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草业学报 ›› 2024, Vol. 33 ›› Issue (7): 68-83.DOI: 10.11686/cyxb2023335

• 研究论文 • 上一篇    下一篇

盐生草AKR基因家族成员的鉴定及根系盐胁迫响应基因HgAKR42639的耐盐分析

张震欢1,2(), 姚立蓉1,3, 汪军成1,3, 司二静1,3, 张宏1,3, 杨轲1,3, 马小乐1,3, 孟亚雄1,3, 王化俊1,3, 李葆春1,2()   

  1. 1.甘肃农业大学省部共建干旱生境作物学国家重点实验室,甘肃省作物遗传改良与种质创新重点实验室,甘肃 兰州 730070
    2.甘肃农业大学生命科学技术学院,甘肃 兰州 730070
    3.甘肃农业大学农学院,甘肃 兰州 730070
  • 收稿日期:2023-09-14 修回日期:2023-11-03 出版日期:2024-07-20 发布日期:2024-04-08
  • 通讯作者: 李葆春
  • 作者简介:E-mail: libc@gsau.edu.cn
    张震欢(2000-),女,侗族,贵州黔东南人,在读硕士。E-mail: 2495252135@qq.com
  • 基金资助:
    国家自然科学基金项目(31960072);财政部和农业农村部:国家现代农业产业技术体系项目(CARS-05-04B-2);甘肃省教育厅:产业支撑计划项目(2021CYZC-12);甘肃省青年基金项目(22JR5A880);甘肃省自然基金项目(20JR10RA507);甘肃农业大学伏羲青年英才计划(Ganfx-04Y11);甘肃农业大学国家级大学生创新创业训练计划重点支持领域项目(202110733001)

Identification of AKR gene family members in Halogeton glomeratus and salt tolerance analysis of the root salt stress response gene HgAKR42639

Zhen-huan ZHANG1,2(), Li-rong YAO1,3, Jun-cheng WANG1,3, Er-jing SI1,3, Hong ZHANG1,3, Ke YANG1,3, Xiao-le MA1,3, Ya-xiong MENG1,3, Hua-jun WANG1,3, Bao-chun LI1,2()   

  1. 1.State Key Laboratory of Aridland Crop Science by Gansu Agricultural University,Gansu Key Laboratory of Crop Improvement and Germplasm Enhancement,Lanzhou 730070,China
    2.College of Life Sciences and Technology,Gansu Agricultural University,Lanzhou 730070,China
    3.College of Agronomy,Gansu Agricultural University,Lanzhou 730070,China
  • Received:2023-09-14 Revised:2023-11-03 Online:2024-07-20 Published:2024-04-08
  • Contact: Bao-chun LI

摘要:

为探究盐生草AKR基因家族的生物学功能和根系盐胁迫响应基因HgAKR42639的耐盐性,基于盐生草全长转录组测序鉴定醛酮还原酶基因(AKRs),采用生物信息学方法分析盐生草AKRs编码的蛋白质序列特性,并在200 mmol·L-1 NaCl胁迫0、6、12、24和48 h处理下,测定盐生草幼苗根系和转HgAKR42639基因拟南芥的目的基因表达量、生理指标和钠钾离子含量。结果表明:从盐生草转录组中鉴定出23个HgAKRs,编码的氨基酸数量在165~664 aa,亚细胞定位预测主要在细胞质中,AKR蛋白保守结构域高度相似,具有3个motif,启动子顺式作用元件分析存在核心元件、增强元件和胁迫响应元件;qRT-PCR结果显示HgAKR42639基因相对表达量在盐生草根系和拟南芥中均先上升后下降,24 h两者的表达量达到峰值;随着盐胁迫时间的增长两者的过氧化氢酶(CAT)、过氧化物酶(POD)、超氧化物歧化酶(SOD)活性和脯氨酸含量呈上升趋势,丙二醛(MDA)和可溶性蛋白含量呈下降趋势,在24 h达到最低;Na+和K+含量测定结果显示,两者于24 h盐胁迫处理下Na+含量下降,K+/Na+达到最大值。综上所述,本研究获得了盐生草AKR家族基因,为后续研究盐生草AKR基因响应盐胁迫的分子机制提供理论依据;以期为进一步验证HgAKR42639基因的耐盐性奠定基础。

关键词: 盐生草, AKR基因家族, 生物信息学分析, 盐胁迫

Abstract:

In order to explore the biological function of the AKR gene family and the salt tolerance of the root salt stress response gene HgAKR42639 in Halogeton glomeratus, the aldo-keto reductase gene (AKRs) was identified based on full-length transcriptome sequencing of H. glomeratus, and the protein sequence encoded by AKRs in H. glomeratus was analyzed by bioinformatics methods. The target gene expression, physiological indexes and sodium and potassium content in roots of H. glomeratus and the Arabidopsis thaliana HgAKR42639 gene were measured under 200 mmol·L-1 NaCl stress for 0, 6, 12, 24 and 48 hours. We found that 23 HgAKRs were identified from the H. glomeratus transcriptome, encoding amino acid sequences ranging from 165 to 664 aa, and the prediction of subcellular localization was mainly in the cytoplasm. AKR protein conserved domains were highly similar with 3 motifs, and there were core elements, enhancing elements and stress response elements in the analysis of promoter cis-acting elements. The results of qRT-PCR showed that the relative expression of HgAKR42639 increased initially and then decreased in both H. glomeratus roots and A. thaliana, and the expression of HgAKR42639 peaked at 24 hours. With increase in exposure time to salt stress, the activities of catalase (CAT), peroxidase (POD), superoxide dismutase (SOD) and the proline content showed an increasing trend, while the contents of malondialdehyde (MDA) and soluble protein showed a downward trend, reaching their lowest levels at 24 hours. The content of Na+ and K+ decreased under the salt stress treatment for 24 hours, and K+/Na+ reached the maximum value. In summary, the AKR family genes of H. glomeratus were obtained in this study, and the results provide a theoretical basis for further research on the molecular mechanism of regulation of response to salt stress in AKR genes in H. glomeratus. This research provides a foundation for further verification of the HgAKR42639 gene role in salt tolerance.

Key words: Halogeton glomeratus, AKR gene family, bioinformatics analysis, salt stress