RESUMO -ABSTRACT -The cultivation of the special-grain bean is still limited in Brazil. The objectives here therefore, were: i) to evaluate the effects of the interaction of line and environment on the characteristics that control the agronomic performance and cooking time in special-grain beans lines, and ii) to identify those lines having a high agronomic performance and reduced cooking time. To do this, 29 special-grain beans lines were evaluated for different locations, years and growing seasons. Significant interaction of line and environment was observed for all the traits evaluated. The Light Red Kidney, Red Kanner, Montcalm, Chinock and BRS Radiante lines showed a similar grain yield for the four environments. The tested lines have a semi-early or early cycle and desirable morphological characteristics. The following values for the clarity of the grain tegument were obtained for white beans (72.85 to 82.25), cranberry (33.06 to 62.57), red (24.51 to 43.69), green (57.01 to 62.36) and pink (49.95 to 55.60). Cooking time varied from 14 min and 38 sec to 36 min and 21 sec. The special-grain beans lines of red tegument (Light Red Kidney, Red Kanner, Montcalm and Chinock) and cranberry (BRS Radiante) show high agronomic performance and reduced cooking time under the evaluated conditions.

-The objective of this work was to evaluate the genetic variability of common bean lines for cycle, weight of 100 grains, grain yield, cooking time, and grain calcium and iron concentrations. Twenty-four common bean lines were evaluated in two crop cycles

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 (h(2)b: 76.66-95.07%), chromaticity a* (h(2)b: 73.08-89.31%), and chromaticity b* (h(2)b: 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.

ResumoO melhoramento de feijão de grãos especiais ainda é restrito no Brasil. Portanto, foram objetivos deste trabalho avaliar os efeitos da interação linhagem x ambiente sobre os componentes da produtividade de grãos em feijão de grãos especiais, selecionar linhagens de alta produtividade de grãos e avaliar a associação linear e as relações diretas e indiretas entre os componentes da produtividade de grãos. Para tanto, 29 linhagens de feijão de grãos especiais foram avaliadas em diferentes locais, anos e épocas de cultivo. Interação linhagem x ambiente significativa foi obtida para o número de vagens por planta, o número de grãos por planta, o número de grãos por vagem, a massa de 100 grãos e a produtividade de grãos. As cultivares IAC Galante, Xamego, BRS MG Realce e Rosinha G2 apresentaram alta produtividade de grãos, sendo seu cultivo promissor para os ambientes avaliados. Coeficiente de correlação linear positivo foi obtido entre a produtividade de grãos e o número de vagens por planta (r=0,4704) e o número de grãos por vagem (r=0,4254). Esses caracteres também apresentaram os maiores efeitos diretos sobre a produtividade de grãos. A seleção indireta para o número de vagens por planta e o número de grãos por vagem é de eficiência moderada para o aumento da produtividade de grãos, em linhagens de feijão de grãos especiais.Palavras-chave adicionais: análise de trilha; correlação de Pearson; interação genótipo x ambiente; linhas puras; Phaseolus vulgaris L.. AbstractThe genetic improvement of special grains bean cultivars is still very limited in Brazil. The objective of this study was to evaluate the effects of the interaction line x environment on grain yield components in special grains bean cultivars, select high grain yield lines and to evaluate the linear association and the direct and indirect relations between the grain yield components. So, 29 special grains bean lines were studied in several places, years and cultivation time. Significant interaction line x environment was observed for number of pods per plant, number of grains per plant number of grains per pod, the mass of 100 grains and grain yield. Cultivars 'IAC Galante', 'Xamego', 'BRS MG Realce', and 'Rosinha' showed high grain yield and are thus indicated for cultivation under the studied conditions. A positive linear correlation coefficient was observed between grain yield and number of pods per plant (r=0.4704) and the number of grains per pod (r=0.4254). These characters had also the highest direct effects on grain yield. The indirect selection for number of pods per plant and the number of grains per pod is of moderate efficiency for grain yield increments.

ABSTRACT. The genetic parameter estimates of the iron and zinc concentrations in Andean common bean seeds were obtained using the IAC Boreal × Light Red Kidney and Ouro Branco × Light Red Kidney crosses. The parents and the F 1 , F 1 reciprocal, F 2 , F 2 reciprocal, and backcross BC 11 and BC 12 generations were evaluated in a field experiment that was carried out in the state of Rio Grande do Sul, Brazil. The iron concentration in Andean common bean seeds ranged from 24.70 to 102.40 mg kg -1 dry matter (DM), the zinc concentration ranged from 10.73 to 37.50 mg kg -1 DM, and no significant maternal effect was observed. The narrow-sense heritability ranged from low (h 2 n= 19.04%) to high (h 2 n= 63.60%) for the concentrations of iron and zinc, respectively. Hybrid vigor and transgressive segregation were observed for the iron and zinc concentrations in Andean common bean seeds. In the hybrid combination IAC Boreal × Light Red Kidney, it was possible to select recombinants for the iron and zinc biofortification program. From the tested hybrid combinations, recombinants with low iron and zinc concentrations in seeds could be selected to use when the diet needs to be restricted in those minerals.

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The study of the calcium use efficiency in common bean is unprecedented. Therefore, the objectives of this work were to evaluate the genetic variability of common bean lines for plant growth and grain yield characters, the calcium accumulation in different plant tissues at low and high calcium availabilities, and to select common bean lines with high calcium use efficiency and responsive to the calcium application by different indices. Twelve common bean lines were supplied with a nutrient solution at low (1.10 mmol L -1 ) and high (3.85 mmol L -1 ) calcium concentration and were evaluated. The L 15 line reached the higher values of dry mass of shoot, number of pods and grains per plant, number of grains per pod and grain yield at the low calcium concentration. Calcium accumulation in tissues was, on average, higher in leaves, followed by stems, pods and grains. The L 175 and L 159 lines have higher calcium concentration in grains (> 1.1 g kg -1 MS), regardless of the calcium concentration supplied to plants. The L15 line is efficient in calcium use. The L 221 and L 159 lines are responsive to the calcium application in the rooting medium.Key words: Common bean. Plants-calcium effect. Grains-production.RESUMO -O estudo da eficiência no uso de cálcio é inédita em feijão. Portanto, foram objetivos deste trabalho avaliar a variabilidade genética de linhagens de feijão para os caracteres do crescimento da planta e da produtividade de grãos e a acumulação de cálcio nos tecidos da planta em baixa e alta disponibilidade de cálcio e selecionar linhagens de feijão eficientes no uso de cálcio e responsivas a aplicação deste mineral por diferentes índices. Para tanto, 12 linhagens de feijão foram avaliadas em baixa (1,10 mmol L -1 ) e em alta (3,85 mmol L -1 ) concentração de cálcio na solução nutritiva. A linhagem L 15 produziu os maiores valores de massa seca de parte aérea, número de vagens e de grãos por planta, número de grãos por vagem e produtividade de grãos em baixa concentração de cálcio. A acumulação de cálcio nos tecidos foi, em média, maior nas folhas, seguidos pelos caules, vagens e grãos. As linhagens L 175 e L 159 possuem alta concentração de cálcio nos grãos (> 1,1 g kg -1 de MS), independente da concentração de cálcio fornecida às plantas. A linhagem L15 é eficiente no uso de cálcio. As linhagens L 221 e L 159 são responsivas à aplicação de cálcio no ambiente radicular. Palavras-chave:Feijão. Plantas-efeito do cálcio. Grãos-produção.