Combining ability for morphoagronomic traits in common bean and snap bean

Abstract

The present study aimed to estimate the combining ability for agronomic traits of interest in genotypes ofPhaseolus vulgaris by means of the Griffing diallel. To this end, six parents were crossed in a complete diallel scheme without reciprocals, namely, two common bean genotypes (PI207262 and BAC 6) and four accessions of snap-bean (UENF 1482, 1486 UENF, UENF 1487, UENF 1579). Twelve morphoagronomic traits of interest for the culture of the snap bean were evaluated. There were significant differences for all morphoagronomic traits evaluated, except for the fiber content in the pod. Concerning the source of variation general and specific combining ability (GCA and SCA, respectively), there was a significant effect for most traits studied, except for the dry mass of the aerial part and diameter of the pod, which were not significant for SCA. Based on the data obtained, the cross between the parents of common bean PI207262 and BAC 6 and the parents of snap bean UENF 1487 and UENF 1486 is recommended, so as to obtain superior genotypes in advanced generations. Due to the occurrence of effects of both GCA and SCA in the control of morphoagronomic traits in the population assessed, the use of methods of conducting segregating populations focused on parental control is recommended, such as the Pedigree method. Key words: Phaseolus vulgaris L., yield components, general combining ability, specific combining ability.