Characterization of Pyrenophora Species Causing Brown Leaf Spot on Italian Ryegrass (Lolium multiflorum) in Southwestern China
文献类型： 外文期刊
作者： Xue, Longhai 1 ; Liu, Yong 7 ; Zhou, Su 8 ; White, James F. 9 ; Li, Chunjie 1 ;
作者机构： 1.Lanzhou Univ, State Key Lab Grassland Agroecosyst, Lanzhou 730020, Peoples R China
2.Lanzhou Univ, Key Lab Grassland Livestock Ind Innovat, Minist Agr & Rural Affairs, Lanzhou 730020, Peoples R China
3.Lanzhou Univ, Engn Res Ctr Grassland Ind, Minist Educ, Lanzhou 730020, Peoples R China
4.Lanzhou Univ, Gansu Tech Innovat Ctr Western China Grassland In, Lanzhou 730020, Peoples R China
5.Lanzhou Univ, Ctr Grassland Microbiome, Lanzhou 730020, Peoples R China
6.Lanzhou Univ, Coll Pastoral Agr Sci & Technol, Lanzhou 730020, Peoples R China
7.Sichuan Acad Agr Sci, Inst Plant Protect, Chengdu 610066, Peoples R China
8.Sichuan Acad Grassland Sci, Chengdu 611731, Peoples R China
9.Rutgers State Univ, Dept Plant Biol, New Brunswick, NJ 08901 USA
关键词： fungi; field crops; pathogen diversity; pathogen detection
期刊名称：PLANT DISEASE （ 影响因子：4.438； 五年影响因子：4.7 ）
ISSN： 0191-2917
年卷期： 2020 年 104 卷 7 期
页码：
收录情况： SCI
摘要： Drechslera leaf spot (DLS) caused by Pyrenophora (Drechslera) species is one of the most serious diseases affecting Italian ryegrass (Lolium multiflorum) in China. Between 2015 and 2018, this disease was observed in three Italian ryegrass fields in the province of Sichuan, China. Average leaf disease incidence was approximately 1 to 12% but could range up to 100%. Symptoms appeared as brown or tan spots surrounded by a yellow halo, or brown to dark brown net blotch; subsequently, spots increased in number and size, and they later covered a large area of leaf, eventually causing leaf death. In this study, 86 strains of Pyrenophora fungi were isolated from leaf lesions of Italian ryegrass. Coupled with phylogenetic analysis of the internal transcribed spacer region, partial 28S ribosomal RNA gene, and glyceraldehyde-3-phosphate dehydrogenase gene, morphological characteristics showed that Pyrenophora dictyoides and P. nobleae are associated with Italian ryegrass in southwest China. Pathogenicity tests confirmed that both species can infect Italian ryegrass, causing leaf spot, whereas the virulence of the two species differed; P. nobleae showed lower pathogenicity to Italian ryegrass. This is the first time that these two Pyrenophora species were formally reported on Italian ryegrass based on both morphological and molecular characters. Overall, this study improves knowledge of the Pyrenophora species associated with Italian ryegrass and provides a foundation for control of this disease in the future.
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