[en] We present the results of a multiple organizational level analysis conceived to identify acclimative/ adaptive strategies exhibited by the seagrass Posidonia oceanica to the daily uctuations in the
light environment, at contrasting depths. We assessed changes in photophysiological parameters,
leaf respiration, pigments, and protein and mRNA expression levels. The results show that the diel oscillations of P. oceanica photophysiological and respiratory responses were related to transcripts and proteins expression of the genes involved in those processes and that there was a response asynchrony between shallow and deep plants probably caused by the strong di erences in the light environment. The photochemical pathway of energy use was more e ective in shallow plants due to higher light availability, but these plants needed more investment in photoprotection and photorepair, requiring higher translation and protein synthesis than deep plants. The genetic di erentiation between
deep and shallow stands suggests the existence of locally adapted genotypes to contrasting light environments. The depth-speci c diel rhythms of photosynthetic and respiratory processes, from molecular to physiological levels, must be considered in the management and conservation of these key coastal ecosystems.
Centre/Unité de recherche :
Stareso
Disciplines :
Sciences aquatiques & océanologie
Auteur, co-auteur :
Procaccini, Gabriele; Stazione Zoologica Anton Dohrn, Naples, Italy
Ruocco, Miriam; Stazione Zoologica Anton Dohrn, Naples, Italy
Marin-Guirao, Lazaro; Stazione Zoologica Anton Dohrn, Naples, Italy
Dattolo, Emanuela; Stazione Zoologica Anton Dohrn, Naples, Italy
Brunet, Christophe; Stazione Zoologica Anton Dohrn, Naples, Italy
Esposito, Daniela; Stazione Zoologica Anton Dohrn, Naples, Italy
lauritano, Chiara; Stazione Zoologica Anton Dohrn, Naples, Italy
Mazzuca, Silvia; Universitá della Calabria, Rende, Italy
Serra, Illia Anna; Universitá della Calabria, Rende, Italy
Bernardo, Letizia; Universitá della Calabria, Rende, Italy
Piro, Amalia; Universitá della Calabria, Rende, Italy
Beer, Sven; Tel Aviv University, Tel Aviv, Israel.
Bjork, Mats; Stockholm University, Stockholm, Sweden
Gullstrom, Martin; Stockholm University, Stockholm, Sweden
Buapet, Pimchanok; Stockholm University, Stockholm, Sweden
Rasmusson, Lina; Stockholm University, Stockholm, Sweden
Feliberto, Paulo; LARSyS, University of Algarve, Faro, Portugal
Gobert, Sylvie ; Université de Liège > Département de Biologie, Ecologie et Evolution > Océanographie biologique
Runcie, John; University of Sydney, Sydney, Australia.
Silva, Joao; CCMAR, University of Algarve, Faro, Portugal
Olive, Irene; CCMAR, University of Algarve, Faro, Portugal
Costa, Monya; CCMAR, University of Algarve, Faro, Portugal
Barrote, Isabel; CCMAR, University of Algarve, Faro, Portugal
Santos, Rui; CCMAR, University of Algarve, Faro, Portugal
COST - European Cooperation in Science and Technology MIUR - Ministero dell'Istruzione, dell'Università e della Ricerca FCT - Foundation for Science and Technology
Subventionnement (détails) :
Acknowledgements
We thank the ESF COST Action (ES0906) Seagrass Productivity: From Genes to Ecosystem Management for the funds provided and all the participants to the October 2011 WG1 and WG2 Workshop: linking seagrass productivity, community metabolism, and ecosystem carbon fluxes, for their fruitful discussions. We also thank the MIUR Italian Flagship project RITMARE and the Marie Curie project HeatGrass (EU, FP7-PEOPLE2013-IEF). The study received Portuguese funds from FCT - Foundation for Science and Technology through project UID/Multi/04326/2013. This paper is the MARE publication number 352. D.D’E. and M.R. were supported by a SZN PhD fellowship via the Open University.
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