文献类型： 外文期刊
作者： Wang, Qing-Hai 1 ; Fan, Kun 3 ; Li, De-Wei 1 ; Niu, Shan-Guang 2 ; Hou, Li-Qun 2 ; Wu, Xiao-Qin 1 ;
作者机构： 1.Nanjing Forestry Univ, Coll Forestry, Coinnovat Ctr Sustainable Forestry Southern China, Nanjing 210037, Jiangsu, Peoples R China
2.Shandong Prov Acad Forestry, Jinan 250014, Shandong, Peoples R China
3.Shandong Inst Pomol, Tai An 271000, Shandong, Peoples R China
4.Connecticut Agr Expt Stn Valley Lab, 153 Cook Hill Rd, Windsor, CT 06095 USA
关键词： Coelomycete;Juglans;Multi-gene phylogeny;Sequence;Species complex
期刊名称：AUSTRALASIAN PLANT PATHOLOGY （ 影响因子：1.599； 五年影响因子：1.708 ）
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收录情况： SCI
摘要： The genus Colletotrichum includes a number of important plant pathogens, which cause anthracnose diseases on a broad range of hosts in the world. In recent years, walnut has been severely damaged by anthracnose disease in China with significant yield losses. Thus, it is necessary to verify the etiology of anthracnose on walnut using both morphological and molecular approaches. In 2014, walnut fruits with anthracnose symptoms were collected from five walnut orchards in Shandong Province, China, and 24 isolates were isolated. Among them, six similar single-spore isolates obtained were used for pathogenicity testing of walnut anthracnose. Acervuli were brown, circular and the average size was 50.4-101.8 mu m. Conidiophores were hyaline, septate, not branched or branching at the base, conidiogenous cells were enteroblastic, phialidic, hyaline, cylindrical, ampulliform. Conidia were single celled, smooth-walled with a large guttule, colorless, fusiform to cylindrical, and had obtuse to slightly rounded ends. The size of conidia was (11.6-)13-15(-16.2) x (4.1-)4.6-5.6(-6) mu m. Appressoria were brown, ovoid to ellipsoid or slightly irregularly to irregularly shaped, and the average size was 6.8-9 x 5.1-6.5 mu m. Pathogenicity of the isolates to fruits and leaves were compared, and genes from all six isolates were sequenced. The isolates were identified as C. siamense based on four-gene phylogenetic analyses (ribosomal DNA-ITS, GAPDH, ACT and CHS-1) and morphological as well as cultural characters. This is the first report of C. siamense as a causal agent of anthracnose of walnut in China.
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