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The Crop Journal | 南京农大揭示OsMAP4K6通过磷酸化OsMKK6正调控水稻耐盐性

  • 2026-03-22 12:14:59
The Crop Journal | 南京农大揭示OsMAP4K6通过磷酸化OsMKK6正调控水稻耐盐性

盐胁迫严重制约水稻生产。丝裂原活化蛋白激酶(MAPK)级联在植物盐胁迫应答中发挥核心作用,但其最上游的启动机制,尤其是MAP4K家族是否如动物中一样,能作为MAP3K的上游将信号传递至MAPK级联,在植物中仍是未解之谜。

近日,南京农业大学生命科学学院蒋明义教授团队在The Crop Journal在线发表了题为OsMAP4K6 positively regulates salt tolerance via activating OsMKK6 in rice”的研究论文,该研究首次完整克隆并解析了水稻MAP4K家族成员OsMAP4K6,系统阐明了其通过直接磷酸化OsMKK6正调控水稻耐盐性的全新机制,为阐明植物盐胁迫信号网络的早期激活机制提供借鉴。

研究者证实,OsMAP4K6是定位于细胞质与细胞膜的功能性激酶,且盐胁迫能快速诱导其基因表达及激酶活性,表明它是盐信号的早期响应元件。通过构建遗传材料,进一步证实OsMAP4K6正向调控水稻耐盐性:过表达株系存活率高、氧化损伤轻,而敲除突变体则表现为盐敏感(图1)。机制研究表明,OsMAP4K6通过增强根系Na+外排、抑制K+外流,有效维持盐胁迫下的离子稳态(图2)。最为关键的是,OsMAP4K6能够在体内外直接与OsMKK6互作,并特异性磷酸化其第13位丝氨酸(Ser13),而该位点的磷酸化是盐胁迫下充分激活OsMKK6激酶活性的必要条件(图3)。遗传证据表明,OsMKK6在耐盐性调控中与OsMAP4K6功能相似。综上所述,该研究首次将水稻MAP4K激酶(OsMAP4K6)置于盐胁迫信号通路的上游,并建立了其与MAPK级联成员(OsMKK6)的直接调控联系,深化了对植物耐盐信号网络的理解,为培育耐盐水稻新品种提供了重要的基因资源和理论依据。

1 OsMAP4K6正调控耐盐性及其激酶活性响应

2 OsMAP4K6调控盐胁迫下根系离子稳态

3 OsMAP4K6磷酸化OsMKK6 Ser13并激活其激酶活性

作者和基金项目

南京农业大学生命科学学院任宁博士为该文第一作者,蒋明义教授为通信作者。该研究得到国家自然科学基金项目(32170316,32372038)与江苏省研究生科研与实践创新计划(KYCX24_0923)的资助。

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The pepper MAP4K kinase CaMAP4K3 negatively regulates drought resistance

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  1. CONNECT:[ UseTime:0.000934s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001726s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000722s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000669s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001278s ]
  6. SELECT * FROM `set` [ RunTime:0.000508s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001564s ]
  8. SELECT * FROM `article` WHERE `id` = 483621 LIMIT 1 [ RunTime:0.001123s ]
  9. UPDATE `article` SET `lasttime` = 1775432068 WHERE `id` = 483621 [ RunTime:0.003715s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000590s ]
  11. SELECT * FROM `article` WHERE `id` < 483621 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001171s ]
  12. SELECT * FROM `article` WHERE `id` > 483621 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001138s ]
  13. SELECT * FROM `article` WHERE `id` < 483621 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.007872s ]
  14. SELECT * FROM `article` WHERE `id` < 483621 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003580s ]
  15. SELECT * FROM `article` WHERE `id` < 483621 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.008308s ]
0.201425s