当前位置:首页>南京>南京农业大学张亚丽教授团队在TOP期刊发表科研成果:转录因子OsPIL13通过调控油菜素内酯稳态调节水稻叶倾角

南京农业大学张亚丽教授团队在TOP期刊发表科研成果:转录因子OsPIL13通过调控油菜素内酯稳态调节水稻叶倾角

  • 2026-04-03 01:45:43
南京农业大学张亚丽教授团队在TOP期刊发表科研成果:转录因子OsPIL13通过调控油菜素内酯稳态调节水稻叶倾角

The transcription factor OsPIL13 regulates leaf inclination in rice by modulating brassinosteroid homeostasis文章发表在《Plant Physiology》。bHLH转录因子OsPIL13通过直接结合油菜素内酯(BR)合成关键基因OsDWF4的外显子E-box基序,激活其表达以调控水稻体内BR稳态,进而调控叶枕近轴细胞的纵向伸长,最终正向调节水稻叶倾角,该研究为通过精准调控BR含量优化水稻株型提供了分子机制与基因资源。

研究背景

水稻是全球超半数人口的主粮,直立叶型可提升冠层光合效率和光能利用率,是密植条件下提高水稻产量的重要株型特征,叶倾角由叶枕发育状态决定。BR是调控水稻叶倾角的核心激素,其合成与信号通路相关基因的突变会导致叶倾角变小,bHLH家族转录因子常通过BR通路调控叶倾角,但OsPILs(光敏色素互作因子类似蛋白)家族对水稻叶倾角的调控作用尚未见报道,解析其调控机制对水稻株型育种具有重要意义。

实验方法

以粳稻东津(WT)为实验背景,利用农杆菌转化构建OsPIL13过表达株系,通过CRISPR-Cas9技术获得ospil13纯合突变体及OsPIL13过表达背景下的osdwf4突变体;结合表型观察、细胞形态学切片与共聚焦显微镜分析,明确OsPIL13对叶枕细胞的调控作用;通过RT-qPCRGUS染色分析OsPIL13的时空表达模式,利用水稻原生质体瞬时表达验证其亚细胞定位;经BR2,4-epiBL)及BR合成抑制剂(BRZ)处理,分析转基因株系的激素响应特性;通过CUT&Tag筛选OsPIL13下游靶基因,结合EMSA、酵母单杂交、双荧光素酶报告系统及ChIP-qPCR验证其与靶基因的结合关系;采用HPLC-MS/MS检测叶枕中内源BRBL)含量,通过遗传互补实验验证OsDWF4的下游关键作用。

核心结果

OsPIL13正向调控水稻叶倾角,ospil13突变体叶倾角较野生型降低48%,过表达株系升高86%,该基因仅调控叶枕近轴细胞的纵向伸长,对远轴细胞无显著影响;

OsPIL13主要在水稻地上部(叶片、叶枕、小穗)表达,蛋白定位于细胞核,符合转录因子的功能特征;

OsPIL13过表达株系对BR更敏感、对BRZ响应更显著,证明其调控叶倾角依赖BR通路;

CUT&Tag筛选发现OsPIL13可结合OsDWF4外显子的E-box基序,且能直接激活其表达,ospil13突变体叶枕BL含量显著降低,过表达株系则升高;

敲除OsDWF4可显著降低过表达株系的叶倾角,恢复至接近野生型的表型,证实OsDWF4OsPIL13调控叶倾角的下游关键靶基因。

研究结论

OsPIL13作为正调控因子,通过OsDWF4介导的BR生物合成通路调控水稻体内BR稳态,进而调控叶枕近轴细胞的纵向伸长,最终影响水稻叶倾角;该研究揭示了OsPIL13调控水稻叶倾角的分子机制,明确了其与BR通路的调控关系,为水稻株型的分子设计育种提供了新的靶标基因,也为通过精准调控BR含量优化水稻密植产量潜力奠定了理论基础。

原文链接:

https://doi.org/10.1093/plphys/kiag024

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  1. CONNECT:[ UseTime:0.000622s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000976s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000376s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000309s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000601s ]
  6. SELECT * FROM `set` [ RunTime:0.000251s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000757s ]
  8. SELECT * FROM `article` WHERE `id` = 482296 LIMIT 1 [ RunTime:0.000491s ]
  9. UPDATE `article` SET `lasttime` = 1775422099 WHERE `id` = 482296 [ RunTime:0.005363s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000260s ]
  11. SELECT * FROM `article` WHERE `id` < 482296 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000442s ]
  12. SELECT * FROM `article` WHERE `id` > 482296 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000433s ]
  13. SELECT * FROM `article` WHERE `id` < 482296 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000930s ]
  14. SELECT * FROM `article` WHERE `id` < 482296 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000941s ]
  15. SELECT * FROM `article` WHERE `id` < 482296 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003455s ]
0.088798s