当前位置:首页>农业>华南农业大学唐明/陈辉研究团队揭示AM真菌协同根际代谢与微生物组提升牧草耐逆性的机制

华南农业大学唐明/陈辉研究团队揭示AM真菌协同根际代谢与微生物组提升牧草耐逆性的机制

  • 2026-02-07 00:58:10
华南农业大学唐明/陈辉研究团队揭示AM真菌协同根际代谢与微生物组提升牧草耐逆性的机制

多年生黑麦草(Lolium perenne L.)是一种重要的牧草和草坪植物,同时在生物能源和生物化工原料领域具有应用潜力。然而,极端高温和低温胁迫严重限制了其生长表现和生产稳定性,尤其在气候变化背景下,这一问题日益突出。丛枝菌根真菌(arbuscular mycorrhizal fungi,AMF)能够与大多数陆生植物形成共生关系,在改善养分吸收、增强抗逆性方面具有重要作用,被认为是一种低投入、环境友好型的农业管理手段。尽管已有研究表明 AMF 可缓解温度胁迫,但其如何在器官代谢、根系分泌物调控及根际微生物群落组装之间建立系统性联动机制,仍缺乏清晰认识。

华南农业大学唐明教授、陈辉教授研究团队围绕多年生黑麦草在极端温度条件下的适应机制,在Industrial Crops and Products发表了题为 “Rhizophagus irregularis inoculation reshapes root exudates, metabolomes and rhizosphere microbiomes to enhance perennial ryegrass adaptation under heat and cold stress” 的研究论文。该研究通过整合代谢组学、根际微生物组测序及土壤理化与酶学分析,系统解析了 Rhizophagus irregularis 接种在高温和低温胁迫下调控植物—土壤—微生物互作网络的作用机制。

主要研究结果如下:

(1)AM真菌稳定多年生黑麦草生长与土壤养分状态:在高温和低温胁迫条件下,AM真菌接种显著缓解了多年生黑麦草的生长抑制,维持了光合作用效率和抗氧化状态。同时,AM真菌显著提高了土壤中有效磷、铵态氮含量,并增强了碳氮循环相关酶活性,为植物耐逆性提供了养分与代谢基础。

(2)高温胁迫下呈现“以根系为核心”的代谢调控模式:在高温条件下,AM真菌主要驱动根系代谢重编程。多种氨基酸(如脯氨酸、天冬酰胺)显著积累,部分有机酸(如奎尼酸、半乳糖醛酸)发生重新分配,同时根系甾醇类和长链脂质含量上升。与之相应,根系分泌物中糖类释放减少,而含氮代谢物比例升高,有助于招募有益微生物并优化根际环境。

(3)低温胁迫下形成“以地上部为主导”的糖代谢响应:在低温条件下,AM真菌主要增强地上部代谢调控。蔗糖、葡萄糖、果糖和海藻糖等可溶性糖在地上部显著积累,同时伴随有机酸和膜相关脂质增加,有助于维持细胞结构稳定性。此时,根系分泌物向可溶性糖和含氮化合物倾斜,为根际微生物提供易利用碳源。

(4)AM真菌重塑根际微生物群落结构:在高温条件下,根际中 Bacillus、Massilia 以及真菌 Talaromyces、Trichoderma 和 Penicillium 的相对丰度显著提高;而在低温条件下,Bacillus 和 Pseudomonas 明显富集,同时 Fusarium 的相对丰度下降。这表明 AM真菌通过调控根系分泌物,定向招募有益微生物并抑制潜在病原。

(5)结构方程模型揭示“土壤—微生物—代谢”级联调控机制:结构方程模型(SEM)分析表明,AM真菌触发了由土壤理化性质改善,经由根系分泌物变化和微生物群落重组,最终作用于植物器官代谢的逐级调控通路。其中,高温耐受主要由根系代谢驱动,而低温耐受则更多依赖地上部代谢调控。

综上所述,该研究系统阐明了 AM真菌通过协调植物器官代谢、根系分泌物组成和根际微生物组装,增强多年生黑麦草耐高温和耐低温能力的机制。研究强调了 “不同胁迫条件下,耐逆性由不同器官代谢主导” 的调控模式,为深入理解植物—AM真菌—根际微生物协同适应极端环境提供了新视角。研究成果为草坪和牧草系统中应用 AM真菌实现低投入、环境友好型逆境管理提供了重要理论依据。

原文链接:https://www.sciencedirect.com/science/article/pii/S0926669026001123

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  1. CONNECT:[ UseTime:0.000422s ] mysql:host=127.0.0.1;port=3306;dbname=h_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000531s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.002547s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000277s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000491s ]
  6. SELECT * FROM `set` [ RunTime:0.000192s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000556s ]
  8. SELECT * FROM `article` WHERE `id` = 464056 LIMIT 1 [ RunTime:0.005809s ]
  9. UPDATE `article` SET `lasttime` = 1770861439 WHERE `id` = 464056 [ RunTime:0.005197s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000276s ]
  11. SELECT * FROM `article` WHERE `id` < 464056 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.008288s ]
  12. SELECT * FROM `article` WHERE `id` > 464056 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.014030s ]
  13. SELECT * FROM `article` WHERE `id` < 464056 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.013274s ]
  14. SELECT * FROM `article` WHERE `id` < 464056 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.077249s ]
  15. SELECT * FROM `article` WHERE `id` < 464056 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.054122s ]
0.250947s