植物研究 ›› 2026, Vol. 46 ›› Issue (4): 666-676.doi: 10.7525/j.issn.1673-5102.2026.04.008

• 研究论文 • 上一篇    下一篇

PagTIP1;3基因调控84K杨盐胁迫响应的光合生理特性研究

胡咏琪1,2, 张瑞1,2, 张艺森1,2, 宋跃朋1,2()   

  1. 1.北京林业大学生物科学与技术学院,北京 100083
    2.林木资源高效生产全国重点实验室,北京 100083
  • 收稿日期:2026-05-01 出版日期:2026-07-20 发布日期:2026-07-22
  • 通讯作者: 宋跃朋 E-mail:Yuepengsong@bjfu.edu.cn
  • 作者简介:胡咏琪(2002—),女,硕士研究生,主要从事杨树基因组及分子育种研究。
  • 基金资助:
    国家自然科学基金面上项目(32470381)

PagTIP1;3 Regulates Photosynthetic Physiological Characteristics of 84K Poplar in Response to Salt Stress

Yongqi HU1,2, Rui ZHANG1,2, Yisen ZHANG1,2, Yuepeng SONG1,2()   

  1. 1.College of Biological Sciences and Biotechnology,Beijing Forestry University,Beijing 100083
    2.State Key Laboratory of Efficient Production of Forest Resources,Beijing Forestry University,Beijing 100083
  • Received:2026-05-01 Online:2026-07-20 Published:2026-07-22
  • Contact: Yuepeng SONG E-mail:Yuepengsong@bjfu.edu.cn

摘要:

液泡膜内在蛋白(tonoplast intrinsic proteins,TIPs)是水通道蛋白家族的重要成员,在植物水分平衡及逆境胁迫响应中发挥关键作用。本研究以PagTIP1;3基因为对象,利用野生型84K杨(Populus alba×P. glandulosa)及其PagTIP1;3敲除株系,解析PagTIP1;3基因在杨树盐胁迫响应中的功能及分子机制。结果表明:正常条件下,PagTIP1;3基因敲除导致植株叶片叶绿素含量降低,净光合速率及株高下降。盐胁迫下,敲除株系萎蔫与黄化症状加剧,株高显著降低;最大光化学效率、电子传递速率及叶绿素相对含量等光合生理指标均显著低于野生型。转录组分析显示,光合作用通路关键基因(PagLHCB7、PagGAPCP-2、PagPSY、PagRCA)在PagTIP1;3敲除株系响应盐胁迫时的表达模式与野生型存在显著差异。综上所述,PagTIP1;3基因缺失可能通过影响盐胁迫下杨树光合作用相关基因的转录响应,损伤光合电子传递与光保护能力,破坏生长及光合生理稳态,从而显著降低杨树的耐盐性。

关键词: 水通道蛋白, 转录组, 盐胁迫, 光合特性, 基因敲除

Abstract:

Tonoplast intrinsic proteins(TIPs), as important members of the aquaporin family, play crucial roles in plant water balance and stress responses. In this study, the function and molecular mechanism of the PagTIP1;3 gene in response to salt stress were investigated in the leaves of wild-type 84K poplar(Populus alba×P.glandulosa) and PagTIP1;3 knockout lines. The results showed that under normal conditions, knockout of the PagTIP1;3 gene led to decreases in chlorophyll content, net photosynthetic rate, and plant height. Under salt stress, the knockout lines exhibited aggravated wilting and yellowing, significantly reduced plant height, and marked decreases in photosynthetic physiological parameters, including maximum photochemical efficiency, electron transport rate, and relative chlorophyll content, compared with the wild type. Transcriptome analysis revealed that the expression patterns of key genes involved in the photosynthetic pathway(including PagLHCB7PagGAPCP-2PagPSY, and PagRCA) were significantly altered in the PagTIP1;3 knockout lines in response to salt stress. In summary, it is speculated that PagTIP1;3 deficiency disrupted the transcriptional response of photosynthesis-related genes in poplar under salt stress, thereby impairing photosynthetic electron transport and photoprotection capacity, disturbing growth and photosynthetic physiological homeostasis, and ultimately significantly reducing salt tolerance in poplar.

Key words: aquaporin, transcriptome, salt stress, photosynthetic characteristics, gene knockout

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