Disassembling iron availability to phytoplankton
The bioavailability of iron to microorganisms and its underlying mechanisms have far reaching repercussions to many natural systems and diverse fields of research, including ocean biogeochemistry, carbon cycling and climate, harmful algal blooms, soil and plant research, bioremediation, pathogenesis...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2012-04-01
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| Series: | Frontiers in Microbiology |
| Subjects: | |
| Online Access: | http://journal.frontiersin.org/Journal/10.3389/fmicb.2012.00123/full |
| _version_ | 1819238781627138048 |
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| author | Yeala eShaked Yeala eShaked Hagar eLis Hagar eLis |
| author_facet | Yeala eShaked Yeala eShaked Hagar eLis Hagar eLis |
| author_sort | Yeala eShaked |
| collection | DOAJ |
| description | The bioavailability of iron to microorganisms and its underlying mechanisms have far reaching repercussions to many natural systems and diverse fields of research, including ocean biogeochemistry, carbon cycling and climate, harmful algal blooms, soil and plant research, bioremediation, pathogenesis and medicine. Within the framework of ocean sciences, short supply and restricted bioavailability of Fe to phytoplankton is thought to limit primary production and curtail atmospheric CO2 drawdown in vast ocean regions. Yet a clear-cut definition of bioavailability remains elusive, with elements of iron speciation and kinetics, phytoplankton physiology, light, temperature and microbial interactions, to name a few, all intricately intertwined into this concept. Here, in a synthesis of published and new data, we attempt to disassemble the complex concept of iron bioavailability to phytoplankton by individually exploring some of its facets. We distinguish between the fundamentals of bioavailability - the acquisition of Fe-substrate by phytoplankton - and added levels of complexity involving interactions among organisms, iron and ecosystem processes. We first examine how phytoplankton acquire free and organically-bound iron, drawing attention to the pervasiveness of the reductive uptake pathway in both prokaryotes and eukaryotes. Turning to acquisition rates, we propose to view the availability of various Fe-substrates to phytoplankton as spectrum rather than an absolute all or nothing. We then demonstrate the use of uptake rate constants to make comparisons across different studies, organisms, Fe compounds and environments, and for gauging the contribution of various Fe substrates to phytoplankton growth in situ. Last, we describe the influence of aquatic microorganisms on iron chemistry and fate by way of organic complexation and bio-mediated redox transformations and examine the bioavailability of these bio-modified Fe species. |
| first_indexed | 2024-12-23T13:41:41Z |
| format | Article |
| id | doaj.art-889df260c47d43fc9c050bb10df6cde4 |
| institution | Directory Open Access Journal |
| issn | 1664-302X |
| language | English |
| last_indexed | 2024-12-23T13:41:41Z |
| publishDate | 2012-04-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Microbiology |
| spelling | doaj.art-889df260c47d43fc9c050bb10df6cde42022-12-21T17:44:51ZengFrontiers Media S.A.Frontiers in Microbiology1664-302X2012-04-01310.3389/fmicb.2012.0012319361Disassembling iron availability to phytoplanktonYeala eShaked0Yeala eShaked1Hagar eLis2Hagar eLis3Hebrew UniversityInteruniversity Institute for Marine SciencesHebrew UniversityInteruniversity Institute for Marine SciencesThe bioavailability of iron to microorganisms and its underlying mechanisms have far reaching repercussions to many natural systems and diverse fields of research, including ocean biogeochemistry, carbon cycling and climate, harmful algal blooms, soil and plant research, bioremediation, pathogenesis and medicine. Within the framework of ocean sciences, short supply and restricted bioavailability of Fe to phytoplankton is thought to limit primary production and curtail atmospheric CO2 drawdown in vast ocean regions. Yet a clear-cut definition of bioavailability remains elusive, with elements of iron speciation and kinetics, phytoplankton physiology, light, temperature and microbial interactions, to name a few, all intricately intertwined into this concept. Here, in a synthesis of published and new data, we attempt to disassemble the complex concept of iron bioavailability to phytoplankton by individually exploring some of its facets. We distinguish between the fundamentals of bioavailability - the acquisition of Fe-substrate by phytoplankton - and added levels of complexity involving interactions among organisms, iron and ecosystem processes. We first examine how phytoplankton acquire free and organically-bound iron, drawing attention to the pervasiveness of the reductive uptake pathway in both prokaryotes and eukaryotes. Turning to acquisition rates, we propose to view the availability of various Fe-substrates to phytoplankton as spectrum rather than an absolute all or nothing. We then demonstrate the use of uptake rate constants to make comparisons across different studies, organisms, Fe compounds and environments, and for gauging the contribution of various Fe substrates to phytoplankton growth in situ. Last, we describe the influence of aquatic microorganisms on iron chemistry and fate by way of organic complexation and bio-mediated redox transformations and examine the bioavailability of these bio-modified Fe species.http://journal.frontiersin.org/Journal/10.3389/fmicb.2012.00123/fullIronspeciationuptakebioavailabilityredox reactionsBiogeochemsitry |
| spellingShingle | Yeala eShaked Yeala eShaked Hagar eLis Hagar eLis Disassembling iron availability to phytoplankton Frontiers in Microbiology Iron speciation uptake bioavailability redox reactions Biogeochemsitry |
| title | Disassembling iron availability to phytoplankton |
| title_full | Disassembling iron availability to phytoplankton |
| title_fullStr | Disassembling iron availability to phytoplankton |
| title_full_unstemmed | Disassembling iron availability to phytoplankton |
| title_short | Disassembling iron availability to phytoplankton |
| title_sort | disassembling iron availability to phytoplankton |
| topic | Iron speciation uptake bioavailability redox reactions Biogeochemsitry |
| url | http://journal.frontiersin.org/Journal/10.3389/fmicb.2012.00123/full |
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