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Author:
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Year:
Volume:
Issue:
zhong zi meng fa de yi zhi diao kong ji zhi
Author(s):
ZHANG Yu
,
XU Xiao-Feng
,
MO Bei-Xin*
Pages:
118
-
122
Year:
2012
Issue:
2
Journal:
Chinese Bulletin of Life Sciences
Keyword:
seed
;
germination
;
repression
;
hormone
;
miRNA
;
mRNA compartamentaion
;
small RNA
;
Abstract:
种子萌发是植物生命周期中一个重要的生理过程,激素作用、miRNA抑制、mRNA区域化、表观遗传调控等多个层次的分子抑制参与该过程的调控。赤霉素(解除抑制的激素)合成和失活的调控主要发生在转录水平,而脱落酸(引起抑制的激素)信号转导途径的调控则通过蛋白质抑制物的降解来实现。miRNA在转录后水平使其靶基因的mRNA降解,抑制种子的萌发;通过mRNA的区域化抑制与萌发相关基因的翻译属于另一层次的转录后抑制;小RNA介导的表观遗传机制也可能在种子萌发过程基因表达的协同调控中发挥重要作用。与分子水平的抑制类似,胚乳和种皮产生的机械抑制也很重要。
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