Abstract
Abstract Antigenic reactions of different phycoerythrins to monoclonal anti-R-phycoerythrin were compared using elisa in order to elucidate possible immunological differences between species. The survey included 55 species of Rhodophyta in 24 families and nine orders. Antigenic responses indicated intrageneric protein homogeneity in Porphyra, Gracilarial Gracilariopsis, Grateloupia and Polysiphonia. Heterogeneity was shown in Audouinella, Griffithsia and Laurencia. A wide range of reactions occurred within several orders, suggesting that phycoerythrin may not be as conserved as is presently believed. The antigenic response to anti-R-PE is of significance in suggesting polyphyly, in demonstrating divergence of the protein both intra- and inter-ordinally, and in distinguishing taxa at specific and possibly generic levels.
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