Abstract
ABSTRACT The development of common bean cultivars that contain satisfactory minerals and phytate concentrations for the different nutritional requirements of consumers is a new strategy of breeding programs. This work aimed to obtain estimates of genetic parameters for the concentrations of phosphorus, phytate, iron, and zinc in a recombinant inbred line (RIL) population of Mesoamerican common bean, to study the correlations between these traits, and to select common bean lines for the biofortification program and for diets that require the decrease in the intake of these minerals. The RIL were obtained from the cross between BRS Esteio and SCS 205 Riqueza. Genetic variability and transgressive segregation were detected for all traits evaluated. Heritability estimates for the concentrations of phosphorus, phytate, iron, and zinc ranged from intermediate (h2: 30.31%) to high (h2: 98.68%) magnitude, and quantitative inheritance was observed. The phosphorus concentration showed an intermediate correlation estimate with iron (r = 0.4157) and zinc (r = 0.5693) concentrations. Cultivar BRS Expedito and line L 56-17 have a low phytate concentration (≤ 1.29%) and a high iron concentration (≥ 95 mg kg-1 of dry matter - DM), and will be selected by the common bean biofortification program. Lines L 59-17, L 31-17, and L 26-17 and cultivars IPR Siriri and BRS Valente have a high phytate concentration (≥ 2.57%) and a low zinc concentration (≤ 26 mg kg-1 DM) and will be selected for diets that aim at using the beneficial properties of phytate and reducing the zinc intake.
Highlights
Common bean (Phaseolus vulgaris L.) is a staple food in several countries and is found in local recipes that use fresh or dried grains
This work aimed to estimate genetic parameters for the concentrations of phosphorus, phytate, iron, and zinc in a recombinant inbred line population of Mesoamerican common bean, to study the correlations between these traits, and to select common bean lines for the biofortification program and for diets that require the decrease in the intake of these minerals
Mesoamerican common bean lines with great variation for the concentrations of phosphorus and zinc (Maziero; Ribeiro; Facco, 2016), phosphorus and phytate (Blair et al, 2009a, 2012), and iron and zinc (Blair et al, 2009b, 2010) were previously obtained from crosses between contrasting parents for these traits. These results show the possibility of developing common bean cultivars with concentrations of phosphorus, phytate, iron, and zinc that meet the different nutritional requirements of consumers
Summary
Common bean (Phaseolus vulgaris L.) is a staple food in several countries and is found in local recipes that use fresh or dried grains. The mineral concentrations in common bean cultivars has been described in the literature as having a wide genetic variability (Akond et al, 2011; Hossain et al, 2013; Ribeiro et al, 2013a; Martins et al, 2016). This fact has enabled the development of common bean lines with high concentrations of phosphorus (Blair et al, 2009a, 2012; Maziero; Ribeiro; Facco, 2016), iron (Blair et al, 2009b, 2010; Jost et al, 2013; Ribeiro et al, 2013a,b; Martins et al, 2016), and zinc (Blair et al, 2009b, 2010; Ribeiro et al, 2013a; Martins et al, 2016; Maziero; Ribeiro; Facco, 2016). Lowering the phytate concentration is imperative for the common bean biofortification
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