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4.配合力要高:所谓配合力是指两个品种通过杂交形成杂种优势的能力而言。实践证明,不是任何两个棉花品种杂交都能产生和产生大小一样的优势。故杂交组合的选配和确定还要考虑配合力高低的问题。配合力又有一般配合力和特殊配合力两种。所谓一般配合力是指一个品种和许多品种杂交后,所表现的总体优势的能力;而特殊配合力是指一个品种和另一个品种杂交,其杂种后代所表现优势的能力。因为不同的亲本配制出不同的杂交组合它们之间的差异很大,有的有优势,有的优势较小,有的性状能遗传,有的就不能传递给后代,这主要决定亲本之间遗传差异的大小和亲本遗传性状是否能得到互补。目前在黄河流域棉区以“中棉所7号×徐州142”、“中棉所7号×岗棉1号”和“中棉所7号×岱字棉16号”三个组合杂种优势强,配合力高。正反交也无明显差别。其
4. Combining ability to high: the so-called with the ability of the two hybrids by hybrid ability to form hybrid terms. Practice has proved that not any two cotton varieties can produce the same size and produce the same advantages. Therefore, the selection and selection of hybrid combinations also need to consider the issue of the level of cooperation. Co-operation with general co-operation and special co-operation of two. The so-called general combining ability refers to the ability of a variety to breed with a lot of breeds, and the overall combining ability of the breeds is the special combining ability, which is the ability of one breed to cross with another breed, and the advantages of the hybrid offspring. Because different parents prepare different hybrid combinations, they have great differences, some have advantages, some have smaller advantages, others can inherit traits, others can not pass on to offspring, which mainly determines the inheritance between parents Whether the size of the difference and the parental genetic trait can be complemented. At present, in the cotton area of the Yellow River Basin, the three combinations of “Zhongmian No. 7 × Xuzhou 142”, “Zhongmian No. 7 × Gangmian No. 1” and “Zhongmian No. 7 × Dai Zi Cotton No. 16” , With high. No significant difference between positive and negative. its