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草业学报 ›› 2025, Vol. 34 ›› Issue (7): 95-106.DOI: 10.11686/cyxb2024317

• 研究论文 • 上一篇    下一篇

青贮玉米真菌性病害对青贮发酵微生物多样性的影响

孔天赐1(), 马学青1, 贺晨帮2, 樊泰延1, 芦光新1, 祁鹤兴1()   

  1. 1.青海大学农牧学院,青海 西宁 810016
    2.青海大学农林科学院,青海 西宁 810016
  • 收稿日期:2024-08-09 修回日期:2024-10-08 出版日期:2025-07-20 发布日期:2025-05-12
  • 通讯作者: 祁鹤兴
  • 作者简介:E-mail: qhx390495559@126.com
    孔天赐(1999-),女,甘肃永靖人,在读硕士。E-mail: 15120470146@163.com
  • 基金资助:
    国家自然科学基金(32460653)

Effects of fungal diseases of silage maize on microbial diversity of silage fermentation

Tian-ci KONG1(), Xue-qing MA1, Chen-bang HE2, Tai-yan FAN1, Guang-xin LU1, He-xing QI1()   

  1. 1.College of Agriculture and Animal Husbandry,Qinghai University,Xining 810016,China
    2.Academy of Agriculture and Forestry Sciences,Qinghai University,Xining 810016,China
  • Received:2024-08-09 Revised:2024-10-08 Online:2025-07-20 Published:2025-05-12
  • Contact: He-xing QI

摘要:

为探究青贮玉米真菌性病害对青贮发酵微生物多样性的影响,以CK(未发生任何病害的青贮玉米)、YLG(发生链格孢叶斑病青贮玉米)、YM(发生麦根腐平脐蠕孢叶斑病青贮玉米)、YL(发生瘤黑粉病青贮玉米)、YX(发生锈病青贮玉米)为研究对象,每个处理3个重复。青贮发酵40 d后,采用Illumina扩增子测序技术分析各样品微生物多样性。分析发现各青贮玉米样品微生物结构由6门、50目、164属真菌和11门、43目、123属细菌组成。真菌群落中子囊菌门和担子菌门是各样品优势菌门,在各样本中的总丰度达90%以上;镰刀菌属和念珠菌属丰度在发生病害组高于未发生病害组,青霉菌属和曲霉菌属丰度在发生麦根腐平脐蠕孢叶斑病和锈病组高于未发生病害组,发生病害的青贮玉米中威克汉姆酵母属丰度均低于健康组。细菌群落中厚壁菌门和变形菌门是各样品优势菌门,在各样本中的总丰度达99%以上;未发生病害组中肠球菌属、魏斯氏菌属丰度均高于发生病害组;链球菌属仅出现在未发生病害组中,相对丰度为0.003%。本研究明确了不同病害玉米青贮样本中微生物群落结构及各优势菌属,并发现真菌性病害会导致致病菌丰度增加,使得肠球菌属、魏斯氏菌属、链球菌属丰度降低,破坏青贮发酵环境,影响发酵过程正常进行,从而可能导致青贮饲料品质下降,为后续青贮玉米品质研究提供了理论依据。

关键词: 青贮玉米, 病原真菌, 微生物多样性, Illumina测序

Abstract:

This research explored the effects of fungal diseases of silage maize on microbial diversity and community structure of maize silage during fermentation. Fermentation of maize silage without any disease (CK) was compared with that of silage maize infected by Alternaria leaf spot disease (YLG), Bipolaris sorokiniana leaf spot disease (YM), Ustilago maydis silage maize (YL) and common rust (YX), with three replicates per treatment. After 40 days of silage fermentation, Illumina amplicon sequencing technology was used to analyze the fungal and bacterial diversity of microbial communities in each sample. The analysis revealed that the microbial structure of silage maize samples was composed of 6 phyla, 50 orders and 164 genera of fungi and 11 phyla, 43 orders and 123 genera of bacteria. The fungal taxa Ascomycota and Basidiomycota were the dominant phyla in each sample, with a total abundance of more than 90% in each sample. The abundance of the fungal genera Fusarium and Candida in silage maize with disease was higher than that in the CK treatment, and the abundance of Penicillium and Aspergillus in the YM and YX was higher than that in the CK treatment, while the abundance of Wickerhamomyces in silage maize with disease was lower than in the CK treatment. Firmicutes and Proteobacteria were the dominant bacterial phyla in each sample, with a total abundance of more than 99% in each case. The abundance of Enterococcus and Weissella was higher in the CK treatment than in the treatments with disease; and Streptococcus was only present in the CK treatment, with a relative abundance of 0.003%. In summary, this study has clarified the microbial community structure during maize silage fermentation in disease-free crop substrate and in crops affected by four different fungal diseases and identified the dominant bacterial genera present during fermentation in each case. Our study showed that the presence of fungal diseases resulted in an increase in the abundance of disease-causing pathogens, which decreased the abundance of EnterococcusWeissella and Streptococcus. These changes would potentially have a negative impact on the silage fermentation environment, and affect the normal progress of the fermentation process, possibly leading to a decline in silage quality. Our results also provide information for the subsequent study of quality in maize silage.

Key words: silage corn, pathogenic fungi, microbial diversity, Illumina sequencing