Toledo, G. G. Scripps Institution of Oceanography, (619) 534 7313
Brahamsha, B. G. Scripps Institution of Oceanography, (619) 534 7313
Palenik, B. B. Scripps Institution of Oceanography, (619) 534 7313

Marine Synechococcus populations contain multiple genetically distinct lineages. The ecological niche of each group, their physiological adaptations and their relative distributions and abundances are still not very well characterized, however. We are addressing these questions by obtaining and characterizing Synechococcus isolates from the California Current. Phylogenetic analysis of the RNA-polymerase rpoC1 gene sequences of strains have revealed four new lineages retrieved into culture. Representative strains from each group are CC9311, CC9605, CC9616, and CC9305-3 (CC9317, CC9318). Additional new isolates cluster with WH8103. Shotgun clone libraries from bulk DNA also show lineages as yet not cultured. The chromophore ratios (PUB/PEB) have been measured by the in vivo absorption at 495/545 nm for strains grown under white light, and compared to reference strains. Multiple strains in the same phylogenetic cluster display typically similar PUB/PEB ratios, but there are striking exceptions suggesting that PUB:PEB ratios can change over relative short evolutionary time scales and similar ratios do not reflect phylogenetic relatedness of strains.
Day: Tuesday, Feb. 2
Time: 10:30 - 10:45am
Location: Hilton of Santa Fe
Code: SS40TU1030H