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结球大白菜是典型的雌雄同花异交作物所以,随着自交世代的推进,生活力衰退乃是一种正常现象。但是,不同性状其衰退速度和衰退程度是有显著差异的。本试验只就单株重、结球性和结实性等3个性状的衰退情况做了系统性的研究。试材选用帮色、生育期差异明显的3个品种作为试验材料。即早皇白:白帮,生育期为45～50天。青帮河头纹:青白帮,生育期为80～85天。天津青麻叶:青帮、生育期为90天以上。
Chinese cabbage is a typical hermaphrodite outcrop So, with the promotion of self-generation, the decline of viability is a normal phenomenon. However, the rate of decline and recession of different traits are significantly different. In this study, we only systematically studied the recession of three traits, such as plant weight, coccygeus and seedability. Specimens used to help color, significant differences between the three reproductive stages as a test material. That is, the early imperial white: white gang, the growth period of 45 to 50 days. Green Gang head pattern: Green White Gang, the growth period of 80 to 85 days. Tianjin green linen leaves: Green Gang, the growth period of 90 days or more.