First report of Leptosphaeria sclerotioides on Brassica napus in Northwestern China  

作　　者：Mingxue Shang Xing Lyv Jing Zhang Mingde Wu Long Yang Qingxia Guan Guoqing Li 

机构地区：[1]State Key Laboratory of Agricultural Microbiology and Key Laboratory of Plant Pathology of Hubei Province,Huazhong Agricultural University,Wuhan,430070,China [2]Longxi Agricultural Technology Extension Center,Longxi County,Gansu Province,Longxi,748199,China

出　　处：《Oil Crop Science》2023年第2期73-80,共8页中国油料作物学报(英文版）

基　　金：supported by the Earmarked Fund for CARS-12 from National Modern Agricultural Technology System.

摘　　要：In 2020,diseased seedlings of winter oilseed rape(Brassica napus)with cankered taproots as well as abundant sclerotium-like structures in the soil surrounding the roots were found in Longxi County of Gansu province of northwestern China.A fungus with production of pycnidia was isolated from the diseased roots,and it was identified based on morphological characteristics,molecular phylogeny(ITS,LSU)and PCR detection with the specific primers.The fungus was identified as Leptosphaeria sclerotioides Gruyter,Aveskamp&Verkley[anamorph:Phoma sclerotioides(Preuss)ex Sacc.].Re-inoculation of isolates of P9 and P10 of L.sclerotioides on winter oilseed rape(B.napus cultivar‘Zhongshuang No.9’)in Wuhan caused formation of abundant sclerotium-like structures in soil surrounding the roots,but failed to produce root cankers as those observed in Gansu possibly due to lack of long peroid of low-temperature conditioning in Wuhan.In spite of this,plant height,pod number and seed yield of oilseed rape were significantly reduced in the treatment with L.sclerotioides P9 and P10,compared to the control treatment.To the best of our knowledge,this is the first report of L.sclerotioides on B.napus in China and the finding broadened our understanding about the natural distribution of this psychrophilic fungus.

关 键 词：Leptosphaeria sclerotioides Brassica napus China 

分 类 号：S435.654[农业科学—农业昆虫与害虫防治]