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选育优势更强,产量更高的杂交水稻组合,首先必须对产生杂种优势的遗传基础理论以及抗性等问题有个正确的认识。为此笔者结合几年来的工作实践并参照前人的试验结果,对杂交水稻强优势组合选育的若干问题进行初步探讨。一、扩大遗传差异与杂种优势问题。杂种优势与双亲性状遗传距离的大小有密切关系,双亲遗传距离大,杂种优势强;双亲遗传距离小杂种优势不强[1]。在杂交水稻新组合的选育中,我们需要采用恢×恢、恢×保选育新的恢复系,配组的杂交水
Breeding hybrid rice combinations with stronger predominance and higher yield must first have a correct understanding of the basic theories of genetics and resistance that produce heterosis. For this reason, combining with the work practices in past years and with reference to the experimental results of the predecessors, the author conducted a preliminary study on some problems in the selection and breeding of hybrids with strong superiority. First, to expand the genetic differences and heterosis. Heterosis is closely related to the size of the parents’ genetic distance. The parents’ genetic distance is large and the heterosis is strong. The parents’ genetic distance is small, and the heterosis is not strong [1]. In the selection and breeding of new hybrid rice combinations, we need to use restore × restore, restore × conservation of new restorer lines, with the group of hybrid water