母系选种法是采取单株选择、混合栽植,单株采种、单系种植进行比较的方法。其优点是可以避免因自交而造成生活力的衰退,适于大白菜、青菜等蔬菜的选种。因为大白菜、青菜均属异花授粉作物,品种混杂极为严重,单株自交选种往往会引起生活力的衰退,而母系选种则可避免这种衰退。 Maternal selection method is to take single plant selection, mixed planting, single seed collection, single-line planting for comparison. Its advantage is to avoid the decline of vitality caused by self-fertility, suitable for cabbage, vegetables and other vegetables selection. Because cabbage, cabbage are cross-pollination crops, mixed species is extremely serious, self-selection of individual plants tend to lead to the decline of vitality, while the maternal selection can avoid this recession.