Isolation and Identification of Nocardia, A Pathogen of Nocardiosis in Largemouth Bass, Micropterus salmoides

JIANG Yiyi; LI Yanwei; ZHOU Suming; LI Anxing

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Isolation and Identification of Nocardia, A Pathogen of Nocardiosis in Largemouth Bass, Micropterus salmoides

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- Isolation and Identification of Nocardia, A Pathogen of Nocardiosis in Largemouth Bass, Micropterus salmoides
- Acta Scientiarum Naturalium Universitatis SunYatseni Vol. 51, Issue 1, Pages: 76-81(2012)
- 作者机构：
  
  中山大学水产品安全教育部重点实验室∥生物防治国家重点实验室∥生命科学学院,广东,广州,510275
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：2012，
  
  Published Online：25 January 2012，
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JIANG Yiyi, LI Yanwei, ZHOU Suming, et al. Isolation and Identification of Nocardia, A Pathogen of Nocardiosis in Largemouth Bass, Micropterus salmoides. [J]. Acta Scientiarum Naturalium Universitatis SunYatseni 51(1):76-81(2012)
DOI：

JIANG Yiyi, LI Yanwei, ZHOU Suming, et al. Isolation and Identification of Nocardia, A Pathogen of Nocardiosis in Largemouth Bass, Micropterus salmoides. [J]. Acta Scientiarum Naturalium Universitatis SunYatseni 51(1):76-81(2012) DOI：

摘要

加州鲈是我国南方的重要经济鱼类养殖品种，但近年病害问题十分突出。诺卡菌已成为危害加州鲈健康养殖的重要病原，目前对该病原菌的分离鉴定及种属类型的研究尚未见报道。国内首次从患病加州鲈体内分离得到诺卡菌，并最终确定了其病原种类是鰤鱼诺卡菌

Nocardia seriolea。

从患病加州鲈内分离到菌株NH090627，镜检发现该菌为革兰氏阳性的分支状杆菌。生理生化鉴定结果表明分离菌株与诺卡菌属

Nocardia

细菌的基本特征相符。回归感染试验证实菌株NH090627即为引起此次加州鲈结节病的病原菌。对该菌株的16S rDNA进行了扩增和序列分析发现，该菌株与诺卡菌属细菌的亲缘关系较近，且与鰤鱼诺氏菌

N. seriolea

JCM 3360的16S rDNA 序列同源性最高，达到99.9%。综合上述试验结果，我们将加州鲈结节病的病原菌鉴定为鰤鱼诺卡菌。为了指导该病的防控，还对该病原菌做了一系列药敏试验，结果显示，该菌株对氯霉素、链霉素、卡那霉素、四环素等抗生素敏感，但对磺胺类和氨苄青霉素有耐药性。

Abstract

Nocardiosis is a commercially important disease in cultured largemouth bass in China

causing substantial economic losses. However

the pathogen causing largemouth bass nocardiosis has not yet been isolated in China. In this study

a strain of

Nocardia

(designed as NH090627) was isolated from diseased largemouth bass reared in Nanhai

Guangdong. The bacteria appeared Grampositive

beadlike or long

slender

filamentous rods in shapes. The traditional physiological and biochemical methods showed that most of the phenotypes of strain NH090627 were similar to

Nocardia

. Phylogeny analysis with 16S rDNA showed that the strain NH090627 was branched into the same cluster as that of other species of

Nocardia

and had a higher identity with

Nocardia seriolae

JCM 3360

(99.9%). Based on morphological

physiological

biochemical properties and phylogenetic analysis

the filamentous rod bacterial was identified as

Nocardia seriolae.

Antimicrobial susceptibility assay showed that this strain was susceptible to chloramphenicol

streptomycin

kanamycin and tetracycline

but high resistant to sulphamethoxazole and ampicillin.

关键词

加州鲈鰤鱼诺卡菌生理生化特征16S rDNA药敏试验

Keywords

largemouth bassNocardia seriolaephysiological and biochemical properties16S rDNAdrug sensitivity test

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State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yatsen University, Guangzhou

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