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Santa Maria do Suaçuí, Brazil

Maziero S.M.,DF CCR UFSM | Ribeiro N.D.,DF CCR UFSM | Storck L.,DF CCR UFSM

The objective of this study was to identify the most efficient selection strategy to select common bean lines with erect architecture, high grain yield and high concentration of potassium, phosphorus, zinc and copper in grains. For this purpose, 160 F6:8 common bean lines and nine parents were evaluated in two growing seasons in Santa Maria/RS, Brazil. The tested selection strategies were direct selection, and six different selection indices were used: classic, base, parameters and weight-free, based on desired gains, multiplicative and rank sum. Two economic weights were established: genetic the variation coefficient and 10 % gain in relation to the mean, tested without restriction (weights in all characters) and with restriction (economic weight equal to zero for two minerals). The grain yield was not correlated with the insertion of the first pod; however, it showed low negative correlation with the potassium (r = −0.29), phosphorus (r = −0.41) and zinc concentrations (r = −0.34) at 1 % probability. The direct selection enabled a high selection gain for individual characters, but caused undesirable changes in the other characters under selection. The selection indices were not in agreement in the identification of superior common bean lines and the use restriction was not advantageous in selection. The multiplicative index is the most efficient strategy of simultaneous selection for erect architecture, high grain yield and high potassium, phosphorus and zinc concentrations in grains in common bean lines. L 72, L 97, L 137 and L 146 are the most promising common bean lines and will be selected to compose the preliminary evaluation trial. © 2015, Springer Science+Business Media Dordrecht. Source

Possobom M.T.D.F.,DF CCR UFSM | Ribeiro N.D.,DF CCR UFSM | Zemolin A.E.M.,DF CCR UFSM | Arns F.D.,DF CCR UFSM

Seed coat colour of bean seeds is decisive for acceptance of a cultivar. The objectives of this research were to determine whether there is maternal effect for “L”, a* and b* colour parameters in Middle American and Andean bean seeds; to obtain estimates of heritability and gain with selection for “L”, a* and b* values; and select recombinants with the seed coat colour required by the market demand. Thus, controlled crossings were carried out between the Middle American lines CNFP 10104 and CHC 01-175, and between the Andean lines Cal 96 and Hooter, for obtaining F1, F1 reciprocal, F2 and F2 reciprocal generations for each hybrid combination. Parents and generations were evaluated in two field experiments (2012 normal rainy and 2013 dry seasons) in the state of Rio Grande do Sul, Brazil. Seed coat colour was quantified with a portable colorimeter. Genetic variability for “L” (luminosity), chromaticity a* (green to red shade), and chromaticity b* (blue to yellow shade) values was observed in seeds with F2 seed coat of Middle American and Andean beans. “L”, a* and b* values in bean seeds presented maternal effects. High broad-sense heritability are observed for luminosity (h2b: 76.66–95.07 %), chromaticity a* (h2b: 73.08–89.31 %), and chromaticity b* (h2b: 88.63–92.50 %) values in bean seeds. From the crossings, it was possible to select bean seeds in early generation for the black group, and for carioca and cranberry types (dark or clear background) which present the colour required by the market demand. © 2014, Springer International Publishing Switzerland. Source

da Rosa S.S.,DF CCR UFSM | Ribeiro N.D.,DF CCR UFSM | Jost E.,DF CCR UFSM | Reiniger L.R.S.,DF CCR UFSM | And 3 more authors.

A large proportion of the world's population is at risk of developing symptoms of zinc deficiency due to its low levels in food. The objective of this research was to estimate the heritability in early hybrid generations for the zinc content character in seeds of common bean (Phaseolus vulgaris L.), to investigate possible maternal effects on zinc contents and to evaluate the potential for genetic improvement. Reciprocal F1, and F2 generations as well as backcross (RCP1 and RCP2) populations were produced by crosses of three cultivars. The seed zinc content was measured by the nitric-perchloric digestion method and using the atomic absorption spectrophotometer. The range of variation in zinc content among tested progenies was from 21.76 mg kg-1 dry matter to 53.48 mg kg-1 dry matter, and no significant maternal effect was discovered. Narrow sense heritability was of an intermediate 57.5% to high 77.84% value and transgressive segregation was observed. These results suggest that breeding for increased zinc content in the seeds of common bean can be quite successful; an increase of 37.3% was obtained using just the three parents tested in this study. © 2010 Springer Science+Business Media B.V. Source

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