Summary
The influence of proteins and RNA from unpollinated, inter-and intraspecifically pollinated styles and from pollen on pollen tube growth in vivo was tested by their application to the stigma prior to pollination. No RNA sample nor proteins from unpollinated styles were effective, whereas pollen tubes were shortened if the S-genotypes of the pollen matched that of the style from which the proteins originated and lengthened if not so. Pollen exudate proteins seemed to have the reversed effect. Active proteins could also be obtained by injection of RNA from pollinated styles into egg cells of Xenopus. Fractionation by means of preparative electrophoresis and isoelectric focusing leaded to two groups of active polypeptides with molecular weights of about 11,000 and 6,000. Application of these polypeptides to the stigma changed the gene expression of the style. Based upon these data a model to explain the recognition part of the incompatibility reaction is proposed.
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Communicated by G. Melchers
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van der Donk, J.A.W.M. Recognition and gene expression during the incompatibility reaction in Petunia hybrida L.. Molec. gen. Genet. 141, 305–316 (1975). https://doi.org/10.1007/BF00331452
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DOI: https://doi.org/10.1007/BF00331452