HIBRIDA??ES CONTROLADAS INTER E INTRAESPECíFICAS PARA O MELHORAMENTO GENéTICO DE PORTA-ENXERTOS DE PEREIRA

摘要

The objective of the study was to characterize the pollen compatibility of pear with quince (interspecific crosses) and between species of pear. It was used: ‘Packham’s Triumph’ (female parental) and ‘William’s’ and ‘Clapp’s Favorite’, ‘Ma??’ and ‘Portugal’ (male parental). It was determined fruit set (%) in the field at 40 days after crosses and the in vivo germination. It was obtained a higher fruit set in the crossing ‘Packham’s Triumph’ x ‘Clapp’s Favorite’. In interspecific crosses, the highest fruit set was obtained with ‘Packham’s Triumph’ x ‘Portugal’’. In in vivo germination, the developmental stage of the pollen tube showed significant variations between the combinations, but the pollen tube did not penetrate the embryo sac. As it was observed fructification in all crossing is possible the existence of compatibility among genotypes. The results indicated that the pollen donor cultivars of the species P. communis are compatible with ‘Packham’s Triumph’. Other studies should be conducted with the pollen of quince to confirm this compatibility.