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修饰回交法是将杂种品系间杂交和回交相结合的一种方法,即回交品系间杂交法。本研究用此法,将鸡脚叶L°和扭曲苞叶fg两个突变基因转移到正常的丰产品种徐州142的遗传背景上,获得了具有徐州142综合性状而又表现鸡脚叶和扭曲苞叶的类型。在经济性状上,修饰回交法对提高皮棉产量,打破棉花丰产与早熟两性状的负相关表现出较明显的效应。同时对克服棉花丰产与抗病的不利相关也表现出一定的效果,转变了两性状的相关方向,相关系数由-0.51改变为+0.21。
The modified backcrossing method is a method that combines the crossbreeding and backcrossing of the hybrids, ie the hybridization between backcross strains. In this study, two mutant genes of chicken foot leaf L and twisted bract leaf fg were transferred to the genetic background of the normal high-yielding variety Xuzhou 142. The results showed that Xu Xu 142 had the combined characters of Xuji 142, Hibiscus type. In the economic traits, the modified backcrossing method showed a significant effect on increasing the lint yield and breaking the negative correlation between high yielding and precocious cotton traits. At the same time, it also showed some effects on overcoming the unfavorable correlation between high cotton yield and disease resistance, and changed the relative direction of the two traits. The correlation coefficient changed from -0.51 to +0.21.