Se-haplotype confers self-compatibility in Japanese plum (Prunus salicinaLindl.)

SummaryInvolvement of the Se-haplotype in self-compatibility in the Japanese plum cultivars ‘Santa Rosa’ (ScSe) and ‘Beauty’ (ScSe), was investigated. Self-pollination and pollen-tube growth tests confirmed that cv. ‘Rio’, which also has a Se-haplotype (SaSe), is self-compatible. In self- and cross-pollination experiments between cultivars with the ScSe haplotype, the resultant progenies segregated into two S-haplotypes, ScSe and SeSe, suggesting that only the Se-haplotype was inherited in progeny from the male parent. These results indicated that the Se-haplotype is responsible for self-compatibility. Expression analyses of S-RNase showed that the Se-RNase gene was transcribed in the style. Therefore, it appeared that inhibition of transcription of the S-RNase gene is not responsible for the self-compatibility in the Se-haplotype of Japanese plum.