ibclogo XVI International Botanical Congess

Abstract Number: 2974
Poster No. = 1958


PROCHLOROPHYTE(CYANOBACTERIAL)CHL a/b PROTEINS ARE NOT RELATED TO CHLOROPLAST CHL a/b PROTEINS AND MAY BE THE RESULT OF INDEPENDENT GENE DUPLICATIONS IN THE THREE PROCHLOROPHYTE LINEAGES


B.R.Green, K.-I. Ishida, N. Yurkova, G.W.M. v.d. Staay, Botany & Microbiology Depts., University of B.C., Vancouver, V6T 1Z4, Canada


Prochlorophyte refers to three unrelated genera of cyanobacteria which make Chl b and have Chl a/b light-harvesting antennas. Their Chl a/b (Pcb) proteins are not part of the LHC Superfamily (Chl a/b & Chl a/c antennas of chloroplasts) but part of the Core Complex Family which includes PSII core Chl a proteins (CP47/43), and IsiA, the Fe-stress induced Chl a binding protein of cyanobacteria (PNAS 93:15244-48,1996). Phylogenetic analysis of the three pcb genes of P.hollandica suggests they originated independently from a common ancestor of psbC (CP43) and isiA (Plant.Mol.Biol. 38:709-716,1998). Their evolutionary history does not parallel the evolution of Chl b synthesis.

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