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草业学报 ›› 2026, Vol. 35 ›› Issue (6): 145-154.DOI: 10.11686/cyxb2025255

• 研究论文 • 上一篇    

锰耐受性种子内生菌筛选及其促进锰胁迫下种子萌发与幼苗生长的研究

余子欣(), 沈为正(), 潘高, 王雯颖, 刘文胜()   

  1. 中南林业科技大学生命科学与技术学院,湖南 长沙 410004
  • 收稿日期:2025-06-26 修回日期:2025-09-01 出版日期:2026-06-20 发布日期:2026-04-13
  • 通讯作者: 刘文胜
  • 作者简介:Corresponding author. E-mail: liuwsairr@163.com
    余子欣(2004-),女,浙江衢州人,在读本科。E-mail: 2941788420@qq.com
    沈为正(2000-),男,湖南临湘人,在读硕士。E-mail: 2354350858@qq.com第一联系人:共同第一作者
  • 基金资助:
    国家自然科学基金(42177018);湖南省大学生创新项目(S202410538069)

Screening of manganese-tolerant endophytic fungi from seeds and their ability to promote seed germination and seedling growth under manganese stress

Zi-xin YU(), Wei-zheng SHEN(), Gao PAN, Wen-yin WANG, Wen-sheng LIU()   

  1. School of Life Sciences and Technology,Central South University of Forestry and Technology,Changsha 410004,China
  • Received:2025-06-26 Revised:2025-09-01 Online:2026-06-20 Published:2026-04-13
  • Contact: Wen-sheng LIU

摘要:

本研究以前期从湘潭锰矿植物种子获得的4种优势可培养种子内生真菌及大叶胡枝子、五节芒、青葙和藜这4种不同生活型的植物种子为材料,开展真菌锰耐受性试验以及接种内生菌对锰胁迫下种子发芽与幼苗生长影响的试验。研究结果显示,4种内生真菌相比较,链格孢霉在高锰胁迫下的菌落直径、生物量变化最小。该菌的最小抑菌浓度为50 mmol·L-1,Mn2+吸附率达75.6%,高于其他3株真菌,这说明链格孢霉锰耐受性最强。接种链格孢霉提高了锰胁迫下大叶胡枝子、五节芒、青葙和藜的种子发芽率与发芽势,促进了幼苗生长。高Mn2+浓度(20 mmol·L-1)时,大叶胡枝子、五节芒、青葙、藜的接菌组发芽率分别较非接菌组提高4.9%、12.9%、88.9%、93.3%,总生物量则分别较非接菌组提高4.0%、117.1%、31.5%、35.7%。这说明链格孢霉对胁迫下种子发芽与幼苗生长的促进作用具有广谱性。

关键词: 锰胁迫, 种子内生菌, 种子萌发, 幼苗生长, 耐受性

Abstract:

In this study, we first evaluated the tolerance of endophytic fungi isolated from seeds of several plant species to manganese (Mn) stress, and then determined whether they were able to promote the growth of the same plants under Mn stress. Four culturable dominant endophytic fungi (Corynespora cassiicolaCurvularia lunata, Pestalotiopsis microspora, and Alternaria sp.) that had previously been isolated and screened from seeds of plants growing at a Mn mine in Xiangtan were used in this study. These fungi had been isolated from seeds of plants belonging to different life forms (Lespedeza davidii, a shrub; Miscanthus floridulusa giant grass; Celosia argentea, a tropical herbaceous plant;and Chenopodium album, an annual flowering plant). The Mn tolerance of the seed endophytic fungi was evaluated, and then their ability to promote seed germination and growth of the four plant species under Mn stress was evaluated. When the fungi were grown under control conditions and under Mn stress, the colony diameter and the biomass of Alternaria sp. changed the least among the four endophytic fungi (C. cassiicolaC. lunata, P. microspora, and Alternaria sp.). For Alternaria sp., the minimum inhibitory concentration of Mn was 50 mmol·L-1 and the Mn2+ adsorption rate was 75.6%; these values were higher than those determined for the other three endophytic fungi. These findings indicated that Alternaria sp. had the strongest Mn tolerance. In addition, under Mn stress, inoculation with Alternaria sp. increased the seed germination rates and germination potential of L. davidiiM. floridulusC. argentea, and C. album, and promoted their seedling growth. The seed germination rates of the inoculated group of L. davidiiM. floridulusC. argentea, and C. album were 4.9%, 12.9%, 88.9%, and 93.3% higher, respectively, than those of the non-inoculated group, and the total biomasses of the inoculated group were 4.0%, 117.1%, 31.5%, 35.7% higher, respectively, than those of the non-inoculated group. The results show that Alternaria sp. can promote seed germination and seedling growth of many plant species under stress. Consequently, this fungal strain is a promising candidate strain for environmental remediation.

Key words: Mn stress, seed endophytic fungi, seed germination, seedling growth, tolerance