当前位置:首页>农业>JIPB | 华中农业大学邓秀新教授团队揭示转录因子CsbHLH60介导高温抑制柑橘果皮褪绿的分子机制

JIPB | 华中农业大学邓秀新教授团队揭示转录因子CsbHLH60介导高温抑制柑橘果皮褪绿的分子机制

  • 2026-06-03 23:26:49
JIPB | 华中农业大学邓秀新教授团队揭示转录因子CsbHLH60介导高温抑制柑橘果皮褪绿的分子机制

柑橘果皮色泽是决定其商品价值的关键外观品质。然而全球变暖导致的高温胁迫常引发成熟期柑橘果皮褪绿不均, 严重影响了柑橘的市场竞争力。在此背景下解析高温如何抑制叶绿素降解的分子机制成为改良柑橘色泽品质的重要科学命题。

近日JIPB在线发表了华中农业大学果蔬园艺作物种质创新与利用全国重点实验室邓秀新教授团队题为“The transcription factor CsbHLH60 relieves high-temperature Inhibition of chlorophyll degradation in citrus”的研究论文 (https://doi.org/10.1111/jipb.70297)。该研究发现转录因子CsbHLH60是高温胁迫下调控柑橘果皮叶绿素降解的关键正调控因子并揭示了一套“双重锁定”的精细调控策略。

研究团队首先通过比较生理学分析发现30℃高温显著抑制了柑橘果皮中叶绿素分解代谢基因的表达导致叶绿素降解受阻、果皮无法正常褪绿。利用加权基因共表达网络分析 (WGCNA)团队从滞绿突变体的转录组数据中鉴定到转录因子CsbHLH60其表达在高温下被显著抑制且蛋白丰度也明显降低。

功能验证表明CsbHLH60是一个核定位的转录激活因子能够直接结合CsSGRCsRCCR启动子中的E-box元件 (CANNTG)激活这两个叶绿素降解关键基因的表达。在柑橘果皮中瞬时过表达CsbHLH60显著加速了叶绿素降解RNAi介导的基因沉默则导致褪绿过程受阻。尤为重要的是30高温条件下过表达CsbHLH60能够打破高温的抑制作用恢复果皮正常褪绿; 相比之下在20适温条件下沉默CsbHLH60即使没有高温胁迫果皮也无法正常褪绿。这些结果充分证明CsbHLH60是调控柑橘叶绿素降解的正向关键因子。

进一步的机制解析揭示了一个精巧的“双重锁定”调控模式: 高温不仅在转录水平抑制CsbHLH60启动子活性降低其mRNA水平还在翻译后水平加速CsbHLH60蛋白的降解。通过这一双重策略高温确保了功能性CsbHLH60蛋白的快速耗竭从而有效抑制了下游CsSGRCsRCCR等靶基因的表达最终延迟叶绿素分解代谢 (图1)。

CsbHLH60的过表达可打破高温对柑橘果皮叶绿素降解的抑制

综上该研究阐明了一个bHLH转录因子通过双重调控机制介导高温抑制柑橘褪绿的分子模型 (图2)不仅丰富了bHLH转录因子家族的功能多样性也为全球变暖背景下柑橘外观品质的分子改良提供了精确靶点和理论支撑

CsbHLH60调控高温下的柑橘果皮叶绿素降解模型

华中农业大学园艺林学学院邓秀新教授为论文的通讯作者已毕业博士研究生张哲惠为该论文第一作者。博士研究生胡勇君王明硕士研究生雷紫怡等参与了主要实验工作。柑橘团队柴利军教授朱凯杰副教授郑雄杰副教授叶俊丽副研究员以及秭归县果茶发展中心的廖胜才高级农艺师和李丽萍农艺师等多名成员参与了此项研究。该研究得到了湖北省中央引导地方科技发展专项 (2024EIA029)、国家现代农业 (柑橘) 产业技术体系 (CARS-26) 和2025年湖北省柑橘产业链项目的资助。

文章引用:
Zhang, Z., Hu, Y., Wang, M., Lei, Z., Liao, S., Li, L., Zheng, X., Zhu, K., Chai, L., Ye, J., et al. (2026). The transcription factor CsbHLH60 relieves high-temperature inhibition of chlorophyll degradation in citrus. J. Integr. Plant Biol.https://doi.org/10.1111/jipb.70297
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  1. CONNECT:[ UseTime:0.000586s ] mysql:host=127.0.0.1;port=3306;dbname=h_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000781s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.004617s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.002648s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000578s ]
  6. SELECT * FROM `set` [ RunTime:0.004679s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000650s ]
  8. SELECT * FROM `article` WHERE `id` = 540137 LIMIT 1 [ RunTime:0.004938s ]
  9. UPDATE `article` SET `lasttime` = 1780560770 WHERE `id` = 540137 [ RunTime:0.018887s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000889s ]
  11. SELECT * FROM `article` WHERE `id` < 540137 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.009953s ]
  12. SELECT * FROM `article` WHERE `id` > 540137 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.037992s ]
  13. SELECT * FROM `article` WHERE `id` < 540137 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.086147s ]
  14. SELECT * FROM `article` WHERE `id` < 540137 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.040570s ]
  15. SELECT * FROM `article` WHERE `id` < 540137 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.068664s ]
0.360449s