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草业学报 ›› 2025, Vol. 34 ›› Issue (7): 158-170.DOI: 10.11686/cyxb2024330

• 研究论文 • 上一篇    

干旱及复水对河北木蓝生物量分配与渗透调节特征的影响

雍嘉仪1(), 马霜1, 马风华1, 赵小娜1, 张译尹1, 胡海英1,2()   

  1. 1.宁夏大学林业与草业学院,宁夏 银川 750021
    2.宁夏大学草牧业工程技术研究中心,宁夏 银川 750021
  • 收稿日期:2024-08-27 修回日期:2024-10-21 出版日期:2025-07-20 发布日期:2025-05-12
  • 通讯作者: 胡海英
  • 作者简介:E-mail: haiying@nxu.edu.cn
    雍嘉仪(2001-),女,宁夏中卫人,在读硕士。E-mail: 1683141753@qq.com
  • 基金资助:
    自治区重点研发计划重点项目(2022CMG02011);国家自然科学基金(32160406);宁夏高等学校一流学科建设(草学学科)项目(NXYLXK2017A01)

Effects of drought stress and rehydration on biomass allocation and osmotic regulation characteristics of Indigofera bungeana

Jia-yi YONG1(), Shuang MA1, Feng-hua MA1, Xiao-na ZHAO1, Yi-yin ZHANG1, Hai-ying HU1,2()   

  1. 1.College of Forestry and Prataculture,Ningxia University,Yinchuan 750021,China
    2.Grass and Animal Husbandry Engineering Technology Research Center,Ningxia University,Yinchuan 750021,China
  • Received:2024-08-27 Revised:2024-10-21 Online:2025-07-20 Published:2025-05-12
  • Contact: Hai-ying HU

摘要:

植物在遭受干旱胁迫后复水,会经历应激适应、伤害、修复过程,且不同植物对水分亏缺的敏感性不同,复水后的恢复效应也存在差异。因此,研究植物耐旱性与复水后的恢复效应对植物抗旱节水育种具有重要意义。本研究采用盆栽控水模拟干旱胁迫和复水处理,以野生型和栽培型河北木蓝为对象,在持续干旱胁迫3、6、10和13 d以及复水2和7 d后进行生长及生理生化指标测定,研究干旱胁迫和复水条件下2种木蓝的生物量分配策略和响应干旱的渗透调节生理机制及其种内差异。结果表明:1)随干旱持续时间的延长,2种木蓝器官生物量、根系分布特征(总根长、根表面积、根体积、根分枝数)、淀粉含量以及根-中性转化酶(neutral invertase, NIV)活性逐渐降低;而根冠比、脯氨酸(Pro)含量、丙二醛(MDA)含量、蔗糖含量、蔗糖合酶(sucrose synthase, SUS)活性、α-淀粉酶(α-amylase, α-AL)活性、叶-NIV活性均逐渐增加。2)复水处理7 d后,除了根系分布特征和MDA含量外,其他指标均恢复至对照水平,均具有补偿生长能力。3)基于各指标的主成分分析结果,相比之下,栽培型木蓝各指标变化幅度均显著大于野生型,对干旱胁迫具有更强的耐受性。由此可见,2种木蓝在干旱胁迫下积累渗透调节物质,以此维持细胞膨压,缓解细胞膜受损,并调控蔗糖和淀粉代谢酶活性,进而使生物量分配倾向于根系,为促进根系对水分吸收而提供能量,复水后二者均具有显著的补偿效应。

关键词: 河北木蓝, 干旱及复水, 生物量分配, 渗透调节, 补偿生长

Abstract:

Plants under drought stress show various types of injury, and have adaptation strategies and repair processes that function during rehydration after drought stress. The degree of sensitivity to water deficit and the extent of recovery after rehydration differ among different plants. Therefore, it is of great significance to study drought tolerance and recovery after rehydration to breed drought-resistant and water-saving plants. In this research, a comparative analysis was conducted using wild and cultivated species of Indigofera bungeana. The plants were subjected to a drought stress treatment, imposed by controlling the water level in pots, followed by rehydration. Growth and physiological indexes were measured at 3, 6, 10, and 13 days of the drought stress treatment and at 2 and 7 days after rehydration. We explored the effects of drought stress and rehydration on biomass distribution to different organs, root distribution, and osmotic regulation, with an aim to analyze biomass allocation strategies and the physiological mechanisms of the drought response, and compared these characteristics between wild and cultivated I. bungeana. The main results of the study are as follows: 1) With prolonged drought stress, the organ biomass, root allocation characteristics (total root length, root surface area, root volume, root branches), starch content, and activity of root neutral invertase (NIV) decreased, whereas the root-shoot ratio, the contents of proline, malondialdehyde (MDA), and sucrose, and the activities of sucrose synthase, α-amylase, and leaf NIV gradually increased. 2) At 7 days after rehydration, except for root distribution and MDA content, all the other growth and physiological indexes returned to the control level, indicating that the plants were capable of compensatory growth after drought. 3) A principal component analysis based on all the indexes showed that the amplitude of the change in the indexes was significantly greater in the cultivated species than in the wild one, indicating that the cultivated species is more tolerant to drought stress. Under continuous drought stress, the two species of I. bungeana maintained turgor pressure by accumulating osmolarity-regulating substances, which alleviated damage to cell membranes. Moreover, the activity of sucrose- and starch-metabolizing enzymes was regulated to allocate biomass to the root system, and to provide energy to promote water absorption by the root system as adaptations to drought stress. Both species showed significant compensatory growth after rehydration.

Key words: Indigofera bungeana, drought and rehydration, biomass allocation, osmotic regulation, compensatory growth