Tissue-specific antigens secreted by suspension-cultured callus cells of Prunus avium L.

A number of antigenic components are secreted into the medium by P. avium callus cells derived from different tissues and grown in suspension culture. These antigens have been detected using antiserum raised in rabbits to a protein fraction secreted by P. avium leaf callus. One antigen is specific to leaf tissue and is secreted by callus cells derived from stem, pistil and anthers as well as leaves. A second antigen is, in intact organs, restricted to styles of a particular self-incompatibility (S) genotype, but is also secreted by callus cells derived from the leaf. Another antigen, apparently not organ-specific, is secreted by all calli tested, including Rosa (cv. Paul's Scarlet).