衰老
WRKY蛋白质结构域
生物
细胞生物学
转录因子
信号转导
营养感应
转录组
基因表达
基因
遗传学
作者
Yongfeng Guo,Susheng Gan
出处
期刊:Current Topics in Developmental Biology
日期:2005-01-01
卷期号:: 83-112
被引量:252
标识
DOI:10.1016/s0070-2153(05)71003-6
摘要
Leaf senescence is a type of postmitotic senescence. The onset and progression of leaf senescence are controlled by an array of external and internal factors including age, levels of plant hormones/growth regulators, and reproductive growth. Many environmental stresses and biological insults such as extreme temperature, drought, nutrient deficiency, insufficient light/shadow/darkness, and pathogen infection can induce senescence. Perception of signals often leads to changes in gene expression, and the upregulation of thousands of senescence-associated genes (SAGs) causes the senescence syndrome: decline in photosynthesis, degradation of macromolecules, mobilization of nutrients, and ultimate cell death. Identification and analysis of SAGs, especially genome-scale investigations on gene expression during leaf senescence, make it possible to decipher the molecular mechanisms of signal perception, execution, and regulation of the leaf senescence process. Biochemical and metabolic changes during senescence have been elucidated, and potential components in signal transduction such as receptor-like kinases and MAP kinase cascade have been identified. Studies on some master regulators such as WRKY transcription factors and the senescence-responsive cis element of the senescence-specific SAG12 have shed some light on transcriptional regulation of leaf senescence.
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