畜牧与饲料科学 ›› 2025, Vol. 46 ›› Issue (4): 33-39.doi: 10.12160/j.issn.1672-5190.2025.04.005

• 草业科学 • 上一篇    下一篇

干旱胁迫后复水对达乌里胡枝子种子萌发及幼苗生长的影响

董秋丽1,2, 卫洋帆2, 石宇艳2, 赵萍2, 夏方山2, 李尹琳2   

  1. 1.山西农业大学林学院,山西 太谷 030801;
    2.山西农业大学草业学院,山西 太谷 030801
  • 收稿日期:2025-05-08 出版日期:2025-07-30 发布日期:2025-10-28
  • 通讯作者: 夏方山(1983—),男,教授,博士,主要研究方向为草类植物育种与种子科学。
  • 作者简介:董秋丽(1985—),女,实验师,硕士,主要从事草种子科学研究工作。卫洋帆(2003—),女,所学为草业科学。董秋丽、卫洋帆为共同第一作者。
  • 基金资助:
    山西省高等学校大学生创新创业训练计划项目(20240238); 山西省重点研发计划项目(202102140601006); 山西农业大学“十四五”生物育种工程项目(YZGC134)

Effects of Rehydration Following Drought Stress on Seed Germination and Seedling Growth of Lespedeza davurica

DONG Qiuli1,2, WEI Yangfan2, SHI Yuyan2, ZHAO Ping2, XIA Fangshan2, LI Yinlin2   

  1. 1. College of Forestry, Shanxi Agricultural University,Taigu 030801,China;
    2. College of Grassland Science, Shanxi Agricultural University,Taigu 030801,China
  • Received:2025-05-08 Online:2025-07-30 Published:2025-10-28

摘要: [目的]探讨干旱胁迫后复水对达乌里胡枝子(Lespedeza davurica)种子萌发及幼苗生长的影响。[方法]以达乌里胡枝子种子为材料,以水势为0(CK)、-0.1、-0.3、-0.5、-0.7 MPa的聚乙二醇(Polyethylene glycol,PEG)溶液模拟干旱胁迫3、6、9、12、14 d后复水,分析其发芽率(germination percentage,Gp)、平均发芽时间(mean germination time,MGT)、发芽指数(germination index,Gi)、幼苗活力指数(seedling vigor index,SVI)、胚根长(radicle length,RL)和胚芽长(plumule length,PL)的变化规律。[结果]随着PEG水势和胁迫时间的增加,达乌里胡枝子种子的Gp、Gi、SVI、RL和PL均呈下降趋势,MGT呈上升趋势。低水势(-0.1 MPa)PEG短时间(3 d)干旱胁迫后复水,可促进达乌里胡枝子种子萌发及幼苗生长,而高水势(-0.5、-0.7 MPa)PEG长时间(9~14 d)干旱胁迫后复水则抑制达乌里胡枝子种子萌发及幼苗生长。[结论]达乌里胡枝子种子萌发及幼苗生长能耐受PEG水势低于-0.5 MPa、不超过9 d的干旱胁迫,并需及时复水,才能有效缓解干旱胁迫造成的损伤。

关键词: 达乌里胡枝子, 干旱胁迫, 复水, 种子萌发, 幼苗生长, 聚乙二醇

Abstract: [Objective] To investigate the effects of rehydration following drought stress on seed germination and seedling growth of Lespedeza davurica[Methods] Seeds of L. davurica. were used as experimental materials and subjected to drought stress simulated by polyethylene glycol (PEG) solutions with water potentials of 0 (control, CK), -0.1, -0.3, -0.5, and -0.7 MPa for durations of 3, 6, 9, 12, and 14 days, followed by rehydration. The patterns of changes in germination percentage (Gp), mean germination time (MGT), germination index (Gi), seedling vigor index (SVI), radicle length (RL), and plumule length (PL) were analyzed. [Results] With increasing PEG water potential and prolonged stress duration, Gp, Gi, SVI, RL, and PL of L. davurica seeds exhibited a declining trend, while MGT showed an increasing trend. Rehydration following short-term (3 days) drought stress at low water potential (-0.1 MPa) promoted seed germination and seedling growth of L. davurica, whereas rehydration after long-term (9-14 days) drought stress at high water potentials (-0.5 and -0.7 MPa) inhibited seed germination and seedling growth of L. davurica. [Conclusion] Seed germination and seedling growth of L. davurica can tolerate drought stress induced by PEG at water potentials below -0.5 MPa for no more than days, provided timely rehydration is applied to effectively mitigate the damage caused by drought stress.

Key words: Lespedeza davurica, drought stress, rehydration, seed germination, seedling growth, polyethylene glycol

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