ISHS Acta Horticulturae 694: International Symposium on Harnessing the Potential of Horticulture in the Asian-Pacific Region
CROSS COMPATIBILITY OF ELITE PAPAYA INBRED LINES TO AN INTERGENERIC HYBRID OF CARICA PAPAYA × VASCONCELLA QUERCIFOLIA |
| Authors: | A.G.C. Sajise, S.V. Siar, J.B. Sangalang |
| Keywords: | symptomless, culturable embryos, plantlets, parthenocarpy |
| Abstract:
Cross compatibility of four papaya inbred lines to an F1 intergeneric hybrid, C. papaya x V. quercifolia ‘Line 410’ was studied. Parental lines used were characterized morphologically. Resistance to papaya ringspot virus type P (PRSV-P) and pollen viability of ‘Line 410’ was evaluated under local conditions. The genotypic compatibility among four crosses between the F1 intergeneric hybrid and papaya inbred lines (4108, 4172, 5648, and 5893) was evident. Crosses to inbreds 5648 and 5893 produced fruits filled with many non-viable seeds while 4108 and 4172 produced few seeds but had embryos that grew in vitro. Large differences were observed in morphological characters between papaya inbred lines as well as between papaya and F1 intergeneric hybrid ‘Line 410’. Cluster analysis divided parent materials into three groups. Papaya inbred lines derived from local selections (4108 and 4172) and inbred lines that were introduced from other countries (5648 and 5893) were on separate clusters. ‘Line 410’ has a separate cluster of its own. Symptomatology and serological tests by indirect ELISA (Enzyme Linked Immunosorbent Assay) confirmed that intergeneric hybrid ‘Line 410’ plants had resistance against PRSV-P. A pollen viability assay using tetrazolium showed ‘Line 410’ plants had some viable pollen under local conditions. | |
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