植物miRNAs影响土壤细菌生长和氨基酸吸收,重组社区组成
Jessica A Dozois1, Marc-Antoine Duchesne1, Katel Hallaf1
1Institut National de la Recherche Scientifique, Centre Armand-Frappier Santé Biotechnologie, Laval, QC, H7V 1B7, Canada.
ISME communications
|November 28, 2025
概括
植物miRNAs调节土壤微生物的氨基酸使用,影响社区的组成和生长. 这些发现揭示了营养循环中的新型植物微生物相互作用,影响土壤生态系统.
科学领域:
- 植物与微生物的相互作用
- 分子生物学分子生物学
- 土壤科学 土壤科学
背景情况:
- 植物和土壤微生物在竞争必需的土壤氨基酸.
- 众所周知,植物微RNA (miRNA) 能够影响参与氨基酸代谢和运输的基因.
- 植物衍生的miRNAs在塑造土壤微生物群落及其功能中的作用在很大程度上仍未被探索.
研究的目的:
- 为了研究植物根 miRNA 含量如何因氨基酸受精而发生变化.
- 确定特定植物miRNAs对土壤微生物社区生长,组成和氨基酸消耗的影响.
- 阐明植物miRNAs影响微生物氨基酸吸收和利用的机制.
主要方法:
- 阿拉比多普西斯塔利亚纳被用17种氨基酸的混合物受精,以分析根 miRNA 表达.
- 丰富于树叶球的植物miRNA被应用于各种氨基酸来源的简化土壤微生物群落.
- 使用分子和生物化学技术量化了微生物生长,社区组成和氨基酸消耗.
- 进一步研究了孤立的细菌种群,以评估植物miRNAs对其生长和氨基酸代谢的直接影响.
主要成果:
- 阿拉比多普西斯的根miRNA概况因氨基酸受精而显著改变.
- 植物miRNAs调节了土壤微生物群落的生长,超过70%的测试氨基酸来源.
- 植物miRNAs对微生物群落的影响取决于可用的源,而L-lysine显示出最强的影响.
- 发现特定的miRNA,ath-miR159a,可以抑制微生物消耗L-lysine,这表明它对氨基酸吸收有直接影响.
- 植物miRNA显著改变了细菌种类的相对丰富性,影响了分离体的生长和氨基酸消耗.
结论:
- 树球植物miRNAs在调节土壤细菌氨基酸消耗方面发挥着至关重要的作用.
- 植物miRNA可以重塑土壤微生物社区的结构和功能,不总是以竞争的方式.
- 这些发现突出了一个新的调节途径,即植物通过miRNA信号传递影响土壤营养动态.
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