Distinct patterns of nitrate reductase activity in brown algae: light and ammonium sensitivity in Laminaria digitata is absent in Fucus species 1
Fucus and Laminaria species, dominant seaweeds in the intertidal and subtidal zones of the temperate North Atlantic, experience tidal cycles that are not synchronized with light:dark (L:D) cycles. To investigate how nutrient assimilation is affected by light cycles, the activity of nitrate reductase...
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crwiley:10.1111/j.1529-8817.2007.00403.x 2024-06-02T08:11:37+00:00 Distinct patterns of nitrate reductase activity in brown algae: light and ammonium sensitivity in Laminaria digitata is absent in Fucus species 1 Young, Erica B. Dring, Matthew J. Berges, John A. 2007 http://dx.doi.org/10.1111/j.1529-8817.2007.00403.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1529-8817.2007.00403.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1529-8817.2007.00403.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Phycology volume 43, issue 6, page 1200-1208 ISSN 0022-3646 1529-8817 journal-article 2007 crwiley https://doi.org/10.1111/j.1529-8817.2007.00403.x 2024-05-03T10:52:47Z Fucus and Laminaria species, dominant seaweeds in the intertidal and subtidal zones of the temperate North Atlantic, experience tidal cycles that are not synchronized with light:dark (L:D) cycles. To investigate how nutrient assimilation is affected by light cycles, the activity of nitrate reductase (NR) was examined in thalli incubated in outdoor tanks with flowing seawater and natural L:D cycles. NR activity in Laminaria digitata (Huds.) Lamour. showed strong diel patterns with low activities in darkness and peak activities near midday. This diel pattern was controlled by light but not by a circadian rhythm. In contrast, there was no diel variation in NR activity in Fucus serratus L., F. vesiculosus (L.) Lamour., and F. spiralis L. either collected directly from the shore or maintained in the outdoor tanks. In laboratory cultures, transfer to continuous darkness suppressed NR activity in L. digitata , but not in F. vesiculosus continuous light increased NR activity in L. digitata but decreased activity in F. vesiculosus . Furthermore, 4 d enrichment with ammonium (50 μmol · L −1 pulses), resulted in NR activity declining by >80% in L. digitata, but no significant changes in F. serratus . Seasonal differences in maximum NR activity were present in both genera with activities highest in late winter and lowest in summer. This is the first report of NR activity in any alga that is not strongly regulated by light and ammonium. Because light and tidal emersion do not always coincide, Fucus species may have lost the regulation of NR by light that has been observed in other algae and higher plants. Article in Journal/Newspaper North Atlantic Wiley Online Library Journal of Phycology 43 6 1200 1208 |
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English |
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Fucus and Laminaria species, dominant seaweeds in the intertidal and subtidal zones of the temperate North Atlantic, experience tidal cycles that are not synchronized with light:dark (L:D) cycles. To investigate how nutrient assimilation is affected by light cycles, the activity of nitrate reductase (NR) was examined in thalli incubated in outdoor tanks with flowing seawater and natural L:D cycles. NR activity in Laminaria digitata (Huds.) Lamour. showed strong diel patterns with low activities in darkness and peak activities near midday. This diel pattern was controlled by light but not by a circadian rhythm. In contrast, there was no diel variation in NR activity in Fucus serratus L., F. vesiculosus (L.) Lamour., and F. spiralis L. either collected directly from the shore or maintained in the outdoor tanks. In laboratory cultures, transfer to continuous darkness suppressed NR activity in L. digitata , but not in F. vesiculosus continuous light increased NR activity in L. digitata but decreased activity in F. vesiculosus . Furthermore, 4 d enrichment with ammonium (50 μmol · L −1 pulses), resulted in NR activity declining by >80% in L. digitata, but no significant changes in F. serratus . Seasonal differences in maximum NR activity were present in both genera with activities highest in late winter and lowest in summer. This is the first report of NR activity in any alga that is not strongly regulated by light and ammonium. Because light and tidal emersion do not always coincide, Fucus species may have lost the regulation of NR by light that has been observed in other algae and higher plants. |
format |
Article in Journal/Newspaper |
author |
Young, Erica B. Dring, Matthew J. Berges, John A. |
spellingShingle |
Young, Erica B. Dring, Matthew J. Berges, John A. Distinct patterns of nitrate reductase activity in brown algae: light and ammonium sensitivity in Laminaria digitata is absent in Fucus species 1 |
author_facet |
Young, Erica B. Dring, Matthew J. Berges, John A. |
author_sort |
Young, Erica B. |
title |
Distinct patterns of nitrate reductase activity in brown algae: light and ammonium sensitivity in Laminaria digitata is absent in Fucus species 1 |
title_short |
Distinct patterns of nitrate reductase activity in brown algae: light and ammonium sensitivity in Laminaria digitata is absent in Fucus species 1 |
title_full |
Distinct patterns of nitrate reductase activity in brown algae: light and ammonium sensitivity in Laminaria digitata is absent in Fucus species 1 |
title_fullStr |
Distinct patterns of nitrate reductase activity in brown algae: light and ammonium sensitivity in Laminaria digitata is absent in Fucus species 1 |
title_full_unstemmed |
Distinct patterns of nitrate reductase activity in brown algae: light and ammonium sensitivity in Laminaria digitata is absent in Fucus species 1 |
title_sort |
distinct patterns of nitrate reductase activity in brown algae: light and ammonium sensitivity in laminaria digitata is absent in fucus species 1 |
publisher |
Wiley |
publishDate |
2007 |
url |
http://dx.doi.org/10.1111/j.1529-8817.2007.00403.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1529-8817.2007.00403.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1529-8817.2007.00403.x |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Journal of Phycology volume 43, issue 6, page 1200-1208 ISSN 0022-3646 1529-8817 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1529-8817.2007.00403.x |
container_title |
Journal of Phycology |
container_volume |
43 |
container_issue |
6 |
container_start_page |
1200 |
op_container_end_page |
1208 |
_version_ |
1800757832976433152 |