该miR319/bHLH094模块通过调节auxin生物合成和信号通路来调节爬行草的耐热性
Kangting Dong1, Chang Liu1, Mingyue Wang1
1College of Agronomy/State Key Laboratory of North China Crop Improvement and Regulation//Key Laboratory of Crop Growth Regulation of Hebei Province, Hebei Agricultural University, Baoding, Hebei, People's Republic of China.
Plant biotechnology journal
|January 27, 2026
概括
微RNA319通过降低AsbHLH094基因的调节,对爬行草的耐热性产生负面影响. 这种调节模块影响了辅酶通路,影响了植物对高温的反应.
科学领域:
- 植物科学 植物科学
- 分子生物学分子生物学
- 压力生理学 压力生理学
背景情况:
- 已知MicroRNA319 (miR319) 调节植物发育和干旱和盐等应激反应.
- miR319在耐热性,特别是冷季草中的特定作用尚不清楚.
研究的目的:
- 研究miR319在爬行草 (Agrostis stolonifera) 的耐热性中的作用.
- 确定miR319的目标基因并阐明热反应的潜在分子机制.
主要方法:
- 使用过度表达miR319 (OE319) 的转基因爬行草系识别miR319目标基因 (AsbHLH094).
- 转基因烟草植物中AsbHLH094的功能性特征.
- 蛋白质与蛋白质相互作用测试用于研究与Aux/IAA蛋白质的相互作用.
- 转录组分析以评估辅酶生物合成和信号通路的变化.
- 测量内源性英多尔-3-酸 (IAA) 含量和评估外源性IAA应用效应.
主要成果:
- miR319在爬行曲草中负面调节了耐热性.
- AsbHLH094,一个bHLH转录因子,被确定为miR319的直接标,其表达在OE319线下调节.
- 过度表达AsbHLH094增强了转基因烟草的耐热性.
- AsbHLH094与辅酶信号组成部分AsIAA1.1.相互作用.
- OE319植物显示了下调的奥素生物合成和响应基因,导致奥素积累减少.
- AsbHLH094烟草中的过度表达诱导了与辅酶相关的基因表达和增加的辅酶水平.
- 高温增加了爬行草中的内源性IAA水平,外源性IAA提高了耐热性.
结论:
- 在爬行草中发现了一种新的miR319-AsbHLH094调节模块.
- 该模块调节auxin生物合成和信号通路,以促进热应激反应.
- 了解这一机制,可以了解改善寒冷季节草的耐热性.
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