玉米杂种优势早在1921年就开始用于生产,对杂种优势在理论和实践上曾有过众多研究,在遗传和生理生化方面也有过多种解释。但这些研究主要是在其经济产量,而对杂种后代的青饲产量的研究甚少,特别是我国青饲玉米育种工作起步较晚,对其有关的生化性状遗 As early as 1921, the maize heterosis began to be used for production. There have been many studies on the heterosis in theory and practice, and there are also many explanations on the aspects of genetics, physiology and biochemistry. However, these researches mainly focus on their economic yield, but little research has been done on the production of green fodder for the hybrid offspring. Especially, the breeding of green fodder maize in China started late and the biochemical traits