Regulatory Cross-Talks and Cascades in Rice Hormone Biosynthesis Pathways Contribute to Stress Signaling.
Regulatory Cross-Talks and Cascades in Rice Hormone Biosynthesis Pathways Contribute to Stress Signaling.
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DOI：
10.3389/fpls.2016.01303
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发表时间：
2016
影响因子：
5.6
通讯作者：
Kundu S
中科院分区：
文献类型：
--
作者：
Deb A;Grewal RK;Kundu S
不同激素信号通路之间的串扰在调节植物对生物和非生物胁迫的反应中起着重要作用。激素的活性受其生物利用度的控制，而生物利用度又受其生物合成的影响。因此，必须对独立的激素生物合成途径进行调控和协调，以实现综合反应。其中一种可能性是使用顺式调控元件来协调激素生物合成基因的表达。对稻瘟病菌侵染和干旱胁迫下水稻叶片激素生物合成相关基因差异表达相关基因Cres的分析，使我们能够在转录水平上深入了解激素生物合成途径之间的相互作用。我们确定了一些主要的转录调控因子，它们在胁迫下协调不同的激素生物合成途径。我们发现脱落酸和油菜素类固醇调节细胞分裂素的结合；反之，油菜素类固醇的生物合成同时受脱落酸和细胞分裂素的影响。茉莉酸和乙烯的生物合成可能受脱落酸通过DREB转录因子调节。茉莉酸或水杨酸的生物合成途径是共同调节的，但它们不太可能直接影响彼此的生产。因此，多种激素可能通过一个复杂的调控网络调节激素的生物合成途径，其中一种激素的生物合成受到其他几种激素的影响。
Crosstalk among different hormone signaling pathways play an important role in modulating plant response to both biotic and abiotic stress. Hormone activity is controlled by its bio-availability, which is again influenced by its biosynthesis. Thus, independent hormone biosynthesis pathways must be regulated and co-ordinated to mount an integrated response. One of the possibilities is to use cis-regulatory elements to orchestrate expression of hormone biosynthesis genes. Analysis of CREs, associated with differentially expressed hormone biosynthesis related genes in rice leaf under Magnaporthe oryzae attack and drought stress enabled us to obtain insights about cross-talk among hormone biosynthesis pathways at the transcriptional level. We identified some master transcription regulators that co-ordinate different hormone biosynthesis pathways under stress. We found that Abscisic acid and Brassinosteroid regulate Cytokinin conjugation; conversely Brassinosteroid biosynthesis is affected by both Abscisic acid and Cytokinin. Jasmonic acid and Ethylene biosynthesis may be modulated by Abscisic acid through DREB transcription factors. Jasmonic acid or Salicylic acid biosynthesis pathways are co-regulated but they are unlikely to influence each others production directly. Thus, multiple hormones may modulate hormone biosynthesis pathways through a complex regulatory network, where biosynthesis of one hormone is affected by several other contributing hormones.