Gibberellic acid-mediated salt signaling in seed germination
Gibberellic acid-mediated salt signaling in seed germination
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DOI：
10.4161/psb.3.10.6247
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发表时间：
2008-01-01
影响因子：
2.9
通讯作者：
Park, Chung-Mo
中科院分区：
文献类型：
--
作者：
Kim, Sang-Gyu;Park, Chung-Mo
种子萌发启动植物的胚后发育，这决定了成功的幼苗建立和植物繁殖。因此，它受到不同环境条件的严格调控，包括高盐度和干旱，以及内在的发育程序，其中赤霉酸（GA）是最好的理解。GA在种子萌发中的调节作用已被广泛研究。还已知高盐度通过抑制编码GA生物合成酶的基因来抑制萌发。然而，目前还不清楚盐信号是如何在分子水平上协调地并入GA信号通路的。我们最近证明，膜结合的NAC转录因子，NTL 8，介导的盐信号，主要是通过RGL 2-独立的GA途径，在调节种子萌发。高盐度促进NTL 8的转录和蛋白水解激活。值得注意的是，NTL 8介导的盐信号传导不依赖于脱落酸（阿坝）。这些观察结果表明，膜介导的转录控制是种子萌发过程中的盐信号的重要组成部分。
Seed germination initiates the postembryonic development of plants, which determines successful seedling establishment and plant propagation. It is therefore tightly regulated by diverse environmental conditions, including high salinity and drought, as well as by intrinsic developmental programs, among which gibberellic acid (GA) is best understood. Regulatory roles of GA in seed germination have been extensively studied. It is also known that high salinity inhibits germination by repressing genes encoding GA biosynthetic enzymes. However, it is still unclear how salt signals are coordinately incorporated into the GA signaling pathway at the molecular level. We recently demonstrated that a membrane-bound NAC transcription factor, NTL8, mediates salt signaling, primarily through a RGL2-independent GA pathway, in regulating seed germination. High salinity promotes NTL8 transcription and proteolytic activation of NTL8. Notably, the NTL8-mediated salt signaling is independent of abscisic acid (ABA). These observations indicate that membrane-mediated transcription control is an important component of salt signaling during seed germination.