Light dependence of [3H]leucine incorporation in the oligotrophic North Pacific ocean

Applied and Environmental Microbiology
Matthew J ChurchDavid M Karl

Abstract

The influence of irradiance on bacterial incorporation of [(3)H]leucine was evaluated at Station ALOHA in the oligotrophic North Pacific subtropical gyre. Six experiments were conducted on three cruises to Station ALOHA to examine how [(3)H]leucine incorporation varied as a function of irradiance. Two experiments were also conducted to assess the photoautotrophic response to irradiance (based on photosynthetic uptake of [(14)C]bicarbonate) in both the upper and lower photic zones. Rates of [(3)H]leucine incorporation responded to irradiance in a photosynthesis-like manner, increasing sharply at low light and then saturating and sometimes declining with increasing light intensity. The influence of irradiance on bacterial growth was evaluated in both the well-lit (5 to 25 m) and dimly lit regions of the upper ocean (75 to 100 m) to determine whether the bacterial response to irradiance differed along the depth-dependent light gradient of the photic zone. [(3)H]leucine incorporation rates were analyzed with a photosynthesis-irradiance model for a quantitative description of the relationships between [(3)H]leucine incorporation and irradiance. Maximum rates of [(3)H]leucine incorporation in the upper photic zone increased 48 to 92%...Continue Reading

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Citations

Jul 29, 2008·Microbial Ecology·Olivier PringaultEmma Rochelle-Newall
May 14, 2008·Nature Reviews. Microbiology·Jed A FuhrmanUlrich Stingl
Jun 9, 2009·Applied and Environmental Microbiology·Matthew T Cottrell, David L Kirchman
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Dec 10, 2021·Biochemical Society Transactions·Benjamin A FordBhumika S Shah

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