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Japanese apricot (Prunus mume Sieb. et Zucc.) exhibits the S-RNase-based gametophytic self-incompatibility (SI) system, which is controlled by a single polymorphic locus called the S locus containing the pistil S (S-RNase) and pollen S genes (SFB/SLF for S haplotype-specific F-box gene/S locus F-box gene). This study was conducted to elucidate the unknown molecular basis of self-compatibility (SC) in a selection line 1K0-26, an offspring of ‘Benisashi’ × ‘Koshinoume’, to explore the possible use of this line for SC breeding in Japanese apricot. Controlled pollination and segregation analyses demonstrated that 1K0-26 has an intact SI S7 haplotype and a pollen-part mutant SC S3′ haplotype. Cloning and DNA sequence analysis of the S3′ locus revealed a 7.1 kb insertion in the pollen determinant SFB3′, which makes a premature stop codon to produce transcripts for truncated dysfunctional SFB, just like the mode of mutation in SFBf, another SC S haplotype in Japanese apricot. The inserted sequence appeared to be a non-autonomous retroposon with long terminal repeats, a part of which is identical to part of the inserted sequence to SFBf. Taking advantage of the similarity of the inserted sequences to the two SC S haplotypes of distinct origin, S3′ and Sf, we have developed a universal PCR marker for the marker-assisted selection for SC in Japanese apricot. We surveyed 86 Japanese apricot cultivars and lines using the PCR marker, and it appeared that 38, 1, and 3 appeared to have only Sf, only S3′, and both Sf and S3′, respectively. Marker-assisted selection for SC in Japanese apricot and the possible use of these cultivars and lines for future SC Japanese apricot breeding programs are discussed.

journal of the japanese society for horticultural science

Characterization of a Novel Self-compatible S3′ Haplotype Leads to the Development of a Universal PCR Marker for Two Distinctly Originated Self-compatible S haplotypes in Japanese Apricot (Prunus mume Sieb. et Zucc.)