Research Article Combining ability in snap bean lines in Brazil

Abstract

The search for genetic material of snap beans with desirable yield traits is of utmost importance for yield increase in Brazil. We evaluated 12 snap bean genotypes by diallel crosses that presented characteristics of interest, so as to select the best genitors to generate productive populations in the snap bean breeding program of the Universidade Estadual do Norte Fluminense in Rio de Janeiro state, Brazil. Diallel crosses were performed applying Method 2 of Griffing. The F 1 generation, composed of 36 hybrid combinations, was evaluated in a greenhouse, in a completely randomized design with two replicates. The traits evaluated were: pod weight, length, width and thickness, number of seeds and seed weight. There were significant differences among genotypes for most variables, indicating genetic variability between snap bean lines. The following genitor genotypes proved to be the most suitable when the trait to be improved was yield: Top Seed Blue Line, UENF 1445, UENF 7-20-1, and UENF 7-10-1. The hybrids with higher values of combining ability estimates are indicated to generate promising segregating populations. Thus L3 (Top Seed Blue Line) × L18 (UENF 9-24-2), and L12 (UENF 7-14-1) × L1 (UENF 1445) hybrid combinations showed the best estimates of specific combining ability for the traits under evaluation, suggesting a high probability of obtaining superior ©FUNPEC-RP www.funpecrp.com.br Genetics and Molecular Research 18 (2): gmr18214 A.B.S. Gomes et al. 2 genotypes. The efficiency of selection for these traits is based on additive genic action and demonstrates progress in the of snap bean breeding program.

Diallel Analysis of Dry Bean Varieties for Seed Yield and Important Traits for Calcareous Soils

“…GCA and SCA effects are determined according to the differences between parents and crosses from the general average. The results we obtained are largely similar to the results obtained in the of Ceyhan and coauthors (2014a,b), Kepildek and Ceyhan (2021), Oliveira Junior and coauthors (1997), Ceyhan and Şimşek (2021), Arunga and coauthors (2014), Senbetay and Tesfaye (2015), Gomes and coauthors (2019), and Tamüksek and Ceyhan (2022) [12][13][14]23,25,28,30,32,33].…”

“…The fact that ʋ 2 GCA/ʋ 2 SCA greater than 1 and H/D 1/2 1 for the number of seeds per plant and hundred-seed weight in the plant shows the additive gene effect (Table 2). Additive gene effects for these traits in bean have been reported in previous studies by Arunga and coauthors (2014), Senbetay and Tesfaye (2015) and Gomes and coauthors (2019) [30,32,33]. In contrast to our finding, Ceyhan and coauthors (2014a,b), Kepildek and Ceyhan (2021), Oliveira Junior and coauthors (1997), and Ceyhan and Şimşek (2021) reported that the nonadditive gene effect and the dominant gene effect were effective in the inheritance of number of seeds per plant and hundred-seed weight of the bean plant [12][13][14]25,28].…”

Habilidad combinatoria de los caracteres relacionados con la producción de habichuela (Phaseolus vulgaris L.)

“…Estas altas y positivas estimaciones de ĝi y promedio per se muestran una alta varianza aditiva, lo que convierte a estos progenitores en fuertes candidatos para producir buenas progenies. Estos resultados son similares a los encontrados por Gomes et al (2019), quienes afirmaron que los efectos ĝi positivos son indicadores útiles para el carácter LDV y, posteriormente, sugirieron que estos podrían ser explotados para la obtención de líneas superiores de habichuela.…”