食品科学

• 安全检测 • 上一篇    下一篇

凡纳滨对虾腐败优势菌的分离鉴定及其群体感应信号分子测定

李 灿,张煜琛,孙力军*,王雅玲,梁美晶,胡汉桥,徐德峰,刘 颖,叶日英   

  1. 广东海洋大学食品科技学院,广东省水产品加工与安全重点实验室,广东 湛江 524088
  • 出版日期:2016-04-25 发布日期:2016-04-13

Isolation and Identification of Dominant Spoilage Bacteria from Litopenaeus vannamei and Detection of Quorum Sensing Signaling Molecules

LI Can, ZHANG Yuchen, SUN Lijun*, WANG Yaling, LIANG Meijing, HU Hanqiao, XU Defeng, LIU Ying, YE Riying   

  1. Guangdong Provincial Key Laboratory of Aquatic Product Processing and Safety, College of Food Science and Technology, Guangdong Ocean University, Zhanjiang 524088, China
  • Online:2016-04-25 Published:2016-04-13

摘要:

从凡纳滨对虾中分离和鉴定腐败优势菌,并对其进行群体感应信号分子AHLs和AI-2的测定。通过细菌自动生化鉴定系统和16S rDNA序列鉴定优势腐败菌;利用生物检测菌根癌农杆菌(Agrobacterium tumefaciens)JZA-1测定其AHLs、哈维弧菌(Vibrio harveyi)BB170检测其AI-2,并探究其动态生成规律。最终分离得到10 株腐败优势菌,有4 株菌均为变形杆菌属(Proteus),其他分别为Oceanisphaera profunda、溶血性葡萄球菌(Stapylococcushaemolyticus)、腐败希瓦氏菌(Shewanella putrefaciens)、短杆菌属(Brevibacterium)、Bacillus siamensis、Exiguobacterium aaestuarii。分离腐败优势菌中的6 株革兰氏阴性菌均产生AHLs信号分子;变形杆菌属、腐败希瓦氏菌、短杆菌属、Bacillus siamensis产生AI-2信号分子。优势腐败菌的AHLs活性与菌体生长密度呈正相关,AI-2产生量在菌体生长对数期累积,在菌体生长24 h后活性迅速减弱。

关键词: 凡纳滨对虾, 优势腐败菌, 群体感应, 信号分子

Abstract:

This study was aimed at isolating, identifying the dominant spoilage bacteria from Litopenaeus vannamei using
an automatic biochemical identification system and 16S rDNA sequence, detecting the quorum sensing signaling molecules
acyl homoserine lactones (AHLs), autoinducer-2 (AI-2) and exploring the dynamic formation regularities with indicator
bacteria Agrobacterium tumefaciens JZA-1 and Vibrio harveyi BB170, respectively. Ten strains were selected and identified,
including Oceanisphaera profunda, Stapylococcus haemolyticus, Shewanella putrefaciens, Brevibacterium sp., Bacillus
siamensis, Exiguobacterium aaestuarii and four strains of the Proteus genus. All the Gram-negative spoilage organisms isolated
secreted signaling molecule AHLs while Proteus sp., Shewanella putrefaciens, Brevibacterium sp. and Bacillus siamensis secreted
signaling molecule AI-2. The AHLs activity of dominant spoilage organism was positively correlated with cell density. The AI-2
production was accumulated within the logarithmic phase and decreased rapidly from 24 h onwards.

Key words: Litopenaeus vannamei, dominant spoilage organism, quorurm sensing, signaling molecule

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