Programmed cell death during terminal bud senescence in a sympodial branching tree, Eucommia ulmoides

被引:2
作者
Kalima-N'Koma MWANGE
机构
[1] College of Life Sciences
[2] Peking University
[3] Beijing
[4] China
关键词
DNA fragmentation; DNase; Eucommia ulmoides Oliv; programmed cell death; terminal bud senescence; sympodium;
D O I
暂无
中图分类号
Q25 [细胞生理学];
学科分类号
071009 ; 090102 ;
摘要
Eucommia ulmoides Oliv. is a typical sympodial branching tree. The apical bud of the branch ages and dies every year, replaced by the nearby axillary bud in the second year. Structural assays and a series of biochemical analyses were performed to analyze the senescence mechanism in the apical bud. It was revealed that most cells of the apical bud underwent the programmed cell death (PCD) during the senescence: the chromosomes were congregated and the nuclear contents were condensed, as shown by 4′,6-diamidino-2-phenylindole (DAPI) fluorescence. DNA fragmentation was detected during senescence using the terminal deoxynucleotidyl transferase (TdT)-mediated dUTP nick end in situ labeling (TUNEL) method, coincident with the appearance of a DNA ladder. Moreover, a 20 kD DNase related to fragmentation was found. PCD was initiated first in the young leaves, leaf primordia and peripheral zone cells, then in the central mother cells and initial layer cells in the apical meristem. The terminal buds remain in vegetative growth during senescence, in contrast to buds of many annual plants.
引用
收藏
页码:46 / 51
页数:6
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