Selection and estimation of the genetic gain in segregating generations of papaya (Carica papaya L.)

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-1)in segregating generations of papaya. Six traits were simultaneously targeted in combined selection and were attributedweights associated to agronomic values. Direct selection however was based on Yld Plt-1 only. Results indicated geneticvariability in the segregating generations for the evaluated traits and although combined selection achieved a lower geneticgain in Yld Plt-1, it offers greater chances of success in the following generations since favorable and unfavorable agronomictraits of papaya are considered. These results motivated the recommendation to advance generations with 30 plants, selectedfrom a total of 345 plants, considering all segregating treatments.

Keywords

• Papaya
• fruit yield
• selection gain
• carpelloidy
• female sterility.