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Programmed cell death progressively models the development of anther sporophytic tissues from the tapetum and is triggered in pollen grains during maturation.

Abstract：

:To characterize the spatial and temporal occurrence of programmed cell death (PCD) in Lilium anther tissues, we used both microscopical and molecular markers of apoptosis for developmental stages from meiosis to pollen release. The first hallmarks of PCD include cell condensation and shrinkage of the cytoplasm, separation of chromatin into delineated masses, and DNA fragmentation in the tapetum as early as the premeiosis stage. PCD then extended to other anther sporophytic tissues, leading to anther dehiscence. Although the PCD clearly affected the endothecium and the epidermis, these two cell layers remained alive until anther dehiscence. In pollen, no sign of PCD was found until pollen mitosis I, after what apoptotic features developed progressively in the vegetative cell. In addition, DNA ladders were detected in all sporophytic tissues and cell types throughout pollen development, whereas in the male gametophyte DNA ladders were only detected during pollen maturation. Our data suggest that PCD is a progressive and active process affecting all the anther tissues, first being triggered in the tapetum.

journal_name

J Struct Biol

journal_title

Journal of structural biology

authors

Varnier AL,Mazeyrat-Gourbeyre F,Sangwan RS,Clément C

doi

10.1016/j.jsb.2005.07.011

keywords:

subject

Has Abstract

pub_date

2005-11-01 00:00:00

pages

118-28

issue

2

eissn

1047-8477

issn

1095-8657

pii

S1047-8477(05)00149-8

journal_volume

152

pub_type

杂志文章

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