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0引言品种混杂退化的直接表现是纯度下降,群体中出现了各种不符合该品种典型性状的植株。影响品种群体遗传组成稳定的因素,也是造成棉花品种混杂退化的原因。近几年来,通过参与尉犁县陆
0 INTRODUCTION The direct degradation of hybrid varieties is the decline of purity, there are a variety of plants that do not meet the typical characteristics of the varieties of plants. Factors that affect the stability of genetic composition of breed groups are also the reasons for the mixed degeneration of cotton varieties. In recent years, by participating in Yuli County land