First report of root rot on onion (Allium cepa) seedlings caused by Globisporangium irregulare in South Korea

IF 1.6 4区农林科学 Q3 PLANT SCIENCES

Canadian Journal of Plant Pathology Pub Date : 2022-10-31 DOI:10.1080/07060661.2022.2142299

O. Choi, B. Kang, Yeyeong Lee, J. Kwon, Jinwoo Kim

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引用次数: 2

Abstract

Abstract Severe root rot was observed in onion seedlings growing in nursery seedbeds in Changnyeong, South Korea in September 2021. The diseased onion seedlings showed symptoms including water-soaking, browning and blight, followed by seedling collapse. Three isolates were obtained from diseased onion seedlings, and their morphological characteristics were found to be similar to previously described Pythium species. Artificial inoculation with isolates produced identical symptoms to those observed in the original infection. Based on morphological characteristics, sequencing of rRNA gene internal transcribed spacer, ribosomal large subunit gene region, and cytochrome c oxidase subunit I gene region, and pathogenicity testing, the causative agent of root rot on the onion seedlings was identified as Globisporangium irregulare (formerly Pythium irregulare). This is the first report of root rot caused by G. irregulare on onion seedlings in Korea. The results of this study suggest that root rot may pose a severe threat to onion seedling cultivation.

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韩国洋葱（Allium cepa）幼苗根腐病的首次报告

摘要2021年9月，在韩国昌宁的苗圃中，洋葱幼苗出现严重根腐病。发病的洋葱幼苗表现出浸水、褐变和枯萎等症状，随后出现倒苗。从患病的洋葱幼苗中获得了三个分离株，发现它们的形态特征与先前描述的腐霉属物种相似。人工接种分离株产生的症状与原始感染中观察到的症状相同。根据形态特征、rRNA基因内转录间隔区、核糖体大亚基基因区和细胞色素c氧化酶亚基I基因区的测序以及致病性测试，确定洋葱幼苗根腐病的病原体为不规则球孢菌（Globisporgium irregular，前Pythium irregulare）。这是韩国首次报道由G.irregular引起的洋葱幼苗根腐病。这项研究的结果表明，根腐病可能对洋葱幼苗的培养构成严重威胁。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Canadian Journal of Plant Pathology 生物-植物科学

CiteScore

4.50

自引率

5.00%

发文量

审稿时长

6-12 weeks

期刊介绍： Canadian Journal of Plant Pathology is an international journal which publishes the results of scientific research and other information relevant to the discipline of plant pathology as review papers, research articles, notes and disease reports. Papers may be submitted in English or French and are subject to peer review. Research articles and notes include original research that contributes to the science of plant pathology or to the practice of plant pathology, including the diagnosis, estimation, prevention, and control of plant diseases. Notes are generally shorter in length and include more concise research results. Disease reports are brief, previously unpublished accounts of diseases occurring on a new host or geographic region. Review papers include mini-reviews, descriptions of emerging technologies, and full reviews on a topic of interest to readers, including symposium papers. These papers will be highlighted in each issue of the journal and require prior discussion with the Editor-in-Chief prior to submission.