Pablo Diego Silva Cabral

Análise de trilha do rendimento de grãos de feijoeiro (Phaseolus vulgaris L.) e seus componentes

Fifty-eight genotypes of common bean (Phaseolus vulgaris L.), being 32 local genotypes, 20 genotypes from EMBRAPA and six commercial cultivars were evaluated in Alegre/ES, through the influence of eight characters of agronomic importance to grain production by unit area. The experiment was conducted in a randomized block design with three replications in the wet period of 2008/09 crop year. This study aimed to estimate the path coefficients between the primary and secondary characters on grain yield. The primary characters were set up by the number of seeds per pod (NSV), weight of one hundred grains (P100), number of pods per plant (NVP) and number of seeds per plant (NSP) and the secondary traits were number of days from germination to flowering (FL), number of days between emergence and harvest maturity (MC), plant height (EP), height of the first pod (PIV). The analysis of the path coefficient showed that the primary character with more direct effect on yield (PROD) was NVP (1.0011), associated with high correlation (0.754). Variables P100 and NSV showed high indirect effect on NVP of 0.8848 and 0.6369, respectively. It was observed an increase in P100 and NVP in plants with short cycle and growing season and first pod height taller, and that the height of the first pod did not significantly influence productivity.

Diversidade genética de acessos de feijão comum por caracteres agronômicos

This research aimed to evaluate the genetic divergence among 57 accessions of common bean genotypes being 31 genotypes from southern Espirito Santo, Brazil, 20 cultivars from EMBRAPA and 6 commercial cultivars. Three experiments were conducted in the agricultural years 2008/2009 and 2009/2010, two in the experimental area and a CCA-UFES at IFES, both sites in the municipality of Alegre, ES, Brazil. The desing was a randomized block with tree replications. Data were subjected to analysis of variance test by F. By multivariate analysis assessed the genetic diversity among accessions using the UPGMA clustering method and canonical variables based on the Mahalanobis distance. The variables that contributed most to the separation of the accessions were one hundred seed weight (P100) with 24.01%, growing season (PV) with 20.39%, reproductive period (PR) with 17.16% and seed length (CS) with 14.87%. The accessions were less divergent the F15 and F18 (9.18) and the most divergent F10 and F08 (1308.62). Multivariate analysis showed a low genetic similarity between cultivars and also between accessions from EMBRAPA and between them. Site accesses demonstrated significant genetic diversity. Both the cluster analysis and the canonical variables were able to separate the access according to the centers of origin.