Ethylene-gibberellin signaling underlies adaptation of rice to periodic flooding
Ethylene-gibberellin signaling underlies adaptation of rice to periodic flooding
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DOI：
10.1126/science.aat1577
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发表时间：
2018-07-13
期刊：
影响因子：
56.9
通讯作者：
Ashikari, Motoyuki
中科院分区：
文献类型：
--
作者：
Kuroh, Takeshi;Nagai, Keisuke;Ashikari, Motoyuki
大多数植物在淹水时长势不佳。某些水稻品种，被称为深水水稻，通过激活茎的节间生长以保持在水面之上，从而在周期性的洪水和随之而来的缺氧中生存下来。在这里，我们确定了赤霉素生物合成基因，SD1（SEMIDWARF 1），其功能丧失等位基因弹射水稻绿色革命，负责淹没诱导节间伸长。当被淹没时，携带深水水稻特异性SD1单倍型的植物放大了一个信号传递，其中SD1基因被乙烯响应转录因子OsEIL1a转录激活。SD1蛋白指导赤霉素的合成增加，主要是GA（4），其促进节间伸长。进化分析表明，深水水稻特有的单倍型来自野生稻的长期变异，并被选择用于孟加拉国的深水水稻栽培。
Most plants do poorly when flooded. Certain rice varieties, known as deepwater rice, survive periodic flooding and consequent oxygen deficiency by activating internode growth of stems to keep above the water. Here, we identify the gibberellin biosynthesis gene, SD1 (SEMIDWARF1), whose loss-of-function allele catapulted the rice Green Revolution, as being responsible for submergence-induced internode elongation. When submerged, plants carrying the deepwater rice-specific SD1 haplotype amplify a signaling relay in which the SD1 gene is transcriptionally activated by an ethylene-responsive transcription factor, OsEIL1a. The SD1 protein directs increased synthesis of gibberellins, largely GA(4), which promote internode elongation. Evolutionary analysis shows that the deepwater rice-specific haplotype was derived from standing variation in wild rice and selected for deepwater rice cultivation in Bangladesh.