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萘降解细菌的分离及其降解基因的分子检测

李永君;赵化冰;任河山;梁靖;蔡宝立   

  1. 南开大学微生物学系生物活性材料教育部重点实验室, 天津 300071
  • 收稿日期:2005-08-15 修回日期:2005-11-03 出版日期:2006-07-10 发布日期:2006-07-10

Isolation of naphthalenedegrading bacteria and molecular detection of their naphthalene-catabolic genes

LI Yongjun, ZHAO Huabing, REN Heshan, LIANG Jing, CAI Baoli   

  1. Key Laboratory of Bioactive Materials, Ministry of Education, Department of Microbiology, Nankai University, Tianjin 300071, China

  • Received:2005-08-15 Revised:2005-11-03 Online:2006-07-10 Published:2006-07-10

摘要: 从污水处理厂的活性污泥和石油工业废水中各分离到24个降解萘的细菌分离株,提取这些分离株的总DNA,然后与各种萘降解基因杂交。结果表明,这2个来源的分离株在萘降解基因的种类上有明显不同。来自工业废水的分离株含有萘双加氧酶的铁硫蛋白大亚基基因nahAc,水杨醛脱氢酶基因nahF及其重复基因nahV,水杨酸羟化酶基因nahG及其重复基因nahU,儿茶酚2,3-双加氧酶基因nahH和儿茶酚1,2-双加氧酶基因catA,以及萘趋化蛋白基因nahY。来自活性污泥的分离株只含有nahAc、nahF、nahG和catA,不含有nahY、nahV、nahU和nahH。

关键词: 越冬代, 尖钩宽黾蝽, 耐饥力, 温度, 密度

Abstract: In this paper, 24 naphthalene-degrading bacterial isolates were isolated respectively from wastewater treatment facility’s activated sludge and from petroleum wastewater. The total DNA of these isolates were extracted, and hybridized with several naphthalene-catabolic genes. The results indicated that the bacterial isolates isolated from the two sources were quite different in their contained naphthalene-degrading genes. The isolates from petroleum wastewater contained naphthalene dioxygenase Fe-S protein large subunit genenahAc, salicylaldehyde dehydrogenase gene nahF and its duplicate genenahV, salicylate hydroxylase genenahG and its duplicate gene nahU, catechol 2,3-dioxygenase gene nahH, catechol 1,2-dioxygenase gene catA, and naphthalene chemotaxis protein gene nahY, while those from activated sludge only contained nahAc, nahF, nahG and catA, but nonahY,nahV, nahU andnahH.

Key words: Hibernating generation, Microvelia horvathi, Hunger tolerance, Temperature, Density