Abstract

VAZQUEZ CALDERON, Mariela et al. Validation of the use of molecular markers of sex and color in hybrids derived from crosses of Maradol x creole papaya. Rev. Mex. Cienc. Agríc [online]. 2016, vol.7, n.4, pp.767-780. ISSN 2007-0934.

The shape, size and color of fruit pulp are aspects that determine consumer acceptance and priority in the breeding papaya. The objective was to validate the use of molecular markers to select genotypes in terms of sexual type, color and size of the fruit. Genotypes (F1 and F2) derived from intraspecific crosses L7xM22 were characterized molecularly in juvenile stage. To 6 to 9 months compared to classification based on morphological characters. The CPM1815Y52 marker (sexual) was used, the marker CPFC1 (flesh color) as well as eight QTLs associated with fruit size. The CPM1815YC2 marker identified hermaphrodite and female plants in a 2: 1, 100% of F1 and F2 genotypes. With the score CPFC1 identified in the F1 population, 53.57% had orange yellow flesh and 46.43% orange-red pulp. In the F2, the homozygous recessive allele orange-reddish color introgression in 98.1%, 92.6% and 100% over H90B, H70B and H77B. The molecular prediction of floral type and color of pulp, checking phenotypically seedling stage 3 and 7 months before the presence of flowers and fruits is very useful in breeding programs assisted by markers, no QTL studied was able to predict the size or shape of fruit; further research is needed to develop better related to the size and shape of fruits of papaya hybrid between Maradol x creole materials QTLs (or other molecular markers).

Keywords : Carica papaya L.; fruit morphology; molecular markers.

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