Analysis of molecular mechanism, origin and diversity of gametophytic self-incompatibility systems

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Analysis of candidates for pollen-determinant in Japanese pear and apple of Rosaceae suggested that multiple and related F-box genes, SFBB, are collaboratively detoxify non-self pistil determinant, S-RNase. Isolation and functional analysis of HT-B gene, a non-S-specific self-incompatibility factor, of petunia showed that, unlike other solanaceous species, even a dramatic suppression of HT-B transcript resulted in partial breakdown of self-incompatibility in petunia. This may suggest slight functional divergence of HT-B gene in different species of Solanaceae.