当前位置:首页>农业>Microbiome| 南京农业大学韦中教授团队揭示代谢物驱动的根际微生物组装驱动当归抗根腐能力

Microbiome| 南京农业大学韦中教授团队揭示代谢物驱动的根际微生物组装驱动当归抗根腐能力

  • 2026-06-07 03:19:03
Microbiome| 南京农业大学韦中教授团队揭示代谢物驱动的根际微生物组装驱动当归抗根腐能力

研究背景

根际微生物群落是植物抵御土传病害的重要“第一道防线”。近年来,植物通过分泌次生代谢物调控根际微生物组装的研究不断深入,这些代谢物不仅作为碳源,还可作为信号分子,选择性富集有益微生物,从而增强植物抗逆能力。在药用植物中,这一过程尤为关键,因为其不仅影响植株健康,还直接关系到药用成分的积累与品质。

然而,目前仍缺乏对“代谢物驱动的微生物组装”如何具体决定植物抗病性的系统认识,尤其是在复杂土传病害(如镰刀菌引起的根腐病)背景下,植物—代谢物—微生物三者之间的协同机制尚不清晰。当归(Angelica sinensis)作为重要的中药材,其生产过程中常受根腐病严重制约。因此,解析其根际微生物组装机制,对于绿色防控和品质提升具有重要意义。

研究概况

近日,南京农业大学韦中教授团队在Microbiome发表了题为“Metabolome-driven rhizosphere microbiome assembly determining the health of medicinal herb (Angelica sinensis) against root rot”的论文,系统揭示了当归通过分泌关键脂质代谢物驱动根际微生物组装,从而抵御根腐病的机制。南京农业大学王孝芳副教授为该论文通讯作者。

主要研究结果

(1)病害土壤中关键微生物群落失衡:研究发现,根腐病发生的根际土壤(DRS)中Fusarium的相对丰度显著升高,而有益菌Streptomyces显著降低;相比之下,健康土壤(HRS)中链霉菌更为丰富,提示其在维持根际健康中发挥关键作用。

(2)功能基因富集揭示“代谢驱动”的微生物组装机制:宏基因组分析显示,健康土壤中代谢相关基因显著富集,尤其是甾体降解相关基因。这一结果表明,能够利用植物分泌甾体类物质的微生物在健康根际中更具竞争优势。进一步对链霉菌基因组分析发现,这些甾体代谢基因与其在根际的定殖能力密切相关。

(3)关键功能菌株直接拮抗病原并增强抗性:分离获得的链霉菌S15菌株不仅能够直接拮抗镰刀菌,还可显著增强当归根系抗病能力,表明其兼具“抑菌+促抗”的双重功能,是典型的关键功能菌(keystone taxa)。

(4)代谢组揭示脂质物质驱动有益菌富集:比较代谢组学分析表明,健康当归根系分泌更多脂质及类脂分子,特别是甾醇脂类和长链脂肪酸。这些物质显著促进链霉菌S15的生长,说明植物通过代谢物“定向喂养”有益菌,从而驱动微生物群落组装。

(5)转录组解析脂质信号调控微生物功能:转录组分析进一步表明,脂质类信号分子(如甲基茉莉酸和油菜素内酯)可调控链霉菌的孢子形成、生物膜构建以及链霉素合成等关键功能过程,从而增强其生态竞争力和抗病能力。

(6)“合生元”策略验证微生物调控潜力:通过外源施用“合生元”(脂质前生物质+S15菌株),显著富集了与S15同源的链霉菌ASV,并在镰刀菌胁迫下重建了有益微生物群落结构。这一结果为基于功能代谢物与有益菌协同调控的绿色防控策略提供了直接证据。

【图表概况】

结论

该研究从“代谢物—微生物—植物健康”的整合视角出发,提出当归通过分泌关键脂质信号(如甲基茉莉酸和油菜素内酯),主动招募具甾体代谢能力的链霉菌,从而抑制病原菌并增强自身抗病能力。这一机制不仅深化了对根际微生物组装过程的理解,也为药用植物病害绿色防控提供了新思路。特别是“合生元”(synbiotics)策略,即将功能代谢物与有益微生物协同应用,有望成为未来可持续农业的重要技术路径。

原文链接:https://link.springer.com/article/10.1186/s40168-026-02393-x

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本文由本公众号翻译,内容以原文为准,仅用于学术分享。若有侵权,请联系小编删除或修改!
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  1. CONNECT:[ UseTime:0.000516s ] mysql:host=127.0.0.1;port=3306;dbname=h_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000811s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000295s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000283s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000490s ]
  6. SELECT * FROM `set` [ RunTime:0.000201s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000545s ]
  8. SELECT * FROM `article` WHERE `id` = 514380 LIMIT 1 [ RunTime:0.003917s ]
  9. UPDATE `article` SET `lasttime` = 1781025819 WHERE `id` = 514380 [ RunTime:0.008337s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000321s ]
  11. SELECT * FROM `article` WHERE `id` < 514380 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000540s ]
  12. SELECT * FROM `article` WHERE `id` > 514380 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000400s ]
  13. SELECT * FROM `article` WHERE `id` < 514380 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.019939s ]
  14. SELECT * FROM `article` WHERE `id` < 514380 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.010963s ]
  15. SELECT * FROM `article` WHERE `id` < 514380 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.005728s ]
0.172662s