欢迎访问《草业学报》官方网站,今天是

草业学报 ›› 2026, Vol. 35 ›› Issue (9): 100-112.DOI: 10.11686/cyxb2025397

• 研究论文 • 上一篇    

2,4-表油菜素内酯对盐碱胁迫下藜麦幼苗生长的促进效应

赵颖(), 张聪聪, 宋雨婷, 张翀敏, 安悦, 杨宾宾, 马永, 王宝强()   

  1. 甘肃农业大学生命科学技术学院,甘肃 兰州 730070
  • 收稿日期:2025-09-29 修回日期:2025-11-10 出版日期:2026-09-20 发布日期:2026-07-27
  • 通讯作者: 王宝强
  • 作者简介:Corresponding author. E-mail: wangbq@gsau.edu.cn
    赵颖(1991-),女,宁夏银川人,讲师,博士。E-mail: zhaoy@gsau.edu.cn
  • 基金资助:
    甘肃农业大学大学生创新创业训练项目(2025110113);国家自然科学基金青年科学基金(32301775)

Promoting effect of 2,4-epibrassinolide on the growth of quinoa seedlings under saline-alkali stress

Ying ZHAO(), Cong-cong ZHANG, Yu-ting SONG, Chong-min ZHANG, Yue AN, Bin-bin YANG, Yong MA, Bao-qiang WANG()   

  1. College of Life Science and Technology,Gansu Agricultural University,Lanzhou 730070,China
  • Received:2025-09-29 Revised:2025-11-10 Online:2026-09-20 Published:2026-07-27
  • Contact: Bao-qiang WANG

摘要:

为探究外源2,4-表油菜素内酯(EBR)调控藜麦幼苗耐盐碱胁迫的机理,以‘陇藜1号’为试验材料,研究盐、碱和混合盐碱胁迫下外源EBR对藜麦幼苗生长、叶绿素、渗透调节、抗氧化酶、油菜素内酯(BR)合成及信号转导基因的影响。结果表明,盐碱处理下藜麦幼苗叶片萎蔫发黄,株高、鲜重、叶绿素(Chl)含量显著降低,丙二醛(MDA)含量、相对电导率(RC)、脯氨酸(Pro)含量、可溶性糖(SS)含量显著上升(P<0.05)。胁迫下喷施EBR后,叶片萎蔫卷缩有所缓解,株高和鲜重分别平均增加了13.37%和71.36%,对混合盐碱胁迫的缓解效果最好。藜麦叶片Chl、Pro、SS含量分别平均增加了12.74%、7.68%和38.67%;超氧化物歧化酶(SOD)、过氧化物酶(POD)、过氧化氢酶(CAT)活性分别平均提升了121.90%、6.43%、27.56%, MDA含量及RC分别降低了22.30%和18.62%。BR信号转导基因CqBAK1及BR合成基因CYP90B1表达量增加。综上,EBR可通过盐碱胁迫下藜麦幼苗渗透调节、抗氧化系统及BR信号转导之间的协调作用,提高藜麦的耐盐碱性。本研究为利用EBR提高藜麦幼苗耐盐碱性提供了理论依据与技术支撑。

关键词: 藜麦, 2,4-表油菜素内酯, 盐碱胁迫, 生理特性, 基因表达

Abstract:

The aim of this work was to investigate the mechanism by which exogenous 2,4-epibrassinolide (EBR) regulates salt and alkali stress tolerance in quinoa (Chenopodium quinoa) seedlings. Seedlings of the quinoa variety ‘Longli No.1’ were treated with exogenous EBR and seedling growth, chlorophyll content, osmotic regulation, antioxidant enzyme activity, and transcript levels of genes related to brassinolide (BR) synthesis and signaling under saline, alkaline and mixed saline-alkali stress conditions were determined. The results show that under saline and alkaline treatments, quinoa seedlings exhibited leaf wilting and yellowing, significant reductions in plant height, fresh weight, and chlorophyll (Chl) content, and significant increases in malondialdehyde (MDA) content, relative conductivity (RC), proline (Pro) content, and soluble sugars (SS) content (P<0.05). After foliar application of EBR under saline-alkaline stress, leaf wilting and curling symptoms were alleviated, and plant height and fresh weight were increased by 13.37% and 71.36%, respectively. The most pronounced stress-alleviating effect of EBR was observed under mixed saline and alkali stress, with the leaf Chl, Pro, and SS contents increased by an average of 12.74%, 7.68%, and 38.67%, respectively, in the EBR-treated seedlings compared with the control seedlings. Superoxide dismutase, peroxidase, and catalase activities were increased by 121.90%, 6.43%, and 27.56%, respectively, whereas MDA contents and RC were decreased by 22.30% and 18.62%, respectively, in the EBR-treated seedlings compared with the control seedlings. Treatment with EBR resulted in increased transcript levels of the BR signal transduction gene CqBAK1 and the BR synthesis gene CYP90B1. In conclusion, EBR enhances the saline-alkali tolerance of quinoa by coordinating the osmotic adjustment system, antioxidant system, and BR signaling pathway. The results of this study provide theoretical and technical support for using EBR to improve the salt tolerance of quinoa seedlings.

Key words: quinoa, 2,4-epibrassinolide, saline-alkali stress, physiological characteristics, gene expression