Abstract
Nine different F2 families of peach [Prunus persica (L.) Batsch] were analyzed for linkage relationships between 14 morphological and two isozyme loci. Linkage was detected between weeping (We) and white flower (W), 33 cM; double flower (Dl) and pillar (Br), 10 cM; and flesh color (Y) and malate dehydrogenase (Mdh1), 26 cM. A leaf variant phenotypically distinct from the previously reported wavy-leaf (Wa) mutant in peach was found in progeny of ‘Davie II’. The new willow-leaf character (designated Wa2) was closely linked (0.4 cM) to a new dwarf phenotype (designated Dw3). Two families derived from the pollen-fertile cultivar ‘White Glory’ segregated for pollen sterility, but segregation did not follow a 3∶1 ratio. Evidence is presented suggesting that ‘White Glory’ possesses a pollen-sterility gene (designated Ps2) that is non-allelic to the previously reported pollen-sterility gene (Ps) in peach. Ps2 was linked to both weeping (We-Ps2, 15.5 cM) and white flower (Ps2-W, 25.3 cM). A genomic map of peach containing 83 RAPD, one isozyme, and four morphological markers was generated using an F2 family obtained by selfing an NC174RL x ‘Pillar’ F1. A total of 83 RAPD markers were assigned to 15 linkage groups. Various RAPD markers were linked to morphological traits. Bulked segregant analysis was used to identify RAPD markers flanking the red-leaf (Gr) and Mdh1 loci in the NC174RL x ‘Pillar’ and ‘Marsun’ x ‘White Glory’ F2 families, respectively. Three markers flanking Mdh1 and ten markers flanking Gr were identified. The combination of RAPD markers and bulked segregant analysis provides an efficient method of identifying markers flanking traits of interest. Markers linked to traits that can only be scored late in development are potentially useful for marker-aided selection in trees. Alternatives for obtaining additional map order information for repulsion-phase markers in large F2 populations are proposed.
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Communicated by H. K. Dooner
This work was supported in part by the McKnight Foundation, North Carolina Biotechnology Center, North Carolina State University Forest Biotechnology Research Consortium, and the North Carolina Agricultural Research Service, Raleigh, North Carolina
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Chaparro, J.X., Werner, D.J., O'Malley, D. et al. Targeted mapping and linkage analysis of morphological isozyme, and RAPD markers in peach. Theoret. Appl. Genetics 87, 805–815 (1994). https://doi.org/10.1007/BF00221132
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DOI: https://doi.org/10.1007/BF00221132