Distinctness, uniformity and stability and GT biplot tests for the selection of snap bean lines

Resumo

 The lack of records about snap bean cultivars is one of the obstacles that has led to a yield gap and low prominence of the crop. This work aimed at indicating snap bean lines obtained by the Breeding Program of the UniversidadeEstadual do Norte Fluminense-UENF to assess their performance and to apply for a certificate of plant variety protection. The study was managed using a randomized block design with three replicates in a greenhouse at the Research Support Unit of the UENF. Nine candidate lines were compared to the commercial cultivar “Topseed Blue Line” in accordance with 56 descriptors set by the National Plant Variety Rights. All lines presented themselves as homogeneous. The L31 line provided a total of 30 different descriptors of the commercial cultivar. For the quantitative data added to the DUS tests, it was performed the analysis of variance and the GT biplot generated by the R software. Variability was noticed among the genotypes for all the traits assessed, excepting days of germination and seed thickness. The lines that showed the best mean performance were the L6, L7, L10, L11, and L13 ones. Among those, the L6 and L11 lines provided bigger stability.