Startseite Long-term acclimation to UV radiation: effects on growth, photosynthesis and carbonic anhydrase activity in marine diatoms
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Long-term acclimation to UV radiation: effects on growth, photosynthesis and carbonic anhydrase activity in marine diatoms

  • Malko Rech , Jean-Luc Mouget , Annick Morant-Manceau , Rosa Philippe und Gérard Tremblin
Veröffentlicht/Copyright: 8. Dezember 2005
Botanica Marina
Aus der Zeitschrift Band 48 Heft 5

Abstract

Oyster-ponds are characterized by cyclical changes in the composition of the microalgal population, and are mainly colonized by diatoms. Species living in oyster-ponds experience higher levels of UV-R than those living in the ocean because of the low turbidity and shallow depth in ponds (where no stratification occurs). In artificial laboratory conditions, five marine Bacillariophyceae species commonly found in the oyster-ponds were acclimated to three artificial UV radiation (UV-R) treatments with differing durations (2.25 h, 5 h and 8 h) and intensities of exposure, but with the same daily UV-R dose (110 kJ m-2 d-1, unweighted) and UVB-R/UVA-R ratio (4.5%), equivalent to that observed in the natural medium. Benthic species were able to sustain active growth, in contrast to the pelagic Skeletonema costatum that failed to acclimate. Amphora coffeaeformis was the only acclimated species that did not display any significant decrease, or even change in photosynthesis-related pigments and chlorophyll a (Chl a) content when acclimated to UV-R. The other acclimated species showed different patterns of pigment content change, depending on their ability to sustain an active growth rate under UV-R exposure: Haslea ostrearia accumulated photoprotective pigments and exhibited increased diatoxanthin-diadinoxanthin content. The pigment content of Entomoneis paludosa was only slightly modified by the longest UV-R exposure, and Phaeodactylum tricornutum exhibited a marked increase in Chl a turnover, coupled with accumulation of Chl c. In all acclimated species, photosynthesis-related parameters were differently, but in general moderately, affected by UV-R treatments, with a decrease of less than 50% in the maximum photosynthetic capacity. Some species exposed to UV-R exhibited similar or higher photosynthetic capacities than the controls. Carbonic anhydrase activity was strongly enhanced in UV-R tolerant species. Correlation between carbonic anhydrase activity and UV-R tolerance (i.e., ability to sustain active growth rate) in UV-R acclimated algae was established for all the acclimated species. This original finding is concordant with other results that suggest UV-R might play a role in the shift in species composition, since in oyster ponds, Skeletonema costatum, which is usually the dominant species, was the most sensitive diatom under the UV-R conditions tested here.

Keywords: acclimation; carbonic anhydrase activity; diatoms; photosynthesis; UV radiation
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Published Online: 2005-12-08
Published in Print: 2005-12-01

©2005 by Walter de Gruyter Berlin New York

Artikel in diesem Heft

  1. Author index volume 48 (2005)
  2. Contents volume 48 (2005)
  3. Genus/Species index volume 48 (2005)
  4. Special Issues of Botanica Marina
  5. 5th Asia Mycological Congress and 9th International Marine and Freshwater Mycology Symposium, Chiang Mai, Thailand, 14–19 November 2004
  6. Molecular approaches for assessing fungal diversity in marine substrata
  7. Diversity of marine fungi from Egyptian Red Sea mangroves
  8. Marine fungi from the Bahamas Islands
  9. Marine fungi on Nypa fruticans in Thailand
  10. Abundance of thraustochytrids on fallen decaying leaves of Kandelia candel and mangrove sediments in Futian National Nature Reserve, China
  11. Screening of marine fungi for lignocellulose-degrading enzyme activities
  12. Properties of the docosahexaenoic acid-producer Schizochytrium mangrovei Sk-02: effects of glucose, temperature and salinity and their interaction
  13. A systematic reassessment of the marine ascomycetes Torpedospora and Swampomyces
  14. Long-term acclimation to UV radiation: effects on growth, photosynthesis and carbonic anhydrase activity in marine diatoms
  15. Histioneis (Dinophysiales, Dinophyceae) from the western Pacific Ocean
  16. Molecular investigation reveals epi/endophytic extrageneric kelp (Laminariales, Phaeophyceae) gametophytes colonizing Lessoniopsis littoralis thalli
  17. Total dietary fiber content in Hawaiian marine algae
  18. The antibacterial compound sulphoglycerolipid 1-0 palmitoyl-3-0(6′-sulpho-α-quinovopyranosyl)-glycerol from Sargassum wightii Greville (Phaeophyceae)
  19. Evidence for vertical growth in Zostera noltii Hornem.
  20. Acknowledgement volume 48 (2005)
https://doi.org/10.1515/BOT.2005.054
Schlagwörter für diesen Artikel
acclimation; carbonic anhydrase activity; diatoms; photosynthesis; UV radiation

Artikel in diesem Heft

  1. Author index volume 48 (2005)
  2. Contents volume 48 (2005)
  3. Genus/Species index volume 48 (2005)
  4. Special Issues of Botanica Marina
  5. 5th Asia Mycological Congress and 9th International Marine and Freshwater Mycology Symposium, Chiang Mai, Thailand, 14–19 November 2004
  6. Molecular approaches for assessing fungal diversity in marine substrata
  7. Diversity of marine fungi from Egyptian Red Sea mangroves
  8. Marine fungi from the Bahamas Islands
  9. Marine fungi on Nypa fruticans in Thailand
  10. Abundance of thraustochytrids on fallen decaying leaves of Kandelia candel and mangrove sediments in Futian National Nature Reserve, China
  11. Screening of marine fungi for lignocellulose-degrading enzyme activities
  12. Properties of the docosahexaenoic acid-producer Schizochytrium mangrovei Sk-02: effects of glucose, temperature and salinity and their interaction
  13. A systematic reassessment of the marine ascomycetes Torpedospora and Swampomyces
  14. Long-term acclimation to UV radiation: effects on growth, photosynthesis and carbonic anhydrase activity in marine diatoms
  15. Histioneis (Dinophysiales, Dinophyceae) from the western Pacific Ocean
  16. Molecular investigation reveals epi/endophytic extrageneric kelp (Laminariales, Phaeophyceae) gametophytes colonizing Lessoniopsis littoralis thalli
  17. Total dietary fiber content in Hawaiian marine algae
  18. The antibacterial compound sulphoglycerolipid 1-0 palmitoyl-3-0(6′-sulpho-α-quinovopyranosyl)-glycerol from Sargassum wightii Greville (Phaeophyceae)
  19. Evidence for vertical growth in Zostera noltii Hornem.
  20. Acknowledgement volume 48 (2005)
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