HERITABILITY AND GENETIC PARAMETERS FOR SIZE-RELATED TRAITS IN ORNAMENTAL PEPPER (CAPSICUM ANNUUM L.)

F.L.G. Fortunato, E.R. Rêgo, M.M. Rêgo, C.A. Pereira dos Santos, M. Gonçalves de Carvalho
Peppers have increasingly been used as ornamental plants, because they show a wide variation in foliage, fruit with intense color, and growth habits. The aim of this work was to study the heritability of quantitative size-related traits in ornamental pepper (Capsicum annuum). The experiment was conducted in the Laboratory of Plant Biotechnology of the Universidade Federal da Paraíba, in Areia-PB, Brazil. Six lines of pepper belonging to the germplasm bank of CCA-UFPB (UFPB 346, UFPB 347, UFPB 348, UFPB 349, UFPB 355 and UFPB 356) were used as parents in a half diallel cross. Evaluated traits were plant height, canopy width, stem length, stem width, leaf length, leaf width, corolla length, petal width, anther length, and style length. The experimental design was completely randomized with five replicates. Data were first subjected to analysis of variance, and the diallel analysis was performed afterwards according to the methodology of Hayman. This methodology is not based on previously established statistical models, but based on the knowledge of the nature of environmental and genetic statistics, such as means, variance and covariance, obtained from the diallel analysis. The effects of treatment (parents and F1 hybrids) were significant for all traits. All traits were adequate in the test of sufficiency to the additive-dominant model. Recessive alleles were responsible for the increase in stem width and petal width. All other evaluated traits were increased by dominant alleles. The broad-sense heritability was high for all evaluated traits, indicating that most of the observed phenotypic variation is genetic and will be transmitted to the progenies. For most evaluated traits, with the exception of canopy width and leaf length, the narrow-sense heritability ranged from 0.93 to 0.59, revealing a greater contribution of additive effects on trait expression. Mass selection could be an appropriate method for improving these traits.
Fortunato, F.L.G., Rêgo, E.R., Rêgo, M.M., Pereira dos Santos, C.A. and Gonçalves de Carvalho, M. (2015). HERITABILITY AND GENETIC PARAMETERS FOR SIZE-RELATED TRAITS IN ORNAMENTAL PEPPER (CAPSICUM ANNUUM L.). Acta Hortic. 1087, 201-206
DOI: 10.17660/ActaHortic.2015.1087.24
https://doi.org/10.17660/ActaHortic.2015.1087.24
diallel analysis, Capsicum, heritability
English

Acta Horticulturae