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本文以小青口大白菜为研究对象，描述了大白菜阶段发育中生长锥的中部纵剖面形状（宽／高）亚外套层数、肋状分生组织细胞形状（横径／纵径）的变化趋势：生长锥中部纵剖面宽／高在整个阶段发育中由大变小，再从小变大，最小值出现在生殖生长期开始至花芽分化期之间，亚外套层数在花芽分化前逐步增加，花芽分化后逐步减少。肋状分生组织细胞横径与纵径之比在整个阶段发育中由大变小，到花芽分化前变为１左右，以后无明显变化。同时观察了生长锥各组织分区在营养生长期到生殖生长期中的变化趋势：原套始终为一层细胞；形成层状细胞区在营养生长期中逐渐增加，进入生殖生长期后细胞逐渐纵向生长直到不呈层状排列。中央母细胞区和周缘区在整个阶段发育中呈“～”形变化。结合这些指标和苗龄，可推断春季大白菜植株是否完成了营养生长期，从而判断植株是否将发生未熟抽薹。
In this paper, Xiaoqinkou Chinese cabbage as the research object, describes the development of Chinese cabbage stage growth cone central longitudinal section shape (W / H) sub coat layer, rib meristematic cell shape (diameter / vertical diameter) Variations: The width / height of longitudinal section of the growth cone changed from large to small in the whole stage, and then increased from small to large. The minimum appeared in the period of reproductive growth to the stage of flower bud differentiation. The number of sub-coat layers gradually increased before flower bud differentiation Increase, gradually reduced after flower bud differentiation. The ratio of transverse and longitudinal diameters of rib-like meristematic cells changed from large to small during the whole stage of development, and became about 1 before the flower bud differentiation, with no significant change afterwards. At the same time, we observed the change tendency of vegetative growth zones from vegetative growth stage to reproductive growth stage. The original set was always a layer of cells. The formation of stratified zone gradually increased in vegetative growth stage, Grow until not layered arrangement. The central cell area and the peripheral area showed “~” shape changes during the whole stage of development. Combined with these indicators and seedling age, it can be inferred whether the spring cabbage plants have completed the vegetative growth stage, so as to determine whether the plants will be unfamiliar with bolting.