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南京农业大学科研团队在J Integr Plant Biol(Q1/9.3)发文!解析水稻丛枝菌根硝酸盐吸收双重调控机制

  • 2026-04-16 05:41:14
南京农业大学科研团队在J Integr Plant Biol(Q1/9.3)发文!解析水稻丛枝菌根硝酸盐吸收双重调控机制
氮素是作物生长发育必需的大量元素,硝酸盐是旱地与水稻田有氧环境中植物主要吸收的氮素形态。超过 70% 的陆地植物可与丛枝菌根(AM)真菌形成互惠共生体系,构建根系直接吸收与菌根共生途径两套氮素获取系统。前期研究已鉴定水稻 AM 特异性硝酸盐转运蛋白 OsNPF4.5,但其在菌根中特异表达的调控机制尚未明确。近日,南京农业大学资源与环境科学学院团队在植物学顶级期刊Journal of Integrative Plant Biology(JIPB,Q1,IF=9.3) 在线发表题为 “Two mycorrhiza‐responsive MADS transcription factors, OsMADS61 and OsMADS26 regulate both direct and mycorrhizal nitrate transport pathways” 的研究论文,系统阐明两个 MADS 转录因子协同调控水稻直接与菌根硝酸盐吸收通路的分子机制,为作物氮高效利用与菌根共生改良提供关键理论与基因资源。
可点击下方“阅读原文”获取原文内容
通讯作者及单位
Aiqun Chen
State Key Laboratory of Crop Genetics and Germplasm Enhancement, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China;Key Laboratory of Plant Nutrition and Fertilization in Lower‐Middle Reaches of the Yangtze River, Ministry of Agriculture, Nanjing Agricultural University, Nanjing 210095, China
Email: chenaq8@njau.edu.cn
Shuangshuang Wang
State Key Laboratory of Tropical Crop Breeding, Institute of Tropical Bioscience and Biotechnology, Chinese Academy of Tropical Agricultural Sciences, Haikou 571100, China
Email: wangss945@126.com
核心研究结果
结果 1:CArG 与 GCC box 是 OsNPF4.5 在菌根根中激活的必需顺式元件。通过 OsNPF4.5 启动子截短与 GUS 报告系统,确定−295 至−202 bp 区域为菌根诱导表达核心区段。该区域含 MADS 结合基序 CArG(CW8G)与 GCC box,单独缺失任一基序均导致启动子活性几乎完全丧失;四串联 CArG 重复可驱动 GUS 在丛枝细胞特异性表达。EMSA 与原生质体转化证明,CCaMK–CYCLOPS 复合物通过 GCC box 正调控 OsNPF4.5 转录,明确双顺式元件协同激活机制。
结果 2:OsMADS61 直接结合 CArG 基序正向调控 OsNPF4.5。从水稻 1588 个转录因子文库中,通过酵母单杂交筛选到 MADS 家族蛋白 OsMADS61。该基因受 AM 共生显著上调,定位于细胞核,在丛枝含体细胞中高表达。Y1H、EMSA、ChIP‑qPCR 与双荧光素酶实验一致证明,OsMADS61 通过 CArG 基序直接结合并激活 OsNPF4.5 启动子。敲除 OsMADS61 显著降低地上部生物量、氮积累量、菌根定殖率与丛枝丰度,同时下调 OsNPF4.5 表达,证实其正向调控菌根硝酸盐吸收。
结果 3:OsMADS61 调控非共生条件下根系生长与直接硝酸盐吸收。OsMADS61 主要在根中表达,短期硝酸盐处理呈瞬时响应。敲除突变体根生物量下降约 30%、根长缩短,高 / 低硝酸盐条件下地上部氮积累均显著降低;过表达株系生物量与氮含量大幅提升。RNA‑seq 与 qPCR 显示,OsMADS61 正向调控直接吸收通路关键基因 OsNRT2.2、OsNAR2.1 及氮代谢、根系生长相关基因,并直接结合 OsNRT2.2 启动子激活表达,兼具调控根系发育与直接硝酸盐吸收功能。
结果 4:OsMADS26 平行调控直接与菌根硝酸盐吸收通路。OsMADS26 同样受 AM 共生诱导,在丛枝细胞富集表达。Y1H、EMSA 与荧光素酶实验证明,OsMADS26 直接结合 OsNPF4.5、OsNRT2.2 与 OsNAR2.1 启动子并激活转录。敲除 OsMADS26 导致植株生长受抑、氮积累下降、菌根定殖与丛枝形成显著降低,靶基因表达下调,表型与 osmads61 相似,证明其独立调控双通路。
