Random Amplified Polymorphic DNA-Based Analysis of Genetic Diversity and Characterization of Representative Bipolaris oryzae Isolates from 2023-2024.

IF 2.5 3区 农林科学 Q2 PLANT SCIENCES
Seoyeon Kim, Hyunjung Chung, Seol-Hwa Jang, Shinhwa Kim, Ki-Tae Kim, Sook-Young Park
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Abstract

Rice brown spot, caused by Bipolaris oryzae, typically occurs during the rice harvest season and can cause substantial yield losses. In 2023-2024, this disease emerged in rice cultivation areas of Korea. However, the population structure and genetic diversity of B. oryzae isolates remain unclear. Such information is necessary to effectively target and control rice brown spot. Thus, this study aimed to investigate the population structure of 50 B. oryzae isolates collected from the leaves, neck, and panicles of rice infected with brown spot through random amplified polymorphic DNA analysis. Among 140 primers tested, 30 were selected and applied, of which 5 exhibited significant polymorphisms among the isolates. The generated dendrogram revealed five clades with 92% similarity. Group A was the most predominant, comprising 84.0% of the total isolates (42/50), followed by Group C (8.0%, 4/50). Groups B, D, and E each contained one isolate (2%). These isolates were collected from the southern region of Korea and exhibited high genetic similarity (>95%). Two strains from Group A (F1305 and F1318) and one each from Groups B (F1248), C (F1253), D (F1317), and E (F1409) were selected and tested for their mycological characteristics and pathogenicity. Compared with the other strains, F1253, F1317, and F1409 exhibited higher conidial production and caused larger diseased leaf areas in the pathogenicity tests. These results suggest that the B. oryzae isolates that caused rice brown spot in 2023 are genetically homogeneous. This study may serve as a basis for developing targeted control strategies against brown spot.

基于随机扩增多态性dna的2023-2024年代表性稻瘟病菌分离株遗传多样性分析与特征分析。
水稻褐斑病是由稻瘟病双星虫引起的,通常发生在水稻收获季节,可造成严重的产量损失。从2023年到2024年,在韩国的水稻种植地区出现了该病。然而,米芽孢杆菌分离株的群体结构和遗传多样性尚不清楚。这些信息是有效防治水稻褐斑病所必需的。因此,本研究旨在通过随机扩增多态性DNA分析,对50株感染褐斑病的水稻叶片、颈部和穗部分离株的群体结构进行研究。从140个引物中筛选出30个,其中5个在分离株间表现出显著的多态性。生成的树突图显示,5个进化支的相似性为92%。以A群菌株最多,占84.0%(42/50),其次为C群(8.0%,4/50)。B、D、E组各1株(2%)。这些分离株来自韩国南部地区,具有较高的遗传相似性(约95%)。从A组(F1305和F1318)和B组(F1248)、C组(F1253)、D组(F1317)和E组(F1409)中各选择1株菌株进行真菌学特性和致病性检测。与其他菌株相比,F1253、F1317和F1409在致病性试验中表现出较高的分生孢子产量和较大的病叶面积。这些结果表明,2023年引起水稻褐斑病的米芽孢杆菌分离株具有遗传同质性。本研究可为制定针对性的褐斑病防治策略提供依据。
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
Plant Pathology Journal
Plant Pathology Journal 生物-植物科学
CiteScore
4.90
自引率
4.30%
发文量
71
审稿时长
12 months
期刊介绍: Information not localized
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