Iron

Chapter
Part of the Developments in Applied Phycology book series (DAPH, volume 6)

Abstract

Iron is essential for algal growth, metabolism and function. Numerous proteins and enzymes require iron, including those involved in photosynthesis, respiration, as well as nitrogen assimilation and fixation. A variety of sources and sinks of iron in marine and freshwater ecosystems lead to a wide range of dissolved iron concentrations, from iron-limiting to iron-replete, for microalgal growth. Decades of physiological and molecular research, in combination with recent genomic advances, have made way for breakthroughs in our understanding of the critical roles iron plays in microalgal metabolism and how iron is acquired in aqueous environments. Herein, we review and integrate these studies to compare and contrast the iron requirements, acquisition abilities and strategies, as well as storage capacities of microalgae, with a particular emphasis on diatoms, green algae and cyanobacteria. These include the ability to perform substitution or the permanent replacement of iron-requiring proteins for non-iron containing functional equivalents, the presence of a high-affinity uptake system and the capacity to store iron in excess of cellular demand. We also include a discussion of iron-related topics of current significance, including iron-light co-limitation, effects of iron limitation on cellular elemental composition, large-scale iron fertilization experiments, and climate change effects on iron bioavailability. Lastly, a brief overview of some common laboratory and field techniques employed to study microalgal iron physiology is provided.

Keywords

Iron Requirements Transport Storage Limitation Fertilization 

Notes

Acknowledgements

We thank W.G. Sunda, P.J. Harrison and J.A. Raven for their helpful comments and insights on the manuscript. Supported by NSF-OCE 1334935 (A.M.).

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Copyright information

© Springer International Publishing Switzerland 2016

Authors and Affiliations

  1. 1.Department of Marine SciencesUniversity of North Carolina at Chapel HillChapel HillUSA
  2. 2.Department of Earth, Ocean and Atmospheric SciencesUniversity of British ColumbiaVancouverCanada

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