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目前,小株采种是白菜杂交一代种子生产的主要方式,而播种和育苗环节是小株采种的两个关键技术环节,阳畦育苗过程中如何识别幼苗受害症状至关重要。随着白菜类蔬菜(大白菜、油菜)杂交一代需种量的增加,商品种子的生产面积也随之扩大。生产商品种子的难易程度和制种产量的高低直接影响白菜种子销售价格和品种的生命力(张德双等,2013a)。白菜杂交一代种子的生产主要有小株采种、老株采种和半成株采种等方式。目前,小株采
At present, sowing of small plants is the main way to produce the first-generation seed of Chinese cabbage. Seeding and nursery are the two key technologies in seed production. It is very important to recognize the symptoms of seedling nursery in the process of nursery stocking. As cabbage vegetables (Chinese cabbage, rape) hybrid generation need to increase the amount of seeds, the production area of commercial seeds also will be expanded. The ease of producing seeds and the level of seed production directly affect the sales price and the vitality of cabbage seeds (Zhang et al., 2013a). Cabbage generation of hybrid seed production mainly include small seed collection, the old strains of seed and semi-mature seed collection methods. At present, a small plant mining