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在甜菜个体发育过程中.苗端结构呈现动态变化.种球发芽期为原套原体结构;幼苗期出现分区结构;叶丛繁茂期为分区结构的典型时期,包括原套、亚外套、中央母细胞区、形成层状过渡区及肋状分生组织区;至糖分增长期形成层状过渡区及肋状分生组织区之间的界限已不清晰;至糖分积累期,形成层状过渡区的层数由减少至消失.甜菜苗端结构的动态变化是划分生育期的有力佐证.这种变化与叶丛消长及块根环数的增加有密切关系.
During the process of individual development of sugar beet, the structure of the seedling tip showed dynamic changes.The germination stage of the bulbs was the original protoplasm structure, the seedling structure appeared in the seedling stage, the typical period of the segmented structure was the leafy bushy period, including the original sheath, the sub-sheath, The formation of stratified transitional zone and rib meristematic zone; the boundary between stratiform transitional zone and ribular meristematic zone to the stage of sugar increase is unclear; to the stage of sugar accumulation, a stratified transition is formed The number of layers in the area decreased from disappear to disappear.The dynamic change of sugarbeet tip structure was a powerful evidence to divide the growth period.This change was closely related to the growth and decline of the leaf bundle and the increase of the number of rings in the root tuber.