Selection and estimation of the genetic gain in segregating generations of papaya
Francisco Filho da Silva, Messias Gonzaga Pereira, Helaine Christine Cancela Ramos, Pedro Corrêa Damasceno Junior, Telma Nair Santana Pereira, Ana Paula Cândido Gabriel, Alexandre Pio Viana and Geraldo Antônio Ferreguetti
Abstract: In Brazil, papaya is sustained by a narrow genetic basis, with few genetically distinct cultivars for planting. Therefore, this study aimed to select and estimate the direct and combined genetic gains for commercial fruit yield (Yld Plt!) in segregating generations of papaya. Six traits were simultaneously targeted in combined selection and were attributed weights associated to agronomic values. Direct selection however was based on Yid Plt! only. Results indicated genetic variability in the segregating generations for the evaluated traits and although combined selection achieved a lower genetic gain in Yld Plt”, it offers greater chances of success in the following generations since favorable and unfavorable agronomic traits of papaya are considered. These results motivated the recommendation to advance gen erations with 30 plants, selected from a total of 345 plants, considering all segregating treatments.