Isolation, Identification and Characterization of Leptosphaerulina trifolii, the Causative Agent of Alfalfa Leptosphaerulina Leaf Spot in Inner Mongolia, China

文献类型： 外文期刊

第一作者： Huo, Hongli

作者： Huo, Hongli;Zhou, Hongyou;Huo, Hongli;Huangfu, Jiuru;Song, Peiling;Zhang, Dongmei;Shi, Zhidan;Li, Ziqin;Huo, Hongli;Zhou, Hongyou;Shi, Zhidan;Zhao, Lili;Zhao, Lili

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关键词： Leptosphaerulina leaf spot; alfalfa; Leptosphaerulina trifolii; morphology; pathogenicity

期刊名称：AGRONOMY-BASEL （ 影响因子：3.3； 五年影响因子：3.7 ）

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年卷期： 2024 年 14 卷 6 期

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收录情况： SCI

摘要： Leptosphaerulina leaf spot, caused by Leptosphaerulina trifolii, is a major disease of alfalfa (Medicago sativa), leading to noticeable losses. From 2022 to 2023, we collected samples of alfalfa with symptoms of the disease from different locations in Inner Mongolia, China. Nine fungal isolates recovered from these samples were identified through morphological traits and a maximum likelihood phylogeny based on concatenated partial sequences of ITS, 28S, and rpb2. A pathogenicity test on alfalfa confirmed the pathogenicity of the isolates on alfalfa. Analysis of physiological traits of L. trifolii revealed optimal mycelium growth at 20 degrees C and a pH range of 5 to 7, with soluble starch as the preferred carbon source and yeast extract as the optimal nitrogen source. The pathogen thrived in V8-juice agar and oat agar media. This study confirms L. trifolii as the causative agent of Leptosphaerulina leaf spot of alfalfa in Inner Mongolia and provides valuable insights into its optimal growth conditions. These findings enhance the understanding and management of this disease in alfalfa fields.

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