Nitrogen isotopic fractionation in the synthesis of photosynthetic pigments in Rhodobacter capsulatus and Anabaena cylindrica

被引：36

作者：

Beaumont, VI ^{[1
]}

Jahnke, LL ^{[1
]}

Des Marais, DJ ^{[1
]}

机构：

[1] NASA, Ames Res Ctr, Moffett Field, CA 94035 USA

来源：

ORGANIC GEOCHEMISTRY | 2000年 / 31卷 / 11期

基金：

美国国家航空航天局;

关键词：

N-isotopes; purple nonsulfur bacteria; cyanobacteria; bacteriochlorophyll a; chlorophyll a; nitrogen fixation; lipid biomarkers;

D O I：

10.1016/S0146-6380(00)00133-9

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

Nitrogen isotopic discrimination was investigated for a purple nonsulfur bacterium. Rhodobacter capsulatus, during photoheterotrophic and photoautotrophic growth with N-2 and ammonia, and compared with nitrogen assimilation in a cyanobacterium. In R. capsulatus, the Delta N-15 values for biomass during growth with N-2 fixation and ammonia assimilation. relative to the N-source, ranged from -1.8 to -0.8 parts per thousand and -12.3 to -10.2 parts per thousand respectively. In the cyanobacterium, Anabaena cylindrica, the Delta N-15 value for biomass resulting from growth on molecular nitrogen was -0.8 to -1.7 parts per thousand relative to N-source. These values are similar to those observed for other microorganisms. Bacteriochlorophyll a in R. capsulatus was depleted in N-15 relative to biomass, whereas chlorophyll a in A. cylindrica was relatively enriched in N-15. (C) 2000 Elsevier Science Ltd. All rights reserved.

引用

页码：1075 / 1085

页数：11

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