Role of HY5 in abscisic acid response in seeds and seedlings
Role of HY5 in abscisic acid response in seeds and seedlings
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DOI：
10.4161/psb.6185
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发表时间：
2008-01-01
影响因子：
2.9
通讯作者：
Xiong, Liming
中科院分区：
文献类型：
--
作者：
Chen, Hao;Xiong, Liming
种子休眠为植物提供了适应性优势，这对于它们在土地上的成功殖民至关重要。从休眠种子转变为光合自养幼苗的决定是内部激素信号和外部刺激（例如水、温度和光）复杂相互作用的结果。我们最近发现，HY5 是光信号通路中一个已被充分表征的成分，它也在拟南芥种子萌发、早期幼苗生长和根发育过程中介导脱落酸 (ABA) 反应。我们提出 HY5 部分通过直接激活转录因子基因 ABI5 来调节这些 ABA 反应。通过分析 hy5 和 abi5 单突变体和双突变体的过早发芽，我们证明 HY5 还可能通过直接激活 ABI5 基因来积极控制种子成熟和休眠。光调节种子发育和发芽的对比作用对于植物对环境的适应可能很重要。
Seed dormancy offers plants an adaptive advantage that is crucial to their successful colonization of land. The decision to make the transition from a dormant seed to a photoautotrophic seedling is a result of a complex interaction of internal hormonal signals and external stimuli such as water, temperature and light. We recently showed that HY5, a well-characterized component in the light signaling pathway, also mediates abscisic acid (ABA) response during seed germination, early seedling growth and root development in Arabidopsis. We proposed that HY5 regulates these ABA responses partly by directly activating the transcription factor gene ABI5. By analyzing the premature germination of hy5 and abi5 single and double mutants, here we demonstrated that HY5 also positively controls seed maturation and dormancy, likely through direct activation of the ABI5 gene. The contrasting role of light regulation of seed development and germination may be important for the adaptation of plants to the environment.