Susceptibility of algae to Cr toxicity reveals contrasting metal management strategies
At the Paleozoic–Mesozoic boundary, the dominance of marine eukaryotic algae shifted from the green (chlorophyll b) to the red (chlorophyll c) superfamily. Selection pressures caused by the bioavailability of trace metals associated with increasing oxygenation of the ocean may have played a key role...
| Main Authors: | , , |
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| Format: | Journal article |
| Language: | English |
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Wiley
2019
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| _version_ | 1797083289030230016 |
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| author | Wilson, W Zhang, Q Rickaby, R |
| author_facet | Wilson, W Zhang, Q Rickaby, R |
| author_sort | Wilson, W |
| collection | OXFORD |
| description | At the Paleozoic–Mesozoic boundary, the dominance of marine eukaryotic algae shifted from the green (chlorophyll b) to the red (chlorophyll c) superfamily. Selection pressures caused by the bioavailability of trace metals associated with increasing oxygenation of the ocean may have played a key role in this algal revolution. From a scan of elemental compositions, a significant difference in the cellular Cr/P quota was found between the two superfamilies. Here, the different responses to high levels of Cr exposure reveal contrasting strategies for metal uptake and homeostasis in these algal lineages. At high Cr(VI) concentrations, red lineages experience growth inhibition through reduced photosynthetic capability, while green lineages are completely unaffected. Moreover, Cr(VI) has a more significant impact on the metallomes of red lineage algae, in which metal/P ratios increased with increasing Cr(VI) concentration for many trace elements. Green algae have higher specificity transporters to prevent Cr(VI) from entering the cell, and more specific intracellular stores of Cr within the membrane fraction than the red algae, which accumulate more Cr mistakenly in the cytosol fraction via lower affinity transport mechanisms. Green algal approaches require greater nutrient investments in the more numerous transport proteins required and management of specific metals, a strategy better adapted to the resource‐rich coastal waters. By contrast, the red algae are nutrient‐efficient with fewer and less discriminate metal transporters, which can be fast and better adapted in the oligotrophic, oxygenated open ocean, which has prevailed since the deepening of the oxygen minimum zones at the start of the Mesozoic era. |
| first_indexed | 2024-03-07T01:39:38Z |
| format | Journal article |
| id | oxford-uuid:9666f150-3ee1-4b58-868a-ff8f064197ce |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T01:39:38Z |
| publishDate | 2019 |
| publisher | Wiley |
| record_format | dspace |
| spelling | oxford-uuid:9666f150-3ee1-4b58-868a-ff8f064197ce2022-03-26T23:52:39ZSusceptibility of algae to Cr toxicity reveals contrasting metal management strategiesJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:9666f150-3ee1-4b58-868a-ff8f064197ceEnglishSymplectic Elements at OxfordWiley2019Wilson, WZhang, QRickaby, RAt the Paleozoic–Mesozoic boundary, the dominance of marine eukaryotic algae shifted from the green (chlorophyll b) to the red (chlorophyll c) superfamily. Selection pressures caused by the bioavailability of trace metals associated with increasing oxygenation of the ocean may have played a key role in this algal revolution. From a scan of elemental compositions, a significant difference in the cellular Cr/P quota was found between the two superfamilies. Here, the different responses to high levels of Cr exposure reveal contrasting strategies for metal uptake and homeostasis in these algal lineages. At high Cr(VI) concentrations, red lineages experience growth inhibition through reduced photosynthetic capability, while green lineages are completely unaffected. Moreover, Cr(VI) has a more significant impact on the metallomes of red lineage algae, in which metal/P ratios increased with increasing Cr(VI) concentration for many trace elements. Green algae have higher specificity transporters to prevent Cr(VI) from entering the cell, and more specific intracellular stores of Cr within the membrane fraction than the red algae, which accumulate more Cr mistakenly in the cytosol fraction via lower affinity transport mechanisms. Green algal approaches require greater nutrient investments in the more numerous transport proteins required and management of specific metals, a strategy better adapted to the resource‐rich coastal waters. By contrast, the red algae are nutrient‐efficient with fewer and less discriminate metal transporters, which can be fast and better adapted in the oligotrophic, oxygenated open ocean, which has prevailed since the deepening of the oxygen minimum zones at the start of the Mesozoic era. |
| spellingShingle | Wilson, W Zhang, Q Rickaby, R Susceptibility of algae to Cr toxicity reveals contrasting metal management strategies |
| title | Susceptibility of algae to Cr toxicity reveals contrasting metal management strategies |
| title_full | Susceptibility of algae to Cr toxicity reveals contrasting metal management strategies |
| title_fullStr | Susceptibility of algae to Cr toxicity reveals contrasting metal management strategies |
| title_full_unstemmed | Susceptibility of algae to Cr toxicity reveals contrasting metal management strategies |
| title_short | Susceptibility of algae to Cr toxicity reveals contrasting metal management strategies |
| title_sort | susceptibility of algae to cr toxicity reveals contrasting metal management strategies |
| work_keys_str_mv | AT wilsonw susceptibilityofalgaetocrtoxicityrevealscontrastingmetalmanagementstrategies AT zhangq susceptibilityofalgaetocrtoxicityrevealscontrastingmetalmanagementstrategies AT rickabyr susceptibilityofalgaetocrtoxicityrevealscontrastingmetalmanagementstrategies |