早在本世纪20年代,人们已开始应用杂种优势来提高作物产量。但直到现在对杂种优势形成的生理和遗传机理却知道得很少。为什么会产生杂种优势?杂种优势能否早期预测?一向是生物学研究的重要课题。近年来,农作物杂种优势利用的群众运动蓬勃开展,如何准确而快速地选择优势杂种的亲本组合,就成为当前急待解决的问题。 As early as the 1920s, people have begun to apply heterosis to increase crop yields. However, until now the physiological and genetic mechanisms for the formation of heterosis have been poorly understood. Why hybrid heterosis? Heterosis can predict the early? Has always been an important issue in biological research. In recent years, the mass movement to harness the heterosis of crops has flourished. How to select the parental combinations of dominant hybrids accurately and rapidly has become an urgent issue to be solved urgently.