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确定影响美国东部西兰花的Alternaria叶病和头病的致病因子
Roy L Davis1, Daniel G Cerritos-Garcia1, Amelia G Martin1
1Department of Plant Science and Landscape Architecture, University of Connecticut, Storrs, CT 06269, U.S.A.
Plant disease
|May 22, 2025
概括
在西兰花田里没有发现日本的Alternaria,但Alternaria alternata被确定为致病性,导致类似于Alternaria brassicicola的Alternaria叶和头 (ABHR) 症状.
科学领域:
- 植物病理学 植物病理学
- 菌类学 菌类学是指菌类学.
- 农业科学 农业科学
背景情况:
- 替代叶病和头部腐烂 (ABHR) 是一种影响西兰花和相关作物的重大疾病.
- 主要病原体是Alternaria brassicicola,但最近在美国东部报告了Alternaria japonica.
- 准确识别Alternaria物种对于有效的疾病管理至关重要.
研究的目的:
- 在美国东部的西兰花田中评估Alternaria japonica与Alternaria brassicicola的分布和发生情况.
- 要确定一个常见的物种Alternaria alternata是否对西兰花具有致病性,并引起ABHR症状.
- 为了澄清影响商业西兰花的Alternaria病原体的物种组成.
主要方法:
- 在2022-2023年期间,在五个州的商业西兰花田 (有机和常规) 进行了多州病原体调查.
- 收集具有ABHR典型病变的西兰花叶片,用于病原体隔离.
- 使用主要过敏原a1基因的测序来识别Alternaria物种.
主要成果:
- 主要的物种是 Alternaria brassicicola (88-94%),其次是 Alternaria alternata (6-12%).
- 在任何被调查的田地中都没有检测到 Alternaria japonica.
- 在受控接种实验中,Alternaria alternata引起了类似ABHR的症状,证明了它对西兰花的致病性.
结论:
- 在美国东部的西兰花中,Alternaria brassicicola仍然是占主导地位的ABHR病原体.
- Alternaria alternata对西兰花具有致病性,其症状与A. brassicicola.无法区分.
- 未来的ABHR疾病调查必须包括最终的物种识别,对A. alternata影响的进一步研究是有必要的.
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