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中国农学通报

中国农学通报 ›› 2026, Vol. 42 ›› Issue (19): 30-37.doi: 10.11924/j.issn.1000-6850.casb2025-0902

• 农学·农业基础科学 • 上一篇    下一篇

盐胁迫下油菜素内酯对红麻幼苗生长的促进效应

苏雨娟1(), 钟海龙1, 唐慧娟1, 栾明宝1,2, 李建军1,2, 黄思齐1()   

  1. 1 中国农业科学院麻类研究所， 长沙 410205
    2 山东众力棉业科技有限公司， 山东东营 257500
  • 收稿日期:2025-11-03 修回日期:2026-07-30 出版日期:2026-10-15 发布日期:2026-10-15
  • 通讯作者:
    黄思齐，男，1982年出生，湖南醴陵人，副研究员，博士，主要从事麻类作物栽培育种研究。通信地址：410205 湖南省长沙市岳麓区咸嘉湖街道348号 中国农科院麻类研究所，E-mail：。
  • 作者简介:

    苏雨娟，女，1998年出生，湖南湘阴人，硕士研究生，研究方向为作物科学。通信地址：410205 湖南省长沙市岳麓区咸嘉湖街道348号 中国农科院麻类研究所，E-mail：。

  • 基金资助:
    中国农业科学院科技创新工程“南方特色作物遗传育种团队”(CAAS-ASTIP-IBFC-03); 山东省重点研发计划“强耐盐碱麻类作物品种选育及应用”(2024SFGC0402)

Promotive Effect of Brassinolide on Growth of Kenaf Seedlings Under Salt Stress

SU Yujuan1(), ZHONG Hailong1, TANG Huijuan1, LUAN Mingbao1,2, LI Jianjun1,2, HUANG Siqi1()   

  1. 1 Institute of Bast Fiber Crops, Chinese Academy of Agricultural Sciences, Changsha 410205
    2 Shandong Zhongli Cotton Industry Technology Co., Ltd., Dongying, Shandong 257500
  • Received:2025-11-03 Revised:2026-07-30 Published:2026-10-15 Online:2026-10-15

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摘要：

为研究外源油菜素内酯(brassinolide，BR)对盐胁迫下红麻幼苗生长的缓解效应及其生理机制，以中国农业科学院麻类研究所培育的‘中红麻21号’为材料，在水培条件下，用125 mmol/L NaCl溶液模拟盐胁迫，设置0.025、0.05、0.075、0.1 mg/L 4个BR浓度处理。研究表明，与单一盐胁迫处理相比，外源BR处理能有效缓解盐胁迫对红麻幼苗的抑制作用，其中0.05 mg/L BR的缓解效果最为显著。在生长方面，与NaCl处理相比，0.05 mg/L BR浓度处理使幼苗株高、根长、鲜重和干重分别显著提高了74.1%、57.6%、88.6%和92.2%(P<0.05)，表明BR可有效促进盐胁迫下红麻幼苗的生物量积累和形态建成。在生理响应方面，与NaCl处理相比，0.05 mg/L BR处理使叶绿素相对含量、可溶性糖含量分别提高了44.0%、58.3%，这些变化有助于维持细胞渗透平衡和光合作用效率。在抗氧化系统方面，0.05 mg/L BR处理显著增强了超氧化物歧化酶(SOD)、过氧化物酶(POD)和过氧化氢酶(CAT)的活性，分别比盐胁迫对照提高了68.4%、241.9%和100.6%，并有效清除了过量的过氧化氢(H2O2)和超氧阴离子(O2·-)，使膜脂过氧化产物丙二醛(MDA)含量与相对电导率显著下降，细胞膜结构的完整性得以维持。本研究证实，外源BR可通过协同调控渗透调节物质积累与抗氧化酶系统，有效增强红麻幼苗的耐盐性。

关键词: 红麻, 盐胁迫, 油菜素内酯, 耐盐性, 渗透调节, 抗氧化酶系统, 幼苗生长

Abstract:

This study aims to investigate the alleviating effects of exogenous brassinolide (BR) on the salt stress in growth of kenaf seedlings and to elucidate the underlying physiological mechanisms. The cultivar ‘Zhonghongma 21’, developed by the Institute of Bast Fiber Crops, Chinese Academy of Agricultural Sciences, was used as the experimental material. Salt stress was simulated under hydroponic conditions using 125 mmol/L NaCl solution, and four BR concentrations (0.025, 0.05, 0.075, and 0.1 mg/L) were applied. The results showed that exogenous BR effectively alleviated the inhibitory effects of salt stress on kenaf seedlings compared with the NaCl treatment alone, and the 0.05 mg/L BR treatment exhibited the most significant alleviating effect. Compared with the NaCl treatment, the 0.05 mg/L BR treatment significantly increased plant height, root length, fresh weight, and dry weight by 74.1%, 57.6%, 88.6%, and 92.2%, respectively (P<0.05), indicating that BR promoted biomass accumulation and morphological development in kenaf seedlings under salt stress. In addition, the relative chlorophyll content and soluble sugar content increased by 44.0% and 58.3%, respectively, which contributed to maintaining cellular osmotic balance and photosynthetic efficiency. The activities of superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT) increased by 68.4%, 241.9%, and 100.6%, respectively, compared with the NaCl treatment. Meanwhile, the accumulation of hydrogen peroxide (H2O2) and superoxide anion (O2·-) was reduced, accompanied by significant decreases in malondialdehyde (MDA) content and relative electrical conductivity. These findings indicate that exogenous BR can enhance the salt tolerance of kenaf seedlings by coordinately regulating accumulation of osmotic adjustment substance and the antioxidant enzyme system.

Key words: kenaf, salt stress, brassinolide, salt tolerance, osmotic adjustment, antioxidant enzyme system, seedling growth

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