结果 5:OsMADS26‑OsMADS61 形成层级调控模块。osmads26/61 双突变体较单突呈现更显著的生长、氮积累与菌根定殖缺陷,OsNPF4.5 表达进一步下调。osmads26 突变体中 OsMADS61 表达显著下降;Y1H 与荧光素酶实验证实 OsMADS26 直接结合 OsMADS61 启动子并激活转录,形成OsMADS26→OsMADS61层级调控,协同放大对双硝酸盐吸收通路的调控效应。
图文解析
图 1:OsNPF4.5 不同启动子截短体在菌根根的 GUS 活性,证明−295 bp 片段足够驱动表达,CArG 缺失使活性丧失,4×CArG 可恢复表达,明确 CArG 为核心元件。
图 2:OsMADS61 通过 Y1H、EMSA、ChIP‑qPCR 与荧光素酶实验,直接结合并激活 OsNPF4.5 启动子,结合依赖 CArG 基序。
图 3:OsMADS61 组织表达以根为主,受 AM 共生诱导在丛枝细胞特异性增强,硝酸盐短期处理呈动态响应。
图 4:osmads61 突变体菌根条件下生物量、氮含量、菌根定殖率下降,OsNPF4.5 等靶基因表达下调,表型与 OsNPF4.5 突变体相似。
图 5:OsMADS61 敲除降低根生物量与氮积累,过表达显著提升生长与氮含量,调控直接硝酸盐吸收与根系生长。
图 6:osmads61 根 RNA‑seq 鉴定到氮转运、代谢及根系发育相关基因下调,qPCR 验证表达趋势。
图 7:OsMADS26 结合并激活 OsNPF4.5,在根与丛枝细胞特异表达,敲除导致生长、氮积累与菌根定殖缺陷。
图 8:OsMADS26 直接结合 OsNRT2.2、OsNAR2.1 与 OsMADS61 启动子并激活转录,构建层级调控。
图 9:工作模型,OsMADS26 与 OsMADS61 通过 CArG 调控 OsNPF4.5(菌根通路)及 OsNRT2.2/OsNAR2.1(直接通路),OsMADS26 上游调控 OsMADS61,CCaMK‑CYCLOPS 通过 GCC box 协同激活 OsNPF4.5。
研究展望
本研究揭示MADS 转录因子调控植物菌根硝酸盐吸收的分子机制,证明 OsMADS61 与 OsMADS26 以层级调控 + 平行调控模式,同时控制直接与菌根双硝酸盐吸收通路,完善水稻氮高效利用的调控网络。研究为通过分子育种改良 MADS 因子、协同提升作物氮利用效率与菌根共生效率提供关键靶点,对减肥增效、绿色农业生产具有重要应用价值。未来可聚焦该调控模块在小麦、玉米等大田作物的保守性,开发氮高效与菌根友好型作物新品种。

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  1. CONNECT:[ UseTime:0.000495s ] 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:0.000306s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.002370s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000528s ]
  6. SELECT * FROM `set` [ RunTime:0.002472s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000622s ]
  8. SELECT * FROM `article` WHERE `id` = 522701 LIMIT 1 [ RunTime:0.000414s ]
  9. UPDATE `article` SET `lasttime` = 1776615140 WHERE `id` = 522701 [ RunTime:0.002421s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.001068s ]
  11. SELECT * FROM `article` WHERE `id` < 522701 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000439s ]
  12. SELECT * FROM `article` WHERE `id` > 522701 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.007376s ]
  13. SELECT * FROM `article` WHERE `id` < 522701 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001597s ]
  14. SELECT * FROM `article` WHERE `id` < 522701 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.012018s ]
  15. SELECT * FROM `article` WHERE `id` < 522701 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.004884s ]
0.112723s