Summary
Genetic and molecular analysis of the self-incompatibility locus (S-locus) of the crucifer Brassica has led to the characterization of a multigene family involved in pollen-stigma interactions. While the crucifer Arabidopsis thaliana does not have a self-incompatibility system, S-related sequences were detected in this species by cross-hybridization with Brassica DNA probes. In this paper, we show that an A. thaliana S-related sequence, designated AtS1, is expressed specifically in flower buds. Sequence analysis suggests that AtS1 encodes a secreted glycoprotein that is most similar to the Brassica S-locus related protein SLR1. As has been proposed for SLR1, this gene may be involved in determining some fundamental aspect of pollen-stigma interactions during pollination. The molecular and genetic advantages of the Arabidopsis system will provide many avenues for testing this hypothesis.
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Communicated by H. Saedler
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Dwyer, K.G., Lalonde, B.A., Nasrallah, J.B. et al. Structure and expression of AtS1, an Arabidopsis thaliana gene homologous to the S-locus related genes of Brassica . Molec. Gen. Genet. 231, 442–448 (1992). https://doi.org/10.1007/BF00292714
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DOI: https://doi.org/10.1007/BF00292714