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茄子烂秆病的病原鉴定

2017-08-08杨绍丽吴仁锋

湖北农业科学 2017年13期

杨绍丽++吴仁锋

摘要:从湖南省寄来茄子病样中分离出引起茄子烂秆病的病原真菌,对该菌进行了形态学观察、致病性测定及分子鉴定。结果表明,病原菌形态学鉴定为拟茎点霉(Phomopsis vexans)。对菌株HNQJ的核糖体RNA基因内转录间隔区(rDNA-ITS)进行PCR扩增和序列测定,并在GenBank中进行比对分析,根据rDNA-ITS序列分析结果结合病株症状和病菌的形态学特征,认为湖南茄子烂秆病的病原菌为拟茎点霉。

关键词:茄子烂秆;形态学;分子鉴定;rDNA-ITS分析

中图分类号:S436.411 文献标识码:A 文章编号:0439-8114(2017)13-2455-03

DOI:10.14088/j.cnki.issn0439-8114.2017.13.014

Identification of Pathogen Causing Eggplant Rotten Stem

YANG Shao-li, WU Ren-feng

(Institute of Vegetable, Wuhan Academy of Agricultural Science and Technology, Wuhan 430065, China)

Abstract: A pathogen causing eggplant rotten stem was isolated from disease samples selected in Hunan province, then the morphological observation, pathogenicity test and molecular identification were carried out. The result showed that the pathogen of Eggplant rotten stem was identified as Phomopsis vexans by morphology. The rDNA-ITS genes of isolate HNAJ were amplified and sequenced, then the results were compared and analyzed in GenBank. According to the sequence analysis, combining the symptom of diseased plants and the morphological characters of pathogen, the pathogen causing eggplant rotten stem of Hunan was identified as Phomopsis vexans.

Key words: eggplant rotten stem; morphology; molecular identification; rDNA-ITS analysis

湖南省瀏阳市茄子产区发生毁灭性烂秆病,从2010年的小面积发病到2011年、2012年连续两年大面积暴发,严重的区域甚至出现绝收,给农户造成极大的损失。该病从发现中心病株到全田枯死要2个多月,严重的到8月底至9月初时基本绝收。本研究收集并分离茄子烂秆病病样,进行病原菌分离、致病性测定和病原形态学和分子鉴定,以明确湖南地区茄子烂秆病的病原,为病害诊断和防治提供重要的理论依据。

1 材料与方法

1.1 病样来源

2011年和2012年从湖南省浏阳市寄来的茄子烂秆病病样。

1.2 病原菌的分离

病原菌的组织分离[1]:取典型带病茎秆,75%乙醇消毒,无菌水冲洗晾干,无菌刀片切取病健交界处小块组织,用0.1%升汞溶液表面消毒3~5 min,无菌水冲洗3次,吸干组织块表面水分,再将可能被杀死的组织剪去,接入PDA培养基,每皿3~5块,置25 ℃恒温箱中培养观察。菌丝萌发后,选典型菌落转接3次,5 d后用直径6 mm的打孔器,从菌落边缘打取菌饼,转接与PDA平板纯化培养。……

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