Trichodesmium – a widespread marine cyanobacterium with unusual nitrogen fixation properties
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TLDR
Current knowledge, related to the optimization of its diazotrophic capacity, is explored, from genomics to ecophysiological processes, via, for example, cellular differentiation (diazocytes) and temporal regulations, and suggest cellular research avenues that now ought to be explored.Abstract:
The last several decades have witnessed dramatic advances in unfolding the diversity and commonality of oceanic diazotrophs and their N2-fixing potential. More recently, substantial progress in diazotrophic cell biology has provided a wealth of information on processes and mechanisms involved. The substantial contribution by the diazotrophic cyanobacterial genus Trichodesmium to the nitrogen influx of the global marine ecosystem is by now undisputable and of paramount ecological importance, while the underlying cellular and molecular regulatory physiology has only recently started to unfold. Here, we explore and summarize current knowledge, related to the optimization of its diazotrophic capacity, from genomics to ecophysiological processes, via, for example, cellular differentiation (diazocytes) and temporal regulations, and suggest cellular research avenues that now ought to be explored.read more
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References
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Prochlorococcus, a Marine Photosynthetic Prokaryote of Global Significance
TL;DR: The present review critically assesses the basic knowledge acquired about Prochlorococcus both in the ocean and in the laboratory to determine its adaptation to nutrient-deprived environments.
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Trichodesmium, a Globally Significant Marine Cyanobacterium
TL;DR: N2 fixation by Trichodesmium is likely a major input to the marine and global nitrogen cycle.
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Iron and phosphorus co-limit nitrogen fixation in the eastern tropical North Atlantic
TL;DR: The results support the hypothesis that aeolian mineral dust deposition promotes nitrogen fixation in the eastern tropical North Atlantic and show that community primary productivity was nitrogen-limited, and that nitrogen fixation was co-limited by iron and phosphorus.
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Deletional bias and the evolution of bacterial genomes
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Unicellular cyanobacteria fix N2 in the subtropical North Pacific Ocean.
Jonathan P. Zehr,John B. Waterbury,Patricia J. Turner,Joseph P. Montoya,Enoma O. Omoregie,Grieg F. Steward,Andrew Hansen,David M. Karl +7 more
TL;DR: It is shown that there are unicellular cyanobacteria in the open ocean that are expressing nitrogenase, and are abundant enough to potentially have a significant role in N dynamics.