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草业学报 ›› 2025, Vol. 34 ›› Issue (5): 118-129.DOI: 10.11686/cyxb2024255

• 研究论文 • 上一篇    

青稞根腐病根际土壤细菌多样性及群落结构变化规律

李雪萍1(), 许世洋2, 李建军1, 漆永红1()   

  1. 1.甘肃省农业科学院植物保护研究所,甘肃 兰州 730070
    2.兰州大学草地农业科技学院,甘肃 兰州 730020
  • 收稿日期:2024-07-02 修回日期:2024-09-05 出版日期:2025-05-20 发布日期:2025-03-20
  • 通讯作者: 漆永红
  • 作者简介:E-mail: qiyonghong920@gsagr.cn
    李雪萍(1989-),女,甘肃镇原人,副研究员,博士。E-mail: lixueping@gsagr.cn
  • 基金资助:
    国家自然科学基金项目(32060037);甘肃省农业科学院重点研发计划(2023GAAS22)

Bacterial diversity and community structural changes in rhizosphere soil of naked barley disturbed by root rot

Xue-ping LI1(), Shi-yang XU2, Jian-jun LI1, Yong-hong QI1()   

  1. 1.Institute of Plant Protection,Gansu Academy of Agricultural Sciences,Lanzhou 730070,China
    2.College of Pastoral Agriculture Science and Technology,Lanzhou University,Lanzhou 730020,China
  • Received:2024-07-02 Revised:2024-09-05 Online:2025-05-20 Published:2025-03-20
  • Contact: Yong-hong QI

摘要:

青稞根腐病危害严重,其发生、蔓延与其根际土壤细菌群落动态密切相关。为明确青稞根腐病的发生对其根际土壤细菌多样性及群落结构的影响,本研究通过对甘肃甘南藏族自治州青稞种植区的根腐病进行系统调查,采集不同发病率青稞根际土壤样品,采用高通量测序获得其根际土壤细菌群落遗传信息,分析其多样性及演替规律,并通过COG基因库注释其基因功能。结果发现,青稞根际土壤细菌物种组成丰富,均匀程度高,能全面反映样品细菌群落结构。健康样品与发病率为5%青稞根际土壤细菌群落距离最近,发病率越高,则与健康样品的距离越大。随青稞根腐病发病率升高,不同发病样本特有物种数呈先增高后降低趋势;变形菌门相对丰度先升高后降低,与绿弯菌门、酸杆菌门、拟杆菌门、放线菌门和芽单胞菌门变化相反;芽孢杆菌目、硝化螺旋菌目,芽单胞菌科、芽孢杆菌科、硝化螺旋菌科及对应的芽单胞菌属、芽孢杆菌属、硝化螺旋菌属相对丰度先升高后降低,简单芽孢杆菌相对丰度先升高后降低,而醋酸钙不动杆菌、嗜根寡养单胞菌等相对丰度先降低后升高。青稞根际土壤细菌氨基酸转运代谢、转录、脂肪转运代谢及翻译后修饰、蛋白质折叠和伴侣蛋白等功能基因的丰度因根腐病的发生而降低,信号转导机制、能量生成和转换等功能基因的丰度则升高。

关键词: 青稞, 根腐病, 群落结构, 物种多样性, 高通量

Abstract:

The occurrence and spread of naked barley (Hordeum vulgare var. nudum) root rot are known to be closely related to the dynamics of the rhizosphere soil bacterial community. This study systematically investigated naked barley root rot in fields of the Tibetan Gannan Autonomous Prefecture, Gansu Province, to clarify the influences on the diversity and structure of the rhizosphere soil bacterial community disturbed by naked barley root rot. Rhizosphere soil samples with different root rot incidences were collected, and genetic characterization of the bacterial community was obtained by high-throughput sequencing. The structural dynamics and the diversity of the bacterial community were thus analyzed. Additionally, the various bacterial functional genes were annotated using COG databases. The results revealed a rich and evenly distributed bacterial species composition in the rhizosphere soil of naked barley, which comprehensively mirrors the bacterial community structure of the samples. The bacterial community of healthy samples was closest to samples with 5% incidence of root rot. Additionally, as the incidence rate of root rot increased, the bacterial communities diverged more significantly from those of healthy samples. The number of bacterial species in diseased rhizosphere soil samples increased initially and then decreased, as the root rot incidence increased. Also, the relative abundance of Proteobacteria initially increased and then decreased with increased root rot, incidence, while a contrasting trend was observed for Chloroflexi, Acidobacteria, Bacteroidetes, Actinobacteria and Gemmatimonadetes. Similarly, the relative abundance of Bacillales, Nitrospirales, and their commonly-present families Gemmatimonadaceae, Bacillaceae, Nitrospiraceae, as well as the genera GemmatimonasBacillus, and Nitrospira, including Bacillus simplex, showed an initial increase followed by a decrease. Conversely, the relative abundance of Acinetobacter calcoaceticus and Stenotrophomonas rhizophila initially decreased and then increased. The abundance of functional genes related to bacterial amino acid transport and metabolism, transcription, lipid transport and metabolism, posttranslational modification, protein turnover, chaperones in the rhizosphere soil of naked barley decreased due to the occurrence of root rot, while the abundance of genes involved in signal transduction mechanisms and energy production and conversion increased.

Key words: naked barley, root rot, community structure, species diversity, high-throughput