Abstract: The progress in genetic basis of heterosis were reviewed. Multi-phasal classification was made to the main female parent, Pei'ai 64S, which is widely used in commercial two-line-system hybrid rice breeding. A viewpoint of favorable genes and favorable genic interactions has been proposed to explain the genetic basis of heterosis in which elite pure lines are incorporated.

Key words: heterosis, genetic basis, favorable genes, genie interaction, rice

摘要： 综述了杂种优势遗传基础研究的进展，对当前两系法杂交水稻的主要不育系及其杂种F1进行了多层次的分类，提出了有利基因及有利基因互作是常规稻优良品系参与杂种优势遗传基础这一观点

关键词: 杂种优势, 遗传基础, 有利基因, 基因互作, 水稻