Abstract:

The study on genetic basis of heterosis has received much attention, of which, some genetic effects such as epistasis plays an important role as genetic basis of heterosis in rice and other crops. This paper bases on the research status of dominant and the overdominance hypothesis, elaborated its application prospect and limitation of these viewpoint at first. Then it spreads out exposition for epistasis and the comprehensive effects of heterosis, and summarizes about heterosis theory and several new opinions. Finally analysis and discuss on the heterosis theory's related question, and then proposed scientific prospects. We wish that this paper will provide a number of information and ideals to research style of the basis of heterosis theory.