干旱的微生物记忆重塑根相关群落,增强植物的抗灾能力。

IF 6.3 1区 生物学 Q1 PLANT SCIENCES
Hongyin Qi, Xin Wen, Ziyue Wang, Shuxia Yin
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引用次数: 0

摘要

全球气候变化增加了干旱的频率和严重程度,对草原生态系统构成了重大威胁。羊草(Leymus chinensis)是中国北方草原草甸草原的优势种,具有良好的抗旱性,但其抗旱性与根际微生物群落的相互作用机制尚不清楚。本研究模拟短期干旱周期(0-3),结合高通量测序和微生物移植实验,研究根际和土壤微生物对干旱的响应及其对宿主抗旱性的调控作用。主要发现包括:(1)3个干旱周期(R3)根际微生物网络连通性比对照(R0)下降63.3%,而土壤体积仅下降11.6%,表现出生态位特异性适应;(2)真菌群落对短期干旱胁迫反应迅速,而细菌(如变形杆菌)类群在连续干旱周期中表现出延迟但特定的招募模式,表明存在时间解决的功能协同作用;(3)移栽R3根际土壤提高了羊草相对水分、脯氨酸、叶绿素和可溶性糖含量,降低了相对电导率和丙二醛含量,验证了微生物介导的“胁迫记忆”效应。这些发现揭示了羊草通过瞄准根际微生物的招募来增强干旱适应能力,为草原的生态恢复和恢复提供了有价值的见解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Microbial Memory of Drought Reshapes Root-Associated Communities to Enhance Plant Resilience.

Global climate change has increased the frequency and severity of droughts, posing significant threats to grassland ecosystems. As a dominant species in meadow steppe in northern China's grasslands, Leymus chinensis exhibits excellent drought resistance, yet the interaction mechanisms between its drought resistance and rhizosphere microbial communities remain unclear. This study simulated short-term drought cycles (0-3) and combined high-throughput sequencing with microbial transplantation experiments to investigate rhizosphere and bulk soil microbial responses to drought and their regulatory effects on host drought resistance. Key findings include: (1) Rhizosphere microbial network connectivity decreased by 63.3% at 3 drought cycles (R3) versus control (R0), while bulk soil only decreased by 11.6%, showing niche-specific adaptation; (2) fungal communities responded rapidly to short-term drought stress, while bacterial (e.g., Proteobacteria) taxa exhibited delayed yet specific recruitment patterns across successive drought cycles, suggesting a time-resolved functional synergy; (3) transplanting R3 rhizosphere soil increased L. chinensis the content of relative water, proline, chlorophyll and soluble sugar, while reducing the relative conductivity and malondialdehyde content, validating the microbial-mediated 'stress memory' effect. These findings reveal that L. chinensis enhances drought adaptation by targeting the recruitment of rhizosphere microbes, providing valuable insights into the ecological resilience and restoration of grasslands.

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来源期刊
Plant, Cell & Environment
Plant, Cell & Environment 生物-植物科学
CiteScore
13.30
自引率
4.10%
发文量
253
审稿时长
1.8 months
期刊介绍: Plant, Cell & Environment is a premier plant science journal, offering valuable insights into plant responses to their environment. Committed to publishing high-quality theoretical and experimental research, the journal covers a broad spectrum of factors, spanning from molecular to community levels. Researchers exploring various aspects of plant biology, physiology, and ecology contribute to the journal's comprehensive understanding of plant-environment interactions.
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