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杂交稻不育系繁殖田的父、母本播期,一向是根据所要达到的理想花期标准而定。过去一般提法:理想花期标准是母本始穗早于父本2—3天。根据这一标准,做法上是先播母本,待母本长至一叶一心时播第一期父本,二叶一心时播二期父本。实践证明,这个标准是不理想的,这种作法也是错误的,特别是对当前主要的珍汕97A和V20A两个亲本来说,更为不洽当。下面谈几个例子:
The male and female parent sowing date of the sterile CMS line in hybrid rice has always been based on the desired standard of flowering. The past general formulation: the ideal flowering standard is the female parent ear earlier than the father 2-3 days. According to this standard, practice is to broadcast the mother of the original, until the mother grow to a leaf when the heart broadcast the first issue of the male parent, second leaf as soon as the second broadcast of the male parent. Practice has proved that this standard is not ideal, and this approach is also wrong, especially for the current main Zhenshan 97A and V20A two parents, more unfriendly. Here are a few examples: