BIL7通过调节在布拉西诺固醇信号传递过程中的转录因子BIL1/BZR1来增强植物生长
Tomoko Miyaji1, Ayumi Yamagami1,2, Yusuke Nakamura2
1RIKEN Center for Sustainable Resource Science, Wako, Saitama, 351-0198, Japan.
The Plant journal : for cell and molecular biology
|December 20, 2024
概括
BIL7通过促进BIL1/BZR1的核积累来增强植物生长,BIL1是巴西诺体 (BR) 信号传递中的关键转录因子. 这一发现揭示了BR监管的植物发展.
科学领域:
- 植物生物学 植物生物学
- 分子生物学分子生物学
- 激素信号传递 激素信号传递
背景情况:
- 铜类固醇 (BRs) 是关键的植物类固醇激素,调节发育和环境反应.
- 作为BR信号传输中的主转录因子BIL1/BZR1的核传输机制在很大程度上是未知的.
- 了解BR信号通路对于作物改良和农业应用至关重要.
研究的目的:
- 确定涉及BR信号和BIL1/BZR1.1.核传输的新型因素.
- 阐明BIL7在调节植物生长和BR反应中的作用.
- 研究BIL7影响BIL1/BZR1核积累的分子机制.
主要方法:
- 对BIL7过度表达和野生类型Arabidopsis thaliana的遗传分析.
- 对BIL7.7的细胞下局部化研究.
- 在体外激酶试验测试以通过BIN2.2确定BIL7酸化.
- 同免疫沉试验评估了BIL7-BIL1/BZR1的结合性.
- 对植物生长表型的分析,包括 hypocotyl 延长和细胞分裂.
主要成果:
- 过度表达BIL7增强了植物生长,赋予了对BR抑制剂的耐药性,并且由于细胞分裂而增加了高度.
- BIL7定位到等离子体膜和核中,通过BIN2抑制增强了核定位.
- BIL7直接与BIL1/BZR1结合,并大大促进了其核积累.
- 同时过度表达BIL1/BZR1和BIL7会导致明显的阴囊延长.
结论:
- BIL7 作为 BR 信号传输中的新型正调节器,调解了 BIL1/BZR1.1 的核导入.
- BIL7与BIL1/BZR1的相互作用对于激活参与植物生长的下游基因至关重要,特别是花延长.
- 这项研究揭示了一种新的机制,通过BIL7介导的BIL1/BZR1.1的核传输控制BR信号通路的激活.
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