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南京农业大学科研团队在 Glob Chang Biol. (Q1/12.1) 发文!破译跨作物保守根际代谢物 - 微生物互作抗旱机制

  • 2026-05-09 12:54:46
南京农业大学科研团队在 Glob Chang Biol. (Q1/12.1) 发文!破译跨作物保守根际代谢物 - 微生物互作抗旱机制
干旱胁迫是威胁全球粮食安全的重大逆境，不同作物能否通过保守策略招募有益根际微生物抵御干旱，一直是农业生态与微生物组领域的关键科学问题。近日，南京农业大学科研团队在全球变化领域顶级期刊Global Change Biology（IF=11.8，Q1）发表重要研究成果，在 26 种作物中鉴定出跨物种保守的抗旱核心微生物组，并揭示了根际代谢物驱动的级联招募机制，为研发广谱抗旱微生物组调控技术提供了全新路径。
可点击下方“阅读原文”获取原文内容
通讯作者及单位及邮箱
Jun Yuan
Jiangsu Provincial Key Lab for Organic Solid Waste Utilization, Jiangsu Collaborative Innovation Center for Solid Organic Wastes, Educational Ministry Engineering Center of Resource-Saving Fertilizers, Nanjing Agricultural University, Nanjing, China
Email: junyuan@njau.edu.cn
核心内容
结果 1：干旱下跨作物根际微生物组显著重构，鉴定出 6 大核心抗旱微生物属。研究整合全球 10 个国家 / 地区 26 种作物的 2757 个根际微生物样本，发现干旱显著改变根际细菌群落结构与多样性，放线菌门丰度显著上升。通过剔除土壤普遍响应类群、锁定植物主动招募类群，最终筛选出6 个在多种作物中稳定富集的核心抗旱微生物属：链霉菌属（Streptomyces）、糖霉菌属（Glycomyces）、Inquilinus、拟无枝酸菌属（Amycolatopsis）、不动杆菌属（Acinetobacter）、原小单孢菌属（Promicromonospora），这些类群是干旱下植物主动招募的关键功能核心。
结果 2：多种作物共享 46 种根际代谢物，3 种化合物协同富集核心微生物。团队对香蕉、黄瓜、西瓜、百合、番茄、玉米 6 种作物的根际代谢物进行解析，发现不同作物共享 46 种保守根际代谢物。土壤调控实验表明，海藻糖、肌醇、苯丙氨酸三种代谢物可精准靶向富集上述 6 个核心微生物属，其中海藻糖富集 4 个属、肌醇富集 Inquilinus、苯丙氨酸特异性富集不动杆菌属，三者组合可实现核心菌群的同步富集。
结果 3：核心微生物组显著提升多种作物抗旱性，温室与田间均获验证。将三种代谢物调控后的土壤微生物组回接番茄、黄瓜、西瓜温室植株与高粱田间作物，结果显示，接种微生物组的作物根系长度、叶片含水量显著提升，干旱损伤明显缓解，证明该保守微生物组具有跨作物广谱抗旱功能。
结果 4：核心微生物驱动抗旱功能通路，存在跨门级联招募新机制。宏基因组分析表明，6 个核心微生物富集了能量供应、保护物质合成、植物互作信号等 14 条抗旱相关代谢通路。纯培养实验证实，链霉菌可利用海藻糖合成苯丙氨酸，进而招募不动杆菌，形成放线菌门→变形菌门的跨门级联互作，稳定抗旱微生物组功能。
图解
图 1：干旱与正常条件下根际土壤细菌群落整体特征。a 展示全球干旱细菌群落测序样本的地理分布；b 为不同处理下土壤细菌群落 α 多样性分析；c 基于 Bray-Curtis 距离的主坐标分析，显示干旱与对照群落显著分离；d 为主要细菌门相对丰度柱状图；e 为对照与干旱根际土壤 37 个差异富集微生物属的雷达图；f 维恩图揭示根际与土体土壤干旱响应共有微生物属。
图 2：正常条件下土体与根际土壤细菌群落特征。a 为土体与根际土壤细菌群落 α 多样性；b 主坐标分析显示二者群落结构差异显著；c 弦图展示优势细菌门相对丰度；d 维恩图呈现土体与根际共有及特有微生物属；e 柱状图展示根际与土体富集微生物属；f 维恩图与丰度表锁定 6 个稳定定植的核心抗旱微生物属。
图 3：对照与干旱根际细菌微生物组网络拓扑与组装机制。a 为对照与干旱根际细菌群落共现网络分析；b 展示移除 6 个核心属后微生物组网络稳定性变化；c 中性模型分析估算细菌群落组装过程，揭示干旱下宿主选择主导微生物组重构。
图 4：不同根际代谢物对土壤微生物群落的影响及招募潜力。a 为不同代谢物处理下土壤细菌群落 α 多样性；b 优势细菌门相对丰度堆积柱状图；c 维恩图与 UpSet 图展示代谢物对 6 个核心微生物的招募能力；d 主坐标分析显示三种混合代谢物显著改变土壤细菌群落结构；e 火山图表明混合代谢物处理显著上调 6 个核心抗旱微生物。
图 5：三种混合代谢物抗旱效应验证。a 为番茄、黄瓜、西瓜三种作物在对照、干旱、微生物组 + 干旱处理下的表型；b 为三种作物根系长度表型；c、d 分别为三种作物叶片含水量与根系伸长统计；e 为混合代谢物处理土壤微生物基因多样性变化；f 主坐标分析展示微生物组功能特征差异；g 热图显示处理后富集的抗旱功能通路；h 检测链霉菌生物量与苯丙氨酸含量，证实其合成能力。
展望
本研究揭示了跨作物、保守性的根际代谢物 - 微生物抗旱互作机制，突破了传统微生物接种剂宿主特异性强、效果不稳定的瓶颈。未来可基于海藻糖 + 肌醇 + 苯丙氨酸的组合，研发广谱型根际微生物组调控制剂，适配小麦、玉米、蔬菜等多种作物，在干旱半干旱地区实现绿色抗旱增产。同时，研究也为整合真菌等其他微生物类群、优化代谢物配方、拓展全球不同土壤类型应用提供了重要方向，助力气候智慧型农业发展。
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  1. CONNECT:[ UseTime:0.000518s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000754s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000331s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000252s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000465s ]
  6. SELECT * FROM `set` [ RunTime:0.000196s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000492s ]
  8. SELECT * FROM `article` WHERE `id` = 539946 LIMIT 1 [ RunTime:0.000465s ]
  9. UPDATE `article` SET `lasttime` = 1779492483 WHERE `id` = 539946 [ RunTime:0.000991s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000218s ]
  11. SELECT * FROM `article` WHERE `id` < 539946 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000392s ]
  12. SELECT * FROM `article` WHERE `id` > 539946 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000342s ]
  13. SELECT * FROM `article` WHERE `id` < 539946 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001202s ]
  14. SELECT * FROM `article` WHERE `id` < 539946 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001288s ]
  15. SELECT * FROM `article` WHERE `id` < 539946 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001158s ]
0.076053s