Phoma stem canker disease on oilseed rape (Brassica napus) in China is caused by Leptosphaeria biglobosa 'brassicae'
文献类型: 外文期刊
作者: Liu, Ze 1 ; Latunde-Dada, Akinwunmi O. 2 ; Hall, Avice M. 1 ; Fitt, Bruce D. L. 1 ;
作者机构: 1.Univ Hertfordshire, Hatfield AL10 9AB, Herts, England
2.Rothamsted Res, Harpenden AL5 2JQ, Herts, England
3.Anhui Acad Agr Sci, Crop Res Inst, Hefei 230031, Anhui, Peoples R China
关键词: AFLP;Blackleg;Brassica napus;Genetic structure;ITS;Leptosphaeria biglobosa subclades;Phylogeny
期刊名称:EUROPEAN JOURNAL OF PLANT PATHOLOGY ( 影响因子:1.907; 五年影响因子:2.022 )
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收录情况: SCI
摘要: Phoma stem canker of oilseed rape (Brassica napus) is a globally important disease that is caused by the sibling ascomycete species Leptosphaeria maculans and L. biglobosa. Sixty fungal isolates obtained from oilseed rape stems with phoma stem canker disease symptoms collected from four provinces in China in 1999, 2005 and 2006 were all identified as Leptosphaeria biglobosa, not L. maculans, by PCR diagnostics based on species-specific primers. There were no differences in cultural characteristics (e.g. pigmentation and in vitro growth) between these L. biglobosa isolates from China and those of 37 proven L. biglobosa isolates from Europe or Canada. In studies using amplified fragment length polymorphism (AFLP) markers, Chinese L. biglobosa populations were genetically more similar to European L. biglobosa populations than to the more diverse Canadian L. biglobosa populations. Sequencing of gene fragments of beta-tubulin, actin and the internal transcribed spacer (ITS) region of rDNA from L. biglobosa isolates from China, Europe, Australia and Canada showed a closer taxonomic similarity of Chinese L. biglobosa to the European L. biglobosa 'brassicae' than to Canadian L. biglobosa 'canadensis' or to the Australian L. biglobosa 'occiaustralensis' or 'australensis' subclades. These results suggest that the Chinese L. biglobosa population in this study is in the same subclade as European L. biglobosa 'brassicae' populations.
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