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
GENETIC DIVERSITY OF MARINE SYNECHOCOCCUS ISOLATES FROM THE CALIFORNIA
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