Abstract
ABSTRACT The success of breeding programs depends on genetic variability. Individuals selected based on a few traits may be a limitation. One alternative is the use of nonparametric indices. However, there is no information on the use of selection indices in melon germplasms. The present study aimed to estimate genetic dissimilarity in a melon germplasm and select potential parent plants for future breeding programs. The genetic material consisted of 37 melon accessions. The traits assessed were fruit diameter and length, diameter and length of the fruit cavity and total soluble solids. Genetic dissimilarity was assessed by multivariate analyses (UPGMA and Tocher). Selection gain estimates were analyzed by comparing the classic Smith-Hazel and sum of ranks indices. Genetic diversity was observed between accessions. The variable that contributed most to genetic dissimilarity was fruit cavity length. Simultaneous selection for the traits assessed based on the sum of ranks index is better suited to melon germplasm assessment. The best accessions for the five variables simultaneously were UFU07, UFU23, UFU09, UFU21, UFU28 and UFU30.
Highlights
O sucesso dos programas de melhoramento depende da variabilidade genética
The success of breeding programs depends on genetic variability, which is maximized by interbreeding contrasting genotypes, associated with the selection of morphological and physiological traits of interest
Several multivariate techniques can be applied to quantify genetic dissimilarity, including principal component analysis (PCA), canonic variables, hierarchical clustering and optimization methods
Summary
O sucesso dos programas de melhoramento depende da variabilidade genética. Indivíduos selecionados com base em poucas características pode ser uma limitação. Não há informações sobre uso de índices de seleção em germoplasmas de melão. Nesse estudo objetivou-se estimar a dissimilaridade genética em um germoplasma de melão e selecionar potenciais genitores para fomentar futuros programas de melhoramento genético. A seleção simultânea para os caracteres com base no índice da soma de ranks foi mais adequada para avaliação do germoplasma de melão. The success of breeding programs depends on genetic variability, which is maximized by interbreeding contrasting genotypes, associated with the selection of morphological and physiological traits of interest. The choice of the most adequate index depends on the crop and desired traits (Smiderle et al, 2019); there is no information on the use of selection indices in melon germplasms
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
