中国农业科学 ›› 2026, Vol. 59 ›› Issue (21): 4802-4814.doi: 10.3864/j.issn.0578-1752.2026.21.007

• 植物保护 • 上一篇    下一篇

我国玉米籽粒的菌群构成及优势镰孢菌产毒能力分析

成明鑫1(), 陈稳产1(), 魏凯巍1, 张赛1, 左愉婕1, 苏前富2, 刘宁1, 曹志艳1(), 董金皋1()   

  1. 1 河北农业大学植物保护学院/河北省植物生理与分子病理学重点实验室, 河北保定 071000
    2 吉林省农业科学院(中国农业科技东北创新中心)植物保护研究所, 吉林公主岭 136100
  • 收稿日期:2026-04-25 接受日期:2026-05-16 出版日期:2026-11-01 发布日期:2026-11-06
  • 通信作者:
    曹志艳,E-mail:。
    董金皋,E-mail:
  • 联系方式: 成明鑫,E-mail:xxqkxmail@163.com。陈稳产,E-mail:chenwenchan@hebau.edu.cn。成明鑫和陈稳产为同等贡献作者。
  • 基金资助:
    国家玉米产业技术体系(CARS-02-32); 河北省省属高等学校基本科研业务费(KY2025003)

Analysis of the Fungal Community Composition in Maize Kernels and the Toxigenic Capacity of Dominant Fusarium Species in China

CHENG MingXin1(), CHEN WenChan1(), WEI KaiWei1, ZHANG Sai1, ZUO YuJie1, SU QianFu2, LIU Ning1, CAO ZhiYan1(), DONG JinGao1()   

  1. 1 College of Plant Protection, Hebei Agricultural University/Key Laboratory of Hebei Province for Plant Physiology and Molecular Pathology, Baoding 071000, Hebei
    2 Institute of Plant Protection, Jilin Academy of Agricultural Sciences (Northeast Innovation Center for Agricultural Science and Technology), Gongzhuling 136100, Jilin
  • Received:2026-04-25 Accepted:2026-05-16 Published:2026-11-01 Online:2026-11-06

摘要:

【目的】明确我国玉米主产区籽粒中的病原组成、区域分布特征及其年度演替规律,系统分析玉米籽粒中优势病原的产毒特性,为储藏期玉米毒素污染控制及质量安全保障提供科学依据与数据支撑。【方法】2022—2025年连续4年在我国14个省(自治区)41个地区采集玉米籽粒样品并进行病原分离纯化,采用形态学和分子生物学方法对污染菌进行鉴定,统计病原种类和分离频率,分析其分布特征及动态变化;测定拟轮枝镰孢(Fusarium verticillioides)和禾谷镰孢(Fusarium graminearum)产毒能力,分析比较不同玉米产区拟轮枝镰孢和禾谷镰孢的产毒能力差异。【结果】共分离得到真菌5 885株,主要包括镰孢菌、青霉、黑曲霉(Aspergillus niger)、木霉、黄曲霉(Aspergillus flavus)和其他真菌,分离频率分别为67.82%、17.72%、7.31%、2.97%、2.70%和1.48%,其中镰孢菌分离频率最高,拟轮枝镰孢为优势真菌,4年累计分离获得3 061株,分离频率为52.01%,其次为禾谷镰孢、层出镰孢(Fusarium proliferatum)、尖孢镰孢(Fusarium oxysporum),分离频率分别为11.03%、3.14%、1.58%,黄色镰孢(Fusarium culmorum)仅在2022年检出3株。霉菌中青霉、黑曲霉为主要污染菌,分离频率分别为17.72%和7.31%。对分离获得的拟轮枝镰孢和禾谷镰孢进行产毒能力测定,结果显示,拟轮枝镰孢伏马毒素FB1产量范围在0.07—4 916.92 μg·g-1,FB2产量范围在0.02—5 573.14 μg·g-1,不同产区菌株产毒能力存在明显差异,黄淮海玉米产区菌株产毒能力较高,FB1和FB2最大值分别为4 916.92和5 573.14 μg·g-1;东北玉米产区次之,FB1和FB2最大值分别为2 070.29和468.51 μg·g-1;西北玉米产区整体产毒能力偏低、分布集中,高产毒菌株占比少,FB1和FB2最大值分别为20.91和30.76 μg·g-1;禾谷镰孢脱氧雪腐镰孢菌烯醇(呕吐毒素,DON)产量介于1.24—3.43 μg·g-1,东北、西北、黄淮海三大产区产毒区间分布相近,仅小幅变化,无显著地域性差异。【结论】拟轮枝镰孢是我国玉米籽粒的主要污染菌,区域间和年度间种群存在差异;不同产区间拟轮枝镰孢产伏马毒素能力存在差异,黄淮海与东北产区存在强产毒菌株。

