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科研进展丨山东农业大学破解植物“磷”危自救机制

  • 2026-05-13 04:35:18
科研进展丨山东农业大学破解植物“磷”危自救机制

磷是支撑植物生长发育的必需大量元素,然而土壤中可直接吸收利用的无机磷普遍匮乏,已成为限制作物生长与产量提升的关键瓶颈。面对低磷胁迫,植物自身有一套“自救办法”——启动磷饥饿响应(PSR)程序,而磷酸盐饥饿响应转录因子 PHRs 是调控该通路的核心“总开关”。但长期以来,植物如何精细调控 PHRs 转录活性、实现磷信号精准应答的分子机制,始终是植物营养学领域亟待破解的空白。

近日,《植物学报(英文版)》(Journal of Integrative Plant Biology)在线发表了山东农业大学生命科学学院李传友课题组最新研究成果“SlMED25-SlPHR3-SlSPX2 module Fine-Tunes SlPHR3-Mediated Transcriptional Activation of Phosphate Starvation Response in Tomato”。研究以番茄为研究体系,成功揭示了磷饥饿响应转录因子的精准调控机制,填补了植物磷信号精准调控的理论空白,为作物磷高效利用育种提供了关键基因靶点与技术支撑。

番茄是全球产量最高的蔬菜作物,在国民经济中具有重要地位,其生长对磷的需求尤为迫切。因此,明确磷信号精准应答机制,培育少施磷肥、高产稳产的番茄新品种,对于推动农业节本增效、保障农业生产稳定具有重要的现实意义。

图1 SlMED25 将RNA聚合酶II(Pol II)招募到SlPHR3的靶基因启动子区

图2 SlMED25-SlPHR3-SlSPX2调控番茄磷饥饿响应的工作模型

研究团队通过遗传学和生化手段证实,SlPHR3 是番茄调控磷饥饿响应的关键枢纽,主导番茄应对低磷环境的一系列生理应答。研究进一步发现,这一关键枢纽的活性受到两个因子的精准调控——共激活因子SlMED25和共抑制因子SlSPX2,三者共同构成了一套精准的磷饥饿响应“分子开关”:细胞内磷充足时,SlSPX2 优先结合 SlPHR3,关闭响应通路;磷匮乏时,SlMED25 竞争性结合 SlPHR3,启动应答程序,实现磷信号的动态、精准调控。

“当前农业生产过度依赖磷肥,不仅面临磷矿资源枯竭的危机,还易引发水体富营养化等环境问题,培育磷高效利用的作物新品种已成为农业可持续发展的迫切需求。”论文通讯作者李传友教授介绍,团队长期致力于植物系统性防御与可塑性发育研究,下一步将聚焦培育少施磷肥、高产稳产的番茄新品种,助力减少农业面源污染,推动绿色高效农业发展,为国家粮食安全提供科技保障。

山东农业大学在站博士后翟铭通、韩鸿宇,已毕业博士研究生赵云峰和硕士研究生张玉为该论文共同第一作者,山东农业大学李传友教授和北京农学院陈谦教授为共同通讯作者。该研究获得国家重点研究发展计划、国家自然科学基金委员会、青岛市科技惠民示范项目、山东-国家基金委联合基金的资助。

文章链接:

https://onlinelibrary.wiley.com/doi/10.1111/jipb.70278

来源:山东农业大学
编辑:李钲宇
校对:王健运
审核:周传波

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  1. CONNECT:[ UseTime:0.000466s ] mysql:host=127.0.0.1;port=3306;dbname=h_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000675s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.007643s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.003997s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000687s ]
  6. SELECT * FROM `set` [ RunTime:0.008039s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000737s ]
  8. SELECT * FROM `article` WHERE `id` = 527657 LIMIT 1 [ RunTime:0.005942s ]
  9. UPDATE `article` SET `lasttime` = 1778680297 WHERE `id` = 527657 [ RunTime:0.006249s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000669s ]
  11. SELECT * FROM `article` WHERE `id` < 527657 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.004686s ]
  12. SELECT * FROM `article` WHERE `id` > 527657 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002290s ]
  13. SELECT * FROM `article` WHERE `id` < 527657 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.011596s ]
  14. SELECT * FROM `article` WHERE `id` < 527657 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.016937s ]
  15. SELECT * FROM `article` WHERE `id` < 527657 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.007942s ]
0.156156s