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Corinto bianco: A Seedless Mutant of Pedro Ximenes

¹ IMIDRA, Finca El Encín, Carretera A-2, PK 38,200, 28800 Alcalá de Henares, Spain; and ² UMR DiaPC, Equipe Vigne INRA-Montpellier SupAgro Bat 21, 2 place Viala, 34060 Montpellier cedex, France. The first two authors contributed equally to this paper.

^* Corresponding author (email: javier.ibanez{at}madrid.org; fax: +34 918 879 492)

The cultivated variety Pedro Ximenes is a seeded winegrape and Corinto bianco is a parthenocarpic seedless variety maintained in collection. To date, the two varieties have not been considered as related. In this study, identical DNA profiles were observed in both varieties for 25 microsatellite loci. Among morphological characteristics, they only differed in the presence or absence of seeds and in seed-related characteristics such as berry size, cluster density, and cluster size. These results suggest that both varieties arose from the same original embryo and one is a mutation of the other. Parentage analysis revealed the cultivar Gibi as a probable parent of Pedro Ximenes.

Key words: microsatellites, morphology, somatic mutation, seedlessness