一株反硝化光合细菌的生物学特性及系统发育分析

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254陈慧等:一株反硝化光合细菌的生物学特性及系统发育分析. /微生物学报(2011)51(2) Biological characteristics and phylogenetic analysis of a denitrifying photosynthetic bacterium Hui Chen，Demin Zhang * ，

Longgang Wang，Zhichong Pan

Key Laboratory of Applied Marine Biotechnology ，

Ningbo University ，

Ministry of Education ，

Ningbo 315211 ， China Abstract :［

Objective ］

Nitrite accumulation in aquaculture water is toxic to reared animals. One of the solutions to this

problem is to apply denitrifying bacteria. This paper is intended to get a strain

of phototrophic bacteria for efficient removal of nitrite from aquaculture water. ［

Methods ］

We used soft agar to isolate and purify phototrophic bacteria. We investigated biological characteristics of the isolate by means of light and electronic observations，physical and chemical tests. We

analyzed its phylogenetical position based on the sequences of 16S rDNA and the gene that codes for photosynthetic reaction center subunit M ( pufM ) . ［

Results ］

A photosynthetic bacterial strain ，

named wps ，

showing high removal

efficiency of nitrite，was isolated from the freshwater ponds. Cells were Gram-negative，rod-shaped，slightly curved，0. 4 － 0. 6 × 1. 5 － 4. 0 μm

，motile by means of polar multiple flagella. Intracellular membranes were of the lamellar type. It grew

under facultative anaerobic conditions in the light with bacteriochlorophyll a and carotenoid of sppirilloxanthin series as photosynthetic pigment. The optimum growth was obtained at pH 5. 5 － 8. 5，in a range of 0 － 2% salinity and at 25 －

38℃ . The similarity of 16S rDNA between strain wps and Rhodopseudomonas palustris was 98. 9% and 94. 9% for pufM gene. However

，there are significant differences between them in the morphological and physiological characteristics，i. e. grew at pH 5. 5

;no growth photoautotrophicaly with sodium hydrogen carbonate;could not utilize citrate or formate as only

carbon source;required thiamine hydrochloride and calcium pantothenate as growth factors. ［Conclusion］Strain wps may represent a novel species in genus Rhodopseudomonas and possibly find its application in the bioremediation of polluted

aquaculture water. Keywords

: photosynthetic bacteria，Rhodopseudomonas，nitrite，denitrification (本文责编:王晋芳)

Suported by the Science and Technology Project of Ministry of Education (208053)，by the Program for Changjiang Scholars and Innovative Research Team in University

(PCSIRT) (IRT0734)，by the National Program for High Technology Research and Development of China(2007AA10Z409)，by

the Natural Science Foundation of Zhejiang Province ( R305333 ) and by the Project of scientific and technological Innovation of Ningbo (2007A31004，2004A610026) *

Corresponding auther. Tel: + 86-574-87600164;E-mail:zhangdemin@ nbu. edu. cn Received :

6 July 2010 / Revised:25 October 2010 255