浙江农业学报 ›› 2025, Vol. 37 ›› Issue (10): 2104-2115.DOI: 10.3969/j.issn.1004-1524.20250023

• 园艺科学 • 上一篇    下一篇

杨属植物HKT基因家族成员鉴定与盐胁迫下的表达模式分析

廖小龙1(), 王兴胜1, 陈勇1, 李斌1, 洪思丹2, 梅利那2, 国颖2,*()   

  1. 1.伊犁哈萨克自治州林木良种繁育试验中心(伊犁哈萨克自治州平原林场),新疆 伊犁 835311
    2.南京林业大学 林草学院,水土保持学院,江苏省杨树种质创新与品种改良重点实验室,南方现代林业协同创新中心,江苏 南京 210037
  • 收稿日期:2025-01-09 出版日期:2025-10-25 发布日期:2025-11-13
  • 作者简介:廖小龙(1972—),男,四川遂宁人,硕士研究生,高级工程师,研究方向为林木良种选育。E-mail:632771570@qq.com
  • 通讯作者: 国颖,E-mail:yingguo@njfu.edu.cn
  • 基金资助:
    科技创新2030-重大项目课题(2023ZD0405601)

Identification of the HKT gene family members in Populus species and analysis of their expression patterns under salt stress

LIAO Xiaolong1(), WANG Xingsheng1, CHEN Yong1, LI Bin1, HONG Sidan2, MEI Lina2, GUO Ying2,*()   

  1. 1. Ili Experimental Center of Tree Breeding for Improved Varieties(Plain Forestry Farm), Ili Kazak Autonomous Prefecture, Ili 835311, Xinjiang, China
    2. Jiangsu Key Laboratory for Poplar Germplasm Enhancement and Variety Improvement, Co-Innovation Center for the Sustainable Forestry in Southern China, College of Forestry and Grassland, College of Soil and Water Conservation, Nanjing Forestry University, Nanjing 210037, China
  • Received:2025-01-09 Online:2025-10-25 Published:2025-11-13

摘要: 为探究高亲和性K+转运蛋白(high-affinity K+ transporter, HKT)在杨属植物盐胁迫响应中的功能,并筛选耐盐育种关键基因,对包括银腺杨84K在内的11个杨属(Populus)物种开展全基因组水平的HKT基因家族成员鉴定,系统分析这些成员的保守结构域、蛋白质理化性质、保守基序(motif)、染色体定位和顺式作用元件等,并结合盐胁迫下银腺杨84K的实时荧光定量PCR(qRT-PCR)和转录组测序(RNA-seq)数据解析HKT基因的时空表达谱。结果显示,共鉴定出30个HKT家族基因,其中29个基因定位于各物种的18号染色体。系统进化分析表明,这30个HKT基因均属于HKT1类,并划分为HKT1;4和HKT1;5两个亚组。顺式作用元件分析表明,启动子区域含有TC-rich repeats、MBS、G-box等重要的胁迫响应元件。PaghAHKT1;4在银腺杨84K中呈现出随着盐胁迫时间延长表达显著上调的趋势。综上,在杨属中共鉴定出30个HKT基因,这些基因在对盐胁迫的响应中发挥重要作用,其中PaghAHKT1;4可能是银腺杨84K耐盐育种的潜在靶基因。

关键词: 杨属, 高亲和性K+转运蛋白家族, 盐胁迫, 表达模式

Abstract:

To investigate the function of high-affinity K transporters (HKT) in the salt stress response of Populus species and to identify key genes for salt-tolerant breeding, a genome-wide identification of HKT gene family members was conducted in 11 Populus species, including Populus alba × P. glandulosa clone 84K (poplar clone 84K). Bioinformatics analyses were performed to characterize conserved domains, physicochemical properties, conserved motifs, chromosomal localization, and cis-acting elements. Additionally, the spatiotemporal expression profiles of HKT genes were analyzed using qRT-PCR and RNA-seq data from salt-treated poplar clone 84K. A total of 30 HKT family genes were identified, 29 of which were located on chromosome 18 across the species. Phylogenetic analysis revealed that all 30 HKT genes belong to the HKT1 subfamily and were further divided into two subgroups: HKT1;4 and HKT1;5. Cis-acting element analysis indicated that the promoter regions contained important stress-responsive elements, such as TC-rich repeats, MBS, and G-box. Notably, PaghAHKT1;4 exhibited a significant upregulation in expression with prolonged salt stress in poplar clone 84K. In conclusion, 30 HKT genes were identified in Populus, which play important roles in salt stress response. Among them, PaghAHKT1;4 might serve as a potential target gene for salt-tolerant breeding in poplar clone 84K.

Key words: Populus species, high-affinity K+ transporter(HKT) family, salt stress, expression pattern

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