IRON-STIMULATED N-2 FIXATION AND GROWTH IN NATURAL AND CULTURED POPULATIONS OF THE PLANKTONIC MARINE CYANOBACTERIA TRICHODESMIUM SPP

被引：110

作者：

PAERL, HW ^{[1
]}

PRUFERTBEBOUT, LE ^{[1
]}

GUO, CZ ^{[1
]}

机构：

[1] NOAA, NATL MARINE FISHERIES SERV, BEAUFORT LAB, BEAUFORT, NC 28516 USA

来源：

APPLIED AND ENVIRONMENTAL MICROBIOLOGY | 1994年 / 60卷 / 03期

关键词：

D O I：

10.1128/AEM.60.3.1044-1047.1994

中图分类号：

Q81 [生物工程学（生物技术）]; Q93 [微生物学];

学科分类号：

071005 ; 0836 ; 090102 ; 100705 ;

摘要：

In light of recent proposals that iron (Fe) availability may play an important role in controlling oceanic primary production and nutrient flux, its regulatory impact on N-2 fixation and production dynamics was investigated in the widespread and biogeochemically important diazotrophic, planktonic cyanobacteria Trichodesmium spp. Fe additions, as FeCl3 and EDTA-chelated FeCl3, enhanced N-2 fixation (nitrogenase activity), photosynthesis (CO2 fixation), and growth (chlorophyll a production) in both naturally occurring and cultured (on unenriched oligotrophic seawater) Trichodesmium populations. Maximum enhancement of these processes occurred under FeEDTA-amended conditions. On occasions, EDTA alone led to enhancement. No evidence for previously proposed molybdenum or phosphorus limitation was found. Our findings geographically extend support for Fe limitation of N-2 fixation and primary production to tropical and subtropical oligotrophic ocean waters often characterized by Trichodesmium blooms.

引用

页码：1044 / 1047

页数：4

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