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对玉米品种克鲁格黄马齿进行粒重20轮双向混合选择,并评价选择粒重的直接反应和间接反应。另一个研究目的是考察雄配子对种子大小的直接效应,看这类效应是否表现出杂种优势。无论选择大粒或小粒,选择效果均极为显著,前者千粒重每轮减少7.21克,后者每轮增加4.68克。雄配子对籽粒大小的效应取决于花粉源。按植株的表型性状进行选择是作物改良研究的一种最为简便的方法。1961年Gardner介绍分层混合选择(Stratified mass selection)的方法,重新激起人们对混合选择的兴趣。他指
The Kruger yellow teeth of corn variety were selected for 20 rounds of bi-directional mixing, and the direct reaction and indirect reaction of selecting grain weight were evaluated. Another study aims to examine the direct effects of male gametes on seed size and see if such effects show heterosis. Regardless of the choice of large or small particles, the selection effect is extremely significant, the former 1000-grain weight reduction of 7.21 grams per round, the latter increase of 4.68 grams per round. The effect of male gametes on grain size depends on the source of the pollen. Choosing plants by their phenotypic traits is one of the easiest ways to study crop improvement. In 1961 Gardner introduced the method of stratified mass selection to rekindle interest in mixed choices. He said