Synergistic interplay of ABA and BR signal in regulating plant growth and adaptation
Synergistic interplay of ABA and BR signal in regulating plant growth and adaptation
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ABA 和 BR 信号在调节植物生长和适应中的协同相互作用。
DOI：
10.1038/s41477-021-00959-1
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发表时间：
2021-07-05
期刊：
影响因子：
18
通讯作者：
Tang, Jiuyou
中科院分区：
文献类型：
--
作者：
Li, Qianqian;Xu, Fan;Tang, Jiuyou
脱落酸(ABA)和油菜素类固醇(BR)信号通路之间复杂的拮抗作用已被广泛报道。然而，ABA是否或如何在植物中与BR协同作用仍有待阐明。在这里，我们报道了低浓度但不是高浓度的ABA增加了水稻幼苗的叶片关节倾斜，这需要功能的BR生物合成和信号转导。转录组分析证实，大约60%的低浓度ABA早期反应基因可以被BR以相同的方向调控。ABA以一种快速、有限和短期的方式激活BR信号，而BR生物合成调节基因OsGSR1在这一过程中起着关键作用，它的表达受ABA通过转录因子ABI3轻微诱导。此外，BR信号的早期短期激活在ABA介导的耐盐性中也是重要的。有趣的是，BR信号的短期激活过程和效果被高浓度的ABA所覆盖，这意味着植物存在适应不同程度胁迫的机制。油菜素类固醇(BR)和脱落酸(ABA)的信号通路通常是相互拮抗的。这表明BR和ABA还可以协同作用，在水稻植株的发育和耐盐性中发挥作用。
Complex antagonistic interactions between abscisic acid (ABA) and brassinosteroid (BR) signalling pathways have been widely documented. However, whether or how ABA interacts synergistically with BR in plants remains to be elucidated. Here, we report that low, but not high, concentration of ABA increases lamina joint inclination of rice seedling, which requires functional BR biosynthesis and signalling. Transcriptome analyses confirm that about 60% of low-concentration ABA early response genes can be regulated by BR in the same directions. ABA activates BR signal in a fast, limited and short-term manner and the BR-biosynthesis regulatory gene, OsGSR1, plays a key role during this process, whose expression is induced slightly by ABA through transcriptional factor ABI3. Moreover, the early short-term BR signal activation is also important for ABA-mediated salt stress tolerance. Intriguingly, the process and effect of short-term BR signal activation were covered by high concentration of ABA, implying adaptive mechanisms existed in plants to cope with varying degrees of stress.Brassinosteroids (BR) and abscisic acid (ABA) signalling pathways are mostly known to antagonize each other. Here, it is shown that BR and ABA can also interact synergistically, which plays a role in development and salt stress tolerance of rice plants.