Cytospora species associated with canker disease of three anti-desertification plants in northwestern China
Cytospora species associated with canker disease of three anti-desertification plants in northwestern China
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西北地区三种防沙植物溃疡病相关的细胞孢子菌属
DOI：
10.11646/phytotaxa.197.4.1
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发表时间：
2015-02-19
期刊：
影响因子：
1.1
通讯作者：
Tian, Cheng-Ming
中科院分区：
文献类型：
--
作者：
Fan, Xin-Lei;Hyde, Kevin D.;Tian, Cheng-Ming
胞孢菌属是引起植物溃疡病的重要病原菌，分布广泛，寄主范围广。然而，由于系统发育的理解和缺乏测序的模式种，分类群的物种水平的鉴定是困难的。在中国、伊朗和南非的桉树和苹果属等几种重要寄主上进行了形态学和系统发育研究。对我国西北地区荒漠化防治植物沙枣、沙棘和沙柳的溃疡病进行了调查研究。ITS、nrLSU、RPB 2和ACT基因区的多位点系统发育分析，结合详细的形态学分析和与ex-type菌株的比较，揭示了6个胞孢属种，C. chrysosperma、金鱼藻C. elaeagni、胡颓子C. hippophaes，C. nivea，C. populina comb. nov.和C. gigaspora sp. nov.引起这些寄主溃疡。新种C. gigaspora具有扁平的多室，具有概念和异常长的12 µm分生孢子。详细的描述和分子数据的胞孢属物种引起溃疡的三个嗜沙寄主植物。胡颓子胞孢（Cytospora elaeagni）和胡颓子胞孢（C.在沙枣和沙棘中发现了引起溃疡病的沙棘属真菌，而在沙枣和沙柳中发现的引起溃疡病的细胞孢子菌属真菌则是新记录。
Cytospora species are important phytopathogens causing severe canker disease with a worldwide distribution and broad host range. However, identification of taxa to species level is difficult due to poor phylogenetic understanding and lack of sequenced type species. Morphological and phylogenetic studies have been carried out on several important hosts such as Eucalyptus and Malus in China, Iran, and South Africa. In this study destructive canker diseases of the anti-desertification plants, Elaeagnus angustifolia , Hippophae rhamnoides , and Salix psammophila , were investigated in northwest China. Multilocus phylogenetic analyses of ITS, nrLSU, RPB2, and ACT gene regions, combined with detailed morphological analyses and comparison with ex-type strains revealed six Cytospora species, C. chrysosperma , C. elaeagni , C. hippophaes , C. nivea , C. populina comb. nov. and C. gigaspora sp. nov. causing cankers on these hosts. The novel species C. gigaspora has flat multiple locules with a conceptacle and unusually long 12 µm conidia. Detailed descriptions and molecular data for the Cytospora species causing cankers on the three psammophilic host plants are provided. Cytospora elaeagni and C. hippophaes have previously been recorded from Elaeagnus angustifolia and Hippophae rhamnoides , whereas the other species causing Cytospora canker of Elaeagnus angustifolia and Salix psammophila are new records.