Implications of early selection for grain colour on iron and zinc content and productivity of common bean

Abstract

Brazilian consumers prefer beans of the beige grain colour. Common beans help supply dietary requirements for iron and zinc. The objectives of this study were (i) to determine whether early selection for grain colour affects the iron and zinc content and the grain yield in common beans and (ii) if an association between these characteristics was found, to obtain lines of carioca‐type grains with a high iron and zinc content and good grain yield. We evaluated 96 F3:4, F3:5 and F3:6 progeny at two locations for iron and zinc content and grain yield. We selected 48 progeny for grain colour and chose 48 others at random. We found that early selection for grain colour does not affect the zinc content and grain yield. A positive and high association was found between iron and zinc content, and both iron and zinc content were slightly negatively correlated with grain yield. It is possible to obtain common bean lines combining a high iron and zinc content with good grain yield as long as a selection index is used.

<b>Genetic parameters of iron and zinc concentrations in Andean common bean seeds

“…These values are comparable to the broad-sense heritability estimates of iron concentrations in Andean common bean seeds (Possobom et al, 2015) and Middle American common bean seeds (Jost et al, 2009;Teixeira et al, 2015). The narrow-sense heritability estimates varied from 19.04 to 45.29% in the crosses of Ouro Branco × Light Red Kidney and IAC Boreal × Light Red Kidney, respectively, suggesting difficulties in the fixation of this character with the advance of generations.…”

“…A continuous distribution of the iron and zinc concentrations in common bean seeds was previously described in early (Possobom et al, 2015) and advanced (Blair, Astudilo, Grusak, Graham, & Beebe, 2009;Cichy, Caldas, Snapp, & Blair, 2009;Blair et al, 2010b;Ribeiro et al, 2014b;Teixeira, Lima, Abreu, & Ramalho, 2015) generations in recombinants that were obtained from the crosses Andean × Andean, Andean × Middle American and Middle American × Middle American. These results affirm that the iron and zinc concentrations in common bean present quantitative inheritance in populations of low and high homozygosity, regardless of the gene pool, and that they oppose the initial hypothesis of Cichy et al (2005) regarding the monogenic control of the zinc concentration in common bean seeds.…”

Genetic parameters of agronomic and nutritional traits of common bean (Phaseolus vulgaris L.) populations with biofortified grains

“…Iron and zinc deficiencies affect about 40% and 33%, respectively, of the people in the world (The Word Bank, 2006). The potential of beans for biofortification for iron and zinc has been evaluated, and the obtained results are promising (Blair, 2013;Jost et al, 2013;Petry et al, 2015;Teixeira et al, 2015). Biofortification for potassium, phosphorus and copper has not been reported in the literature for beans.…”

“…In this scenario, the biofortification of beans for iron, zinc, potassium, phosphorus and copper is a promising practice to improve human's health. Common bean inbred lines with high iron and zinc concentrations in grains were obtained by plant breeding (Blair, 2013;Pereira et al, 2014;Teixeira et al, 2015). Preliminary studies showed that it was possible to increase phosphorus and copper concentrations in common bean grains in 19.17 and 46.78%, respectively, in F 2 generation Poersch et al, 2013).…”

“…Since selection of superior common bean inbred lines for agronomic performance and mineral concentration in grains is efficient, it is necessary to know the magnitude of genetic parameters estimates. In common bean inbred lines, it was obtained high heritability for cycle (Faleiro et al, 2002), insertion of the first pod (Ribeiro et al, 2009;Jost et al, 2013), grain yield (Ribeiro et al, 2009;Torga et al, 2010;Jost et al, 2013), and zinc concentration (Teixeira et al, 2015). For potassium, phosphorus and copper concentrations in common bean, the genetic parameters estimates are restricted to early generations.…”