大白菜杂种优势的利用,在我国已经取得很大成绩。但目前影响一代杂种大面积推广的重要问题,仍然是如何解决更加简便地、有效地生产一氏杂交种子的问题。即能不能提出一种比利用“自交不亲和系”、“雄性不育系”或“两用系”制种更简单的制种技术,使其杂种率同样接近100％。几年来,作者对大白菜花期自交迟配性的初步研究结果表明,将来利 The utilization of heterosis in Chinese cabbage has achieved great success in our country. However, the important issue that affects large-scale popularization of F1 hybrids is still how to solve the problem of producing hybrid rice seeds more easily and effectively. That is, we can not propose a more simple seed production technology than using “self-incompatibility”, “male-sterile” or “dual-purpose” seed production to make the hybrid rate equally close to 100%. Over the past few years, the author of the early flowering date of Chinese cabbage initial results show that the future