Development of superior lines of papaya from the Formosa group using the pedigree method and REML/Blup procedure

Abstract

Developing superior lines based on a simultaneous response from many traits of agronomic importance is a fundamental strategy to expand papaya cultivar supply, mainly the much-needed cultivars belonging to group Formosa. Our goal was to associate the pedigree method with REML/Blup procedure to select plants of progenies F 2:3 with superior agronomic performance. The variance components and genetic parameters were estimated using REML approach, and the genetic values were predicted using Blup methodology. The combined selection was performed using the IG2 selection index based on weights associated with agronomic values to indicate the best progenies and lines. The heritability estimates of progeny mean were high in most traits and evidenced significant genetic variability between progenies. The narrow-sense individual heritability was moderate in traits such as commercial fruits and soluble solid contents, which indicates a PLANT BREEDING -Article favorable condition for selections within progenies. The index was consistent in the selection of six superior progenies according to the assessed traits. This index also enabled promising genetic gains in traits of great interest such as yield and pulp thickness.Although the progenies are derived from self generations, they proved to be superior in traits of significant importance such as yield, commercial fruits, and pulp thickness when compared to the Tainung-01 hybrid, which is a worldwide-planted cultivar used as a reference to Formosa representatives. Six lines were selected within the superior progenies to continue the Formosa group-lines development program. The association of the pedigree method with REML/Blup procedure can be useful to assist breeders in an autogamous breeding program.

Discovery of SNPs and InDels in papaya genotypes and its potential for marker assisted selection of fruit quality traits

“…The Sekati line (originally from Malaysia) produces large fruits with excellent fruit firmness and moderate total soluble solid content. The JS-12 line (originally from the Embrapa—National Cassava & Fruits Research Center (CNPMF) of Brazil), on the other hand, presents high total soluble solid content and moderate fruit size and firmness 29 , 44 .…”

Combining ability of recombined F4 papaya lines: a strategy to select hybrid combination

“…The UC-Sekati parent has large fruits, optimum pulp firmness, and medium soluble solids content. The UC-JS12 parent, in turn, diverges from UC-Sekati in relation to the last two traits, exhibiting moderate pulp firmness and elevated soluble solids content (Cortes et al, 2019). Accordingly, the UC-Sekati parent was used as a source of pulp thickness, whereas UC-JS12 was used as a source of flavor.…”

Use of an index based on best linear unbiased prediction value for the selection of superior papaya lines for multiple traits

“…The most popular varieties in commercial production fields worldwide are from the 'Solo' group because of their fruits with desirable characteristics for export activities, with small size and weight between 300 and 650 g. On the other hand, hybrids of the 'Formosa' group presenting larger fruits, with an average weight between 1,000 and 1,300 g, have been gaining space in the Brazilian market and importing countries in Europe and North America (Barbieri et al 2019;Oliveira and Vitória 2011). However, few hybrids of the 'Formosa' group are available for the larger fruit market, and there is still a strong dependence on hybrid seeds imported from Taiwan for the production of these fruits (Cortes et al 2019).…”