Cross compatibility of elite papaya inbred lines to an interspecific hybrid of Carica papaya L. x Carica quercifolia (Saint-Hil.) Hieron
2004
Sajise, A.G.C. | Siar, S.V.,Philippines Univ. Los Banos, College, Laguna (Philippines). Inst. of Plant Breeding | Sangalang, J.B.
Cross compatibility of four papaya inbred lines to F1 interspecific hybrid, Carica papaya x C. querifolia line 410 was studied. Parental lines used were characterized morphologically. In addition, resistance to papaya ringspot virus (PRSV-P) and pollen viability of line 410 was evaluated under Philippine conditions. The genotypic compatibility among four crosses between F1 interspecific hybrid and papaya inbreds (4108, 4172, 5648 and 5893) are evident. Crosses differ in the number of pollinated fruits that has seeds and the average number of seeds produced per fruit. All crosses produced viable embryos that grow easily in vitro. Remarkable difference was observed in morphological characters among papaya inbreds as well as between papaya and F1 interspecific hybrid line 410. Cluster analysis separated parent materials into three subgroups. Papaya inbreds derived from local selections (4108 and 4172) and inbreds that were introduced from other countries (5648 and 5893) were subdivided. Line 410 has a separate cluster. Symptomatology and serological test by indirect ELISA (Enzyme Linked Immunosorbent Assay) confirmed that line 410 plants have resistance against PRSV-P. Tetrazolium test, a pollen viability assay showed line 410 plants have some number of viable pollen under local conditions.
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