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Molecular Plant∣华中农业大学发文揭示水稻逃旱的遗传和分子...

已有 2194 次阅读 2018-1-22 10:25 |系统分类:论文交流

2018年1月19日,Molecular Plant发表了题为“Integrative Regulation of Drought Escape through ABA Dependent and Independent Pathways in Rice”的文章。


该文章为华中农业大学熊立仲教授课题组完成。


目前对植物的抗旱已有很深入的研究,植物的抗旱包括避旱,耐旱,逃旱和复原抗旱性。而对于植物逃旱性的遗传和分子机制目前还不清楚。


本文的研究结果证明了水稻的逃旱性是通过生殖转变过程中的多种途径协调调控。即通过依赖ABA和不依赖ABA的途径共同调控。揭示了水稻逃旱性新的机制,为作物的抗旱研究提供了新的观点。


摘要:

在面临缺水的情况下,许多植物形成了逃旱(DE)机制,以缩短它们的生命周期。尽管对耐旱性已进行深入的研究,但DE的遗传和分子机制仍然不清楚。我们发现,在水稻发育早期低水分亏缺处理(LWT)可以触发早花和减少分蘖数量。LWT诱导了ABA的积累,反过来又通过同步调节许多与开花有关的基因,反馈影响了光感知和生物钟,从促进开花而。此外,发现一些光受体,昼夜节律组分和包括OsTOC1,Ghd7和PhyB的开花相关基因,它们以依赖ABA的方式参与LWT,而其他一些开花相关基因包括OsGI,OsELF3 ,OsPRR37和OsMADS50则参与调控不依赖于ABA的DE。此外,我们发现在LWT条件下,独脚金内酯和OsTB1参与了的分蘖抑制,这与水稻的开花途径无关。综上所述,我们的研究结果提供了令人信服的证据,证明水稻中的DE,是通过生殖(开花)转换中的多种途径协调调节的。


Abstract:

Many plants have evolved a drought escape (DE) mechanism to shorten their life cycle when facing water-deficit conditions. While drought tolerance has been intensively investigated, the genetic and molecular mechanisms of DE remain elusive. We found that low water-deficit treatment (LWT) at the early stage of rice development can trigger early flowering and reduced tiller numbers. LWT induced the accumulation of ABA which in turn feedback affected the light perception and circadian clock by synchronously regulating many flowering-related genes to promote early flowering. Moreover, some of the light receptors, circadian components, and flowering-related genes including OsTOC1, Ghd7, and PhyB were found to be involved in LWT in an ABA-dependent manner, whereas some of the other flowering-related genes including OsGI, OsELF3, OsPRR37, and OsMADS50 were involved in the regulation of DE independent of ABA. In addition, we found that strigolactones and OsTB1 are involved in the tillering inhibition under LWT, which is independent of the flowering pathway in rice. Taken together, our findings provide compelling evidence that DE in rice is coordinately regulated by multiple pathways in the reproduction (flowering) switch.


Schematic model of regulatory interactions 869 in the DE pathway in rice







https://blog.sciencenet.cn/blog-634883-1096160.html

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