云南烟草赤星病菌及近似种rDNA－ITS序列分析  

rDNA-ITS Sequence Analysis of Alternaria alternata in Yunnan and their Similar Species

作　　者：胡中会[1] 赵立华 严恩平 范静华[3] 孔宝华[3] 陈海如[3] 

机构地区：[1]文山学院生化系,云南文山663000 [2]云南省文山农业科学研究所,云南文山663000 [3]云南农业大学植物保护学院、农业生物多样性与病虫害控制教育部重点实验室,云南昆明650201

出　　处：《云南农业大学学报（自然科学版）》2012年第5期670-676,共7页Journal of Yunnan Agricultural University:Natural Science

基　　金：中烟公司科技计划项目(09YN005,2010YN18,2010YN19)

摘　　要：为了进一步研究云南省烟草赤星病病原的系统发育关系,提取28份供试菌株的菌丝基因组DNA,进行rDNA-ITS序列及两侧ITS序列扩增。28个供试菌株与GenBank中登录的链格孢属7个种(包括5个小孢子种Alternaria citri,A.alternata,A.longipes,A.mali,A.gaisen和2个大孢子种A.porri,A.solani)14个菌株的序列进行聚类分析:42个菌株明显地分成两支,供试菌株与5个小孢子种聚为一个分支,序列同源性高达99%～100%,没有明显的地域性差异;但另2个大孢子种聚为单独的一支,明显地与供试菌株和其他5个小孢子种区分开。rDNA ITSl-5.8S-ITS2序列在相对保守的基础上又存在一定变异,在一些菌物属的研究中可作为分类鉴定、分子标记、系统发育的重要依据,但通过对世界各地Alternaria菌株序列的分析发现,rDNAITS1-5.8S-ITS2仅能将大孢子种和小孢子种分开,还不能作为区分不同地域不同来源菌株的标准。To further study the phylogeny relations of Ahernaria ahernata, the mycelial genomic DNAwere extracted to amplify the rDNA-ITS sequences, and both sides of the ITS amplification. The results showed that： the sequence homology of the 28 tested strains and 5 smaller spore species including Al-ternaria citri, A. alternata, A. longipes, A. mali, A. gaisen by registered with the GenBank, was up to 99% - 100%, which had high homology and there was no obvious regional characteristics, however, other two larger spore types A. porri and A. solani were together for another cluster, which can beclearly and distinguished from other 5 small spores species and the 28 tested strains, rDNA ITS1-5.8S- ITS2 sequences exist a certain variation on the basis of a relatively conservative, which can be used asidentification, molecular markers, an important basis for phylogeny in some genera of fungi, but it was shown that rDNA ITS1-5.8S-ITS2 could only separate the megaspore and microspore species, and notdistinguish from the Alternaria strains collected from different sources around the world.

关 键 词：烟草赤星病 rDNA—ITS 序列分析 

分 类 号：S435.73[农业科学—农业昆虫与害虫防治]