品种，其余的为中间抗旱型品种；相关分析表明，相对发芽率与 D值的相关性最大（0．90），可将其作为快速鉴定小麦品种抗旱性的指标。%To identify drought resistance indexes ,responses from twenty wheat varieties to osmotic stress during the germination period were studied by adopting 20% PEG -6000 solution as drought stress treatment , and the overall drought resistance capabilities were analyzed .The results showed that the germination potential ,germination rate ,germi-nation index ,radicle length , radicle number , coleoptile length and germ length of each variety were decreased under PEG stress ,and these indexes of different varieties were reduced at different levels with average reduction rates at 59 . 1% ,17 .1% ,51 .7% ,51 .4% ,18 .5% ,19 .6% and 71 .1% ,respectively .This was inconsistent with the results ex-amined by varieties with single index of drought resistance .The combination of membership function method and system clustering method was used to have identified that Shuwan 8 was strong ,Mianmai 1403 was weak ,Chuanmai 42 and Chuanmai 55 were incapable ,and the rest were moderate in drought resistance .Correlation analyses showed that the rela-tive germination rate had the maximal positive correlation (0 .90 ) with the D value ,indicating that the relative germina-tion rate could be used to provide fast identification of the drought resistance index in wheat .
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