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Loss of Pollen-S Function in Two Self-Compatible Selections of Prunus avium Is Associated with Deletion/Mutation of an S Haplotype–Specific F-Box Gene

^a Plant Science Division, School of Biosciences, University of Nottingham, Loughborough LE12 5RD, United Kingdom
^b East Malling Research, East Malling, Kent ME19 6BJ, United Kingdom

¹ To whom correspondence should be addressed. E-mail tim.robbins{at}nottingham.ac.uk; fax 44-115-951-6334.

Recently, an S haplotype–specific F-box (SFB) gene has been proposed as a candidate for the pollen-S specificity gene of RNase-mediated gametophytic self-incompatibility in Prunus (Rosaceae). We have examined two pollen-part mutant haplotypes of sweet cherry (Prunus avium). Both were found to retain the S-RNase, which determines stylar specificity, but one (S₃' in JI 2434) has a deletion including the haplotype-specific SFB gene, and the other (S₄' in JI 2420) has a frame-shift mutation of the haplotype-specific SFB gene, causing amino acid substitutions and premature termination of the protein. The loss or significant alteration of this highly polymorphic gene and the concomitant loss of pollen self-incompatibility function provides compelling evidence that the SFB gene encodes the pollen specificity component of self-incompatibility in Prunus. These loss-of-function mutations are inconsistent with SFB being the inactivator of non-self S-RNases and indicate the presence of a general inactivation mechanism, with SFB conferring specificity by protecting self S-RNases from inactivation.

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