Genetic parameters and estimated breeding values of blackberry parents under a warm environment

Abstract

In blackberry, the identification of the best plants is usually based on the phenotypic value. However, the phenotypic value of complex traits is not always a reliable parameter that allows the maximum genetic gain per cycle of selection. The present study aimed to explore the breeding potential of thirteen blackberry parents based on their breeding values, and estimate genetic parameters of important traits in blackberry breeding. A total of fourteen crosses (sib-full families) were obtained from crossing thirteen blackberry genotypes. According to the mixed model 2, the heritability estimations ranged from 0.14 to 0.93. The highest heritability (h2 > 0.9) was found in days to the first pick and harvest interval, while the lowest one (h2 < 0.2) in berry weight. The genotypes ?Chickasaw?, S3?, ?Choctaw?, ?Tupy?, and ?S5? exhibited simultaneously positive breeding values for yield, and berry weight, whereas ?Natchez?, ?S1?, and ?S6? for earliness and harvest interval. For soluble solids content, ?S6?, ?S3?, and ?Kiowa? had the best breeding values. Based on our results, the germplasm used in the study has additive effects with high commercial value that could be used in the blackberry programs.