Utilization of genetic resources for the introduction and adaptation of exotic vegetable crops: The case of pepino (Solanum muricatum) |
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| Authors: | Jaime Prohens Adrián Rodríguez-Burruezo Fernando Nuez |
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| Institution: | (1) Instituto para la Conservación y Mejora de la Agrodiversidad Valenciana, Universidad Politécnica de Valencia, Camino de Vera 14, 46022 Valencia, Spain;(2) Instituto Valenciano de Investigaciones Agrarias, Carretera Moncada-Náquera, 46113 Moncada, Spain |
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| Abstract: | Summary Pepino (Solanum muricatum), a vegetatively propagated plant from the Andean region used for its edible fruits, has been identified as a potential crop
for greenhouse cultivation in Mediterranean regions. However, attempts for introducing it have been unsuccessful, either because
of the low yield, poor fruit quality, or both. Screening of germplasm under Mediterranean conditions showed that sources of
variation for high yield existed in the cultivated genepool and that wild species S. caripense and S. tabanoense could contribute to a considerable improvement of soluble solids content (SSC) of pepino. Progenies obtained after crossing
genetically distant (AFLP-based) parental clones were heterotic for yield, and allowed the selection of clones with an improved
combination of yield and SSC. As a result of this intraspecific programme, two new improved cultivars (‘Turia’ and ‘Valencia’),
which outperform the rest of cultivars available, have been selected for cultivation in Mediterranean conditions. The interspecific
programme involved the selection of clones with high yield and SSC in backcross generations. The results show that introgression
of genes from the wild species can contribute to improve the SSC of pepino. The backcross programme is in an advanced stage
and new cultivars derived from the interspecific crosses are expected to be released in a near future. New prospects for the
future in pepino breeding include the genetic transformation, the establishment of a genetic map, and the use of the genomic
information from related Solanaceae important crops. All the information obtained is illustrative for the breeding for adaptation
of vegetatively propagated crops. |
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| Keywords: | adaptation fruit quality heterosis source of variation wild relatives yield |
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