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Etiology and Symptoms of Maize Leaf Spot Caused by Bipolaris spp. in Sichuan China

机译：双极化菌属引起的玉米叶斑病的病因和症状。在中国四川

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摘要

Many species of the genus are important plant pathogens and often cause leaf spot, root rot, and seedling blight in an extremely wide range of hosts around the world. In recent years, maize leaf spot caused by species has frequently occurred with complex symptoms and is becoming increasingly serious in Sichuan Province of China. To investigate the population diversity of spp. and their corresponding symptoms in maize, 747 samples of maize leaf spot were collected from 132 sampling sites in 19 administrative districts of Sichuan Province from 2011 to 2018. Based on morphological characteristics, pathogenicity testing, and phylogenetic analysis of the rDNA internal transcribed spacer (ITS) and glyceraldehyde-3-phosphate dehydrogenase (GAPDH) genes, a total of 1186 isolates were identified as , , , , and , among which and were the dominant pathogenic species, accounting for 57.34% and 42.07% of the isolates, respectively. We found that isolates were mainly distributed in high altitude and cool mountainous areas, while was more widely distributed in Sichuan Province. The typical symptoms caused by the species were clearly distinct in maize. The typical symptoms caused by were elongated strip lesions, or fusiform, elliptical lesions, and those caused by were narrow linear lesions. Herein, was first reported on maize and caused subrotund lesions. This study provides useful information for disease diagnosis and management for leaf spot in maize.
机译：该属的许多物种是重要的植物病原体，通常在世界范围内的众多寄主中引起叶斑，根腐病和幼苗枯萎。近年来，由种引起的玉米叶斑病经常出现，症状复杂，在中国四川省变得越来越严重。调查物种的种群多样性。于2011年至2018年，从四川省19个行政区的132个采样点采集了747个玉米叶斑病的样品及其相应的玉米症状。 ）和甘油醛-3-磷酸脱氢酶（GAPDH）基因，共鉴定出1186株为，，，和，其中和为主要致病菌种，分别占菌株的57.34％和42.07％。我们发现，分离株主要分布在高海拔和凉爽的山区，而在四川省则更为广泛。该物种引起的典型症状在玉米中明显不同。引起的典型症状是细长条状病变或梭形，椭圆形病变，而狭窄的线性病变则引起。本文中，首次报道了玉米引起的圆形圆形病变。该研究为玉米叶斑病的诊断和处理提供了有用的信息。

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