Genetic parameters and gain from selection in sweet potato genotypes with high beta-carotene content

Abstract

Estimating genetic parameters is an essential procedure to define strategies for breeding and selection of higher yielding genotypes. The use of a selection index can assist in decision making by combining the high yield trait with other desirable traits. The objective of this study was to verify the possibility of gains from selection in a sweet potato population to select potentially promising genotypes. The experiment was conducted in a randomized block design, with three plants per plot and two replications, consisting of 255 sweet potato genotypes and a commercial cultivar (256 treatments). The data were analyzed through REML/BLUP. Genetic gains were evaluated using selection indexes based on the rank sun. The plant population tested showed high genetic variability; 81.25% of the traits had genotypic coefficients of variation above 20%, which indicates conditions favorable to selection with considerable genetic advances. CERAT31-01, CERAT21-02, and CERAT51-30 can be recommended as the most promising genotypes.

Agronomic Characterization of Sweet Potato Genotypes Obtained Through Crossbreeding

“…High heritability is essential for successful selection, allowing breeders to use the most appropriate selection strategies (OTOBONI et al, 2020). Heritability in sweet potatoes is important because dominance and epistatic effects are maintained by vegetative propagation (GONÇALVES NETO et al, 2012).…”

Genotype × environment interaction for the agronomic performance of high β-carotene sweetpotato

“…MY, RDM, and FC were considered the major characteristics of marketable roots, with FC representing the core trait-of-interest in the present study, which aimed at selecting high-yielding and highly adaptive genotypes with a high β-carotene content (indicated by orange flesh color). As this study focuses on household consumption, RDM was selected to meet the preferences of Brazilian consumers', who favor sweetpotatoes with a high dry matter content (Otoboni, Oliveira, Vargas, Pavan, & Andrade, 2020).…”

Sweet Potato (Ipomoea batatas L.) Phenotypes: From Agroindustry to Health Effects

“…A successful breeding program for SP implies a careful selection of germplasms (genetic diversity) and the systematic evaluation of phenotypic traits (ideotypes) sensitive to environmental stressors and crop agronomic performance indicators [ 32 , 33 , 34 ]. It is noteworthy that genetic breeding programs aiming to produce new SP varieties remain challenged since it is an allohexaploid crop [ 5 , 26 , 27 , 28 ] with a large chromosome number (2n = 6x = 90), a complex sporophytic self-and cross-incompatibility and a high degree of genomic duplication [ 35 , 36 ].…”

“…The total/specific content of carotenoids (provitamin A) in SP varies substantially by plant part, varietal (genotype/phenotype), and food processing. In general, SP is recognized as an excellent source of provitamin A (β > α carotenes, 829-43200 IU) [ 20 , 21 , 32 , 60 ]. Orange-fleshed SP (OFSP; Figure 1 ) stands as the best SP source of β-carotene and total carotenoids, and certain varietals, such as Tomlins, Owori, Bechoff, Menya, and Westby varietals rank higher (20–364 µg/g DW) than other recognized β-carotene sources such as carrots (43.5–88.4 µg·g −1 dw) or mango (10.9–12.1 µg·g −1 dw) [ 61 ].…”