关键词: 玉米籽粒, 菌群, 镰孢菌, 真菌毒素, 产毒能力

Abstract:

【Objective】This study aimed to clarify the composition, regional distribution characteristics, and annual succession patterns of pathogens in maize kernels from major maize-producing areas in China, systematically analyze the toxigenic capacity of dominant pathogens, and to provide scientific basis and data support for the control of mycotoxin contamination and the quality and safety assurance of maize during storage. 【Method】From 2022 to 2025, maize kernel samples were continuously collected from 41 regions across 14 provinces (autonomous regions) in China for four consecutive years, and pathogens were isolated and purified. Morphological and molecular biological methods were used to identify the contaminant fungi. The pathogen species and isolation frequency were counted to analyze their distribution characteristics and dynamic changes. The toxigenic capacity of Fusarium verticillioides and F. graminearum was determined, and the differences in toxigenic capacity of the two species among different maize-producing areas were analyzed and compared. 【Result】A total of 5 885 fungal strains were isolated, predominantly including Fusarium spp., Penicillium spp., Aspergillus niger, Trichoderma spp., A. flavus, and other fungi. Their corresponding isolation frequencies were 67.82%, 17.72%, 7.31%, 2.97%, 2.70%, and 1.48%, respectively. Among them, Fusarium spp. had the highest isolation frequency. Within the genus Fusarium, F. verticillioides was the predominant species. A total of 3 061 strains were isolated during the four-year investigation, accounting for 52.01% of the total strains. This was followed by F. graminearum, F. proliferatum, and F. oxysporum, with isolation frequencies of 11.03%, 3.14%, and 1.58%, respectively. F. culmorum was only detected in 2022 (3 strains). Among molds, Penicillium spp. and A. niger were the main contaminants, with isolation frequencies of 17.72% and 7.31%, respectively. The toxigenic capacity of the isolated F. verticillioides and F. graminearum were determined. The results showed that the FB1 production of F. verticillioides ranged from 0.07 to 4 916.92 μg·g-1, and FB2 ranged from 0.02 to 5 573.14 μg·g-1. Significant differences in toxigenic capacity were observed among strains from different production areas. Strains isolated from the Huang-Huai-Hai maize-producing area exhibited higher toxigenic capacity, with the maximum FB1 and FB2 production levels reaching 4 916.92 and 5 573.14 μg·g-1, respectively. The Northeast maize-producing area ranked second, with maximum FB1 and FB2 production levels of 2 070.29 and 468.51 μg·g-1. By contrast, the Northwest maize-producing area showed overall lower toxigenic capacity, with a concentrated distribution and a smaller proportion of high-toxin-producing strains; the maximum production levels of FB1 and FB2 were only 20.91 and 30.76 μg·g-1, respectively. The DON production of F. graminearum ranged from 1.24 to 3.43 μg·g-1. Overall the three major maize-producing areas (Northeast, Northwest, and Huang-Huai-Hai) exhibited similar toxigenic distribution patterns with only minor variations, and no significant regional differences were observed. 【Conclusion】F. verticillioides is the primary contaminant of maize kernels in China, with its population structure varying across regions and years. The toxigenic capacity (FB) of F. verticillioides varies significantly among different maize-producing areas, and high-toxin-producing strains are predominantly distributed in the Huang-Huai-Hai and Northeast maize-producing areas.

Key words: maize kernel, microbial community, Fusarium, mycotoxin, toxigenic capacity