Morphological and DNA markers for Carica papaya L. x Carica quercifolia St. Hil. interspecific hybrid
2003
Garces, A.C.M. | Magdalita, P. | Brar, D.S. | Villegas, V.N. (Philippine Council for Agriculture, Forestry and Natural Resources Research and Development, Los Banos, Laguna (Philippines))
Papaya ringspot virus (PRSV) is the most damaging disease of papaya worldwide. The development of genetically resistant varieties offers long term solution to the disease problem. The wild relatives of papaya are potential gene reservoir for PRSV resistance/tolerance confirmed from C. quercifolia, C. stipulata, C. pubescens, C. candicans, and C. cauliflora. Earlier attempts for introgression of PRSV resistance gene from the wild Carica were not successful due to the reproductive isolation of C. papaya from other Carica species. Cross compatibility of papaya with its wild relative is an important prerequisite for the introgression of any desired characters from the wild species to the cultivated papaya. Many successful interspecific crosses had been obtained and one of them is C. papaya x C. querx78cifolia. This putative hybrid, produced through embryo rescue, needs to be assessed to confirm its genetic hybridity. Several morphological markers and a DNA hybridization technique have been used to confirm the genetic identity of the interspecific hybrid plants. Useful morphological markers that are intermediate of the two parents include: the number of main leaf veins, hermaphrodite flowers and numerous (17 to 24) flowers per cluster of the F1 hybrid. Total genomic DNA hybridization profiles indicated partial divergence of the cultivated species from its wild relative and can be used to confirm hybridity
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