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RELEASE OF BACTERIAL-DNA BY MARINE NANOFLAGELLATES, AN INTERMEDIATE STEP IN PHOSPHORUS REGENERATION
TURK, V; REHNSTAM, AS; LUNDBERG, E; HAGSTROM, A
1992
发表期刊APPLIED AND ENVIRONMENTAL MICROBIOLOGY
ISSN0099-2240
卷号58期号:11页码:3744-3750
摘要The concentrations of dissolved DNA and nanoflagellates were found to covary during a study of diel dynamics of the microbial food web in the Adriatic Sea. This observation was further investigated in a continuous seawater culture when nanoflagellates were fed bacteria grown in filtered seawater. Analysis of dissolved organic phosphorus and dissolved DNA showed a sixfold increase of dissolved DNA in the presence of the nanoflagellates (Ochromonas sp.). The amount of DNA released suggested that the majority of the consumed bacterial DNA was ejected. Phagotrophic nanoflagellates thus represent an important source of origin for dissolved DNA. The rate of breakdown of dissolved DNA and release of inorganic phosphorus in the pelagic ecosystem is suggested to be dependent on the ambient phosphate pool. In the P-limited northern Adriatic Sea, rapid degradation of the labelled DNA could be demonstrated, whereas the N-limited southern California bight water showed a much lower rate. Phosphorus originating from dissolved DNA was shown to be transferred mainly to organisms in the <3-mum-size fractions. On the basis of the C/P ratios, we suggest that a significant fraction of the phosphorus demand by the autotrophs may be sustained by the released DNA during stratified conditions. Thus, the nucleic acid-rich bacterial biomass grazed by protozoa plays an important role in the biogeochemical cycling of phosphorus in the marine environment.
部门归属INST BIOL,MARINE BIOL STN,CS-66330 PIRAN,CZECHOSLOVAKIA; UNIV UMEA,UMEA MARINE SCI CTR,S-90304 UMEA,SWEDEN; UMEA UNIV,DEPT MICROBIOL,S-90187 UMEA,SWEDEN
学科领域Biotechnology & Applied Microbiology ; Microbiology
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语种英语
文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/9374
专题海洋微食物网高被引文献
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TURK, V,REHNSTAM, AS,LUNDBERG, E,et al. RELEASE OF BACTERIAL-DNA BY MARINE NANOFLAGELLATES, AN INTERMEDIATE STEP IN PHOSPHORUS REGENERATION[J]. APPLIED AND ENVIRONMENTAL MICROBIOLOGY,1992,58(11):3744-3750.
APA TURK, V,REHNSTAM, AS,LUNDBERG, E,&HAGSTROM, A.(1992).RELEASE OF BACTERIAL-DNA BY MARINE NANOFLAGELLATES, AN INTERMEDIATE STEP IN PHOSPHORUS REGENERATION.APPLIED AND ENVIRONMENTAL MICROBIOLOGY,58(11),3744-3750.
MLA TURK, V,et al."RELEASE OF BACTERIAL-DNA BY MARINE NANOFLAGELLATES, AN INTERMEDIATE STEP IN PHOSPHORUS REGENERATION".APPLIED AND ENVIRONMENTAL MICROBIOLOGY 58.11(1992):3744-3750.
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