Abstract
ABSTRACT Production of purple-fleshed sweetpotatoes, source of anthocyanins, pigments with high antioxidant activities, is expected to be extended during the upcoming years, as there is a strong trend to market products promising improved health. This study aimed to evaluate yield, postharvest quality and pest resistance of roots of purple-fleshed sweetpotatoes. Six genotypes (BGBD 0005, BGBD 0080, BGBD 1261, BGBD 1399, BGBD 1402 and BGBD 1405) and the cultivars Beauregard and Brazlândia Roxa as controls were evaluated during two seasons 2018 (Experiment 1) and 2019 (Experiment 2), in Brasília-DF, Brazil. The experiments were conducted in a complete randomized blocks design with four replications, with experimental plots consisting of two rows of six plants. Roots were harvested about 140 days after planting and evaluated for yield, appearance, insect damage and quality characteristics as soluble solids, dry matter and color. All genotypes showed roots with good resistance to soil insects. The highest commercial production of genotypes BGBD 1261, BGBD 0005, and BGBD 1405 associated to quality traits (dry matter content and soluble solids) and pest resistance, showed their potential for being released as cultivars or to be used in breeding programs.
Highlights
Avaliação de genótipos de batata-doce de polpa roxa para produtividade de raízes, qualidade e resistência a insetos
Purple-fleshed roots are rich in anthocyanins, a phenolic compound associated to reduction of the risk for a variety of degenerative diseases, due to its antioxidant activity (Reyes et al, 2005)
In Brazil, from the 29 sweetpotato cultivars registered in the RNC (National Cultivars Register), SCS370 Luiza is the only one with purple-flesh color (BRASIL, 2020), with restricted recommendation to Santa Catarina state and reported average yield of 14.7 t ha-1 (Schallenberger et al, 2017)
Summary
Avaliação de genótipos de batata-doce de polpa roxa para produtividade de raízes, qualidade e resistência a insetos. A considerable genetic diversity of this species is observed in Brazil, originated by segregation and as a consequence of the introduction of plants from different places. This variability is evident for the flesh colors, ranging from white, light yellow, yellow, orange, to purple (Ritschel & Huamán, 2002; Silva et al, 2012; Carmona et al, 2015; Vargas et al, 2018). In Brazil, from the 29 sweetpotato cultivars registered in the RNC (National Cultivars Register), SCS370 Luiza is the only one with purple-flesh color (BRASIL, 2020), with restricted recommendation to Santa Catarina state and reported average yield of 14.7 t ha-1 (Schallenberger et al, 2017)
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