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Photosynthetic gene expression responses of the oceanic ubiquitous cyanobacterium Prochlorococcus due to changes of environmental variables

AuthorsFernández-Pinos, María-Carmen; Piña, Benjamín; Vila-Costa, Maria ; Agustí, Susana ; Vaqué, Dolors ; Duarte, Carlos M. ; Estrada, Marta ; Simó, Rafel ; Sobrino, Cristina; Dachs, Jordi
Issue Date24-Feb-2015
PublisherAssociation for the Sciences of Limnology and Oceanography
Citation2015 Aquatic Sciences Meeting. Program Book: 81 (2015)
AbstractThe cyanobacterium Prochlorococcus is the smallest and most abundant photosynthetic organism on Earth [1]. Being a main global primary producer and ubiquist in the tropical and subtropical regions of the world’s oceans [2], it constitutes a good sentinel species for evaluating the effect of environmental stressors on oceanic photosynthesis. We developed a sensitive method to monitor the expression of two genes responsible of photosynthesis in Prochlorococcus, rbcL (RuBisCO) and psbA (D1 protein), using rnpB as reference gene [3,4]. We applied the method to samples from 63 stations of the Malaspina circumnavigation cruise (December 2010 - July 2011), sampled at three depths. In addition, natural communities of nano-and picoplankton were experimentally exposed to organic pollutant mixtures. Expression of Prochlorococcus rbcL and psbA genes correlated with several physical variables and other biological measurements, and were sensitive to low levels of organic pollutant mixtures. We consider these sublethal effects on the photosynthesis, together with already known effects at cellular level [5,6], are significant potential perturbators of the oceanic carbon cycle. This confirms the anthropogenic chemosphere as a vector of global change during the Anthropocene. 1. Bryant DA 2003 Proc Natl Acad Sci USA 100:9647-9649 2. Partensky F et al. 1999 Microbiol Mol Biol Rev 63:106-127 3. Martiny AC et al. 2006 Proc Natl Acad Sci USA 103:12552-12557 4. Gomez-Baena G et al 2009 Res Microbiol 160:567-575 5. Echeveste P et al. 2010 Chemosphere 81:161-168 6. Echeveste P et al. 2011 Environ Pollut 159:1307-1316
DescriptionAquatic Sciences Meeting, Aquatic Sciences: Global And Regional Perspectives - North Meets South, 22-27 February 2015, Granada, Spain
Publisher version (URL)http://www.sgmeet.com/aslo/granada2015/program.asp
Appears in Collections:(IMEDEA) Comunicaciones congresos
(ICM) Comunicaciones congresos
(IDAEA) Comunicaciones congresos
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