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不同的玉米种群由多产的孔生产者组成:对性疾病循环的影响

Rebecca R Sweany¹, Brian M Mack¹, Solomon T Gebru²

¹Food and Feed Safety Research Unit, Southern Regional Research Center, U.S. Department of Agriculture, New Orleans, Louisiana, 70124.

|May 10, 2024

概括

与土壤菌株相比,适应玉米的Aspergillus flavus菌株产生更多的状体 (雄性雌性体),但较少的硬质体 (雌性雌性体). 这种与遗传差异相关的专业化影响了真菌的繁殖和种群动态,突出了虫在感染和受精中的作用.

科学领域:

菌类学和植物病理学
农业微生物学农业微生物学
人口遗传学人口遗传学

背景情况:

阿斯伯吉勒斯 (Aspergillus flavus) 是一种产生亚毒素的真菌,会感染玉米,花生和棉花等作物.
有证据表明,A. flavus的土壤和宿主植物种群可能是专门的.
了解菌和硬化菌生产的菌株差异对于疾病管理至关重要.

研究的目的:

评估和比较来自玉米和土壤的A. flavus菌株中的状菌和硬质菌的生产.
使用全基因组单核酸多态 (SNP) 数据,将生殖策略与基因型差异相关联.
研究这些差异对人口结构和性繁殖的影响.

主要方法:

从路易斯安那州的11个玉米和土壤田中分离出A. flavus菌株.
测量状体 (雄性结合体) 和结合体 (雌性结合体) 生产量.
全基因组测序和SNP分析以确定遗传关系和遗传学.

主要成果:

适应玉米的菌株比适应土壤的菌株产生了显著更多的菌体 (高达47倍),但比适应土壤的菌株产生更少的硬化体 (高达3000倍).
菌株被分为小 (S),大 (L) 和混合 (M) 硬化菌类型,与不同的遗传学分类相关.
康尼的生产与向玉米的迁移有积极的相关性,而的生产与玉米的迁移有负相关性.

结论:

A. flavus表现出与宿主协会和遗传分歧相关的生殖策略 (conidia vs. sclerotia) 的专业化.
土壤和玉米种群之间的相反的伴生体生产偏差影响了有效的繁殖种群规模.
在A. flavus种群中,性繁殖,由状植物作为传染性传播剂和肥料促进,是很重要的.

关键词:

非洲毒素结合体 (Aflatoxin conidia) 是一种女人的不孕不育能力.菌生态学菌生态学菌生命周期的生命周期菌的性周期是如何发生的利基化的专业化利基化的专业化

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