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

Abstract

The objective of this study was to estimate genetic parameters for agronomic and nutritional traits in four common bean populations with biofortified grains for minerals, and to identify the superior population for these traits. Thus, four common bean populations were obtained by controlled crossings between parents contrasting for potassium (P 1 ), phosphorus (P 2 ), zinc (P 3 ) and copper (P 4 ). A total of 40 lines in F 6:8 generation of each population and nine parents were evaluated in two field experiments (rainy season of 2012 and dry season of 2013) in the state of Rio Grande do Sul, Brazil. The studied populations presented genetic variability for cycle, insertion of the first pod, grain yield, and potassium, phosphorus and zinc concentrations in grains. Heritability estimates and selection gain of intermediate and high magnitude were obtained for cycle, insertion of the first pod, grain yield, and potassium concentration in grains in P 2 . In P 4 , insertion of the first pod, grain yield and phosphorus and zinc concentrations in grains presented high heritability and selection gain estimates. From the tested crossings, it is possible to select common bean inbred lines biofortified for potassium, phosphorus and zinc and with high agronomic performance.

Research Article Genetic parameters and combined selection for seed coat color and macrominerals in Mesoamerican common bean lines

“…Thus, the study of the genetic parameters of macrominerals is of the utmost importance. The heritability of the potassium concentration in Mesoamerican common beans ranged from low to intermediate magnitude (h 2 : 28.80 to 59.10%) at the F 6:8 generation (Maziero et al, 2016), and the calcium concentration had high heritability (h 2 : 64.78 to 66.85%) at the F 7 generation (Ribeiro et al, 2014). Heritability estimates for magnesium concentration in a recombinant inbred line population of common bean were not found in published reports.…”

“…Data obtained were subjected to analysis of variance, according to the augmented block (F 5:6 generation) and simple lattice (F 5:7 generation) designs. The efficiency of the simple lattice design, compared to a randomized block design was determined as described by Maziero et al (2016).…”

“…A significant treatment effect for the concentrations of potassium, calcium, and magnesium was verified in the analysis of variance at the F 5:6 and F 5:7 generations (Table 1), indicating that there is genetic variability for the macromineral concentrations among Mesoamerican common bean lines. Previous studies showed that was possible to develop common bean lines with high concentrations of potassium (Maziero et al, 2016), calcium Ribeiro et al, 2014), and magnesium from controlled crosses between parents with contrasting macromineral concentrations. These results evidence that it is possible to launch common bean cultivars with biofortified grains for macrominerals, meeting a world-wide demand for foods with high nutritional value.…”

“…Biofortification for macrominerals is recent in common beans. Breeding programs developed Mesoamerican common bean lines with high concentrations of potassium (Maziero et al, 2016), calcium Ribeiro et al, 2014), and magnesium . Potassium, calcium, and magnesium are the largest cations found in beans (Suárez-Martínez et al, 2016).…”

Inheritance pattern of zinc (Zn) concentration in Middle American and Andean common bean (Phaseolus vulgaris L.) seeds

“…Therefore, it is possible to develop common bean cultivars with high zinc concentration in the seeds in both gene pools. The potential of beans for biofortification for zinc has been evaluated, and results obtained by classic breeding (Mukamuhirwa et al, 2015;Teixeira et al, 2015;Maziero et al, 2016) and molecular methods Cichy et al, 2009;Blair et al, 2010b;Blair and Izquierdo, 2012) are promising. Backcross has been used to transfer high zinc concentration from wild beans to cultivated beans, and biofortified recombinants have been identified by molecular marker analysis (Blair and Izquierdo, 2012).…”