甘、青两省春小麦遗传多样性演变

对甘、青两省自20世纪40年代以来生产上曾大面积应用的200多个春小麦地方品种和育成品种资料进行了分析，结果表明，19个形态性状，5个农艺性状和2个品质性状都存在着广泛的遗传多样性，虽然育成品种农艺性状和品质性状的遗传多样性总体上大于地方品种，但是从20世纪60年代开展春小麦杂交育种工作之后，育成品种形态性状，农艺性状和品质性状遗传多样性呈下降趋势，评价育种对小麦遗传多样性的影响，不能足将地方品种和育成品种的遗传多样性作一简单比较就得出结论，而是应该在遗传多样性演变的动态过程中去研究。

Evolvement of genetic diversity of spring wheat varieties in Gansu and Qinghai Provinces

Data of more than 200 landraces and bred varieties of spring wheat,which have been planted in Gansu and Qinghai Provinces since 1940s widely,were analyzed to determine the genetic diversity of spring wheat in this region.The results show that there exist abundant genetic diversity among varieties in 19 morphologic characters,5 agronomic and 2 qualitative characters.Genetic diversity of morphologic characters,agronomic characters and qualitative characters descends generally since 1960s which is initial stage of spring wheat breeding in Gansu and Qinghai Provinces.It is unreasonable to conclude from comparing genetic diversity value simply between landrace and bred varieties when evaluate affection of breeding on genetic diversity.It is reasonable to conclude from the dynamic process of evolvement of genetic diversity.