水稻小穗柄韧皮部发育的超微结构研究  

STUDY ON THE DEVELOPMENT OF PHLOEM OF PEDICEL VASCULAR BUNDLES IN RICE

作　　者：张丹莹[1] 刘宁[1] 常崇艳[1] 

机构地区：[1]北京师范大学生命科学学院,北京100875

出　　处：《北京师范大学学报（自然科学版）》2006年第4期410-414,共5页Journal of Beijing Normal University(Natural Science)

摘　　要：水稻小穗柄中央维管束后生韧皮部筛管分子和伴胞的发育都经历了一个基本相同的过程,首先是细胞液泡化程度增加;然后细胞核内染色质发生凝集并边缘化;液泡膜破裂,各种细胞器解体;细胞核形成凋亡小体并最终解体.两者超微结构的变化表现出了细胞程序性死亡的特征,液泡的解体在这个过程中具有重要作用.筛管分子的退化要早于伴胞,一般在开花前1周细胞核解体;而伴胞的退化则在开花后1周细胞核内的染色质才开始凝集,这种差异可能与这2种细胞的功能有关.The development of the sieve element in pedicel central vascular bundles of rice. First, the （SE） of meta-phloem is the same as the company cell（CC） vacuolation of cytoplasm increases in SE and CC. Then the chromatin condenses and distributes over the fringe of nuclear. The vacuole membrane breaks and organelles degenerate. The nuclear comes into being apoptosis body and disaggregates at last. The ultrastructural changes of the SE and the CC are characterized by programmed cell death （PCD）. The collapse of the vacuoles is a critical step of the process. The degeneration of the SE is earlier than the CC. The disorganization of nuclear in the SE takes place generally a week before bloom, while the chromatin of nuclear begins to condense in the CC a week after bloom. The differentiation is probably relevant with the function of the SE and CC.

关 键 词：水稻 小穗柄 韧皮部 筛管 伴胞 细胞程序性死亡 

分 类 号：Q959.223.5[生物学—动物学]