The apricot as a source of self-compatibility and Plum pox virus resistance in the generation of interspecific hybrids Prunus salicina Lindl. × Prunus armeniaca L. (plumcots)
The plumcot is an interspecific hybrid between Japanese plum species (Prunus salicina Lindl) and apricot species (Prunus armeniaca L.), which provides a new fruit typology of high agronomic and market potential by combining the characteristics of these two stone fruit species. Within the framework of apricot and Japanese plum breeding programs developed at CEBAS-CSIC in Murcia (Spain), the release of commercial plumcots is one of the proposed objectives. Due to the small number of self-compatible varieties and the lack of resistance to sharka disease (Plum pox virus, PPV) in the Japanese plum species, interspecific crosses between Japanese plums and self-compatible, sharka-resistant apricot (Prunus armeniaca L.) cultivars have been performed during the last years in order to obtain resistant and self-compatible plumcots (interspecific hybrids). An initial screening of more than 650 seedlings was carried out for interspecific hybrid verification using SSR (Simple Sequence Repeat) markers. In addition, floral compatibility by S-allele genotyping and by observing the growth of the pollen tubes in the pistil by fluorescence microscopy, phenotypic characterization and PPV resistance evaluation in controlled conditions were performed in the interspecific genotypes. The obtained results show the release of some interspecific plumcots with the desired characteristics of self-compatibility and resistance to PPV. We are currently in the process of evaluating their agronomic characteristics to develop new self-compatible and PPV resistant plumcot varieties with high-quality fruits.
Nicolás-Almansa, M., Guevara, A., Rubio, M., Cos, J., Carrillo, A., García-Montiel, F., Salazar, J.A., Martínez-Gómez, P. and Ruiz, D. (2020). The apricot as a source of self-compatibility and Plum pox virus resistance in the generation of interspecific hybrids Prunus salicina Lindl. × Prunus armeniaca L. (plumcots). Acta Hortic. 1290, 115-118
plumcot, inheritance, breeding, interspecific hybrids, floral compatibility, sharka resistance, SSRs