Effect of nutrient supply on photosynthesis and pigmentation to short-term stress (UV radiation) in Gracilaria conferta (Rhodophyta)

F. L. Figueroa, A. Israel, A. Neori, B. Martínez, E. J. Malta, A. Put, S. Inken, R. Marquardt, R. Abdala, N. Korbee

Research output: Contribution to journalArticlepeer-review

Abstract

The effects of increased photosynthetic active radiation (PAR), UV radiation (UVR), and nutrient supply on photosynthetic activity, pigment content, C:N ratio and biomass yield were studied in tank cultivated Gracilaria conferta (Rhodophyta). Electron transport rate (ETR) and biliprotein content were higher under high nutrient supply (HNS), obtained from fishpond effluents, compared to low nutrient supply (LNS), in contrast to mycosporine-like amino acids (MAAs) dynamic. The high MAA content in LNS-algae could be explained by higher UVR penetration in the thallus and by the competition for the use of nutrients with other processes. Effective quantum yield decreased after short-term exposure to high irradiance whereas full recovery in shade was produced only under slightly heat shock. UVA radiation provoked an additional decrease in photosynthesis under high water temperature. UVB radiation reversed UVA's negative effect mainly with HNS. Results support that nutrient-sufficiency help G. conferta to resist environmental changes as short-term temperature increase.

Original languageEnglish
Pages (from-to)1768-1778
Number of pages11
JournalMarine Pollution Bulletin
Volume60
Issue number10
DOIs
StatePublished - Oct 2010
Externally publishedYes

Bibliographical note

Funding Information:
This study was made during the 8th International Workshop of Group for Aquatic Primary Productivity (GAP) and Batsheva de Rothschild Seminar on Gross and Net Primary Productivity held at the Interuniversity Institute for Marine Sciences, Eilat, Israel in April 2008. The experiments were made in the Israeli National Center for Mariculture, Eilat. The particular help of Y. Alfia, Y. Chernov, M. Fediuk and S. Trushin is acknowledged. We thank the Batsheva de Rothschild Foundation, Bar Ilan University, the Moshe Shilo Center for Marine Biogeochemistry, and the staff of the Interuniversity Institute for funding and logistic support. F.L.F. and B.M. thank the financial support of Ministry of Science and Technology of Spain (Projects AGL2005-02655, CGL2008-05407-C03-01 and CGL2007-66095/BOS). This research was supported by Research Grant Award No IS- 3853-06 from BARD , The United States-Israel Binational Agricultural Research and Development Fund to A.I. We are grateful to the help of the students T. Psor, U. Arazi, S. Frenk and S. Ukabi.

Keywords

  • Fishpond effluent
  • Gracilaria conferta
  • Mycosporine-like amino acids
  • Nutrients
  • Tank culture
  • Ultraviolet radiation

ASJC Scopus subject areas

  • Pollution
  • Aquatic Science
  • Oceanography

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