U.S. Department of Agriculture: Agricultural Research Service, Lincoln, Nebraska
Date of this Version
3-2017
Citation
ANNUAL REPORT OF THE BEAN IMPROVEMENT COOPERATIVE, No. 60, March 2017. Published by USDA.
Abstract
INTRODUCTION: The snap bean belong to the same botanical Family and species of common bean (Phaseolus vulgaris L.), however is classified as a vegetable because its immature pods with tenuous grains are the consumed part, thus is essential the obtaining of genotypes that ally high yields and great pod quality. An alternative, which has been used to direct new improvement programs, is the study of genetic dissimilarity (Freiria et al., 2016).
The aim of this study is to evaluate the genetic dissimilarity of tem snap beans genotypes based on yield and production components, with the intent to identify the most promising crosses.
MATARIAL & METHODS: The rehearsal was conducted at Universidade Estadual de Londrina (UEL), located in latitude of 23º19’41.00” S, longitude of 51º12’18.19” W and altitude of 590 meters (Londrina, Parana state, Brazil). The design was completely randomized blocks with three repetitions, being each treatment composed by the tem genotypes of snap beans: Feltrin Vicenza Amarelo Baixo, UEL 1, UEL 2, T1, T3, T13, T24, T25, T39 and T41. Each parcel was composed by four lines (4m length) with a spacing of 0.50m between lines and were considered as borders the two external and 0.50m from the extremities of the central lines.
The seedling was in March 18th 2016 and the harvest realized in June 10th of the same year (fall/winter cultivation). Were measured the characteristics: Yield of pods (kg ha-1), unitary pod´s fresh mass (g), number of pods per plant, pods diameter (mm) and length of pods (cm). For the dissimilarity analysis, the Mahalanobis generalized distance was estimated and was proceeded the cluster of UPGMA. The relative contribution of the characters was estimated based on Singh (1981). Also was made the main compounds analysis.
Comments
U.S. government work.