Genetic variability in domesticated Capsicum spp as assessed by morphological and agronomic data in mixed statistical analysis

Abstract

Capsicum species are very important in Brazil because of economic, cultural and biological factors, and the country is considered to be a diversity center for this genus. Collection and maintenance of the genetic diversity in Capsicum are important to avoid genetic erosion. Besides the identification of species, the characterization and evaluation of accessions maintained in gene banks are of fundamental importance. For this purpose, multivariate methods have become an important tool in the classification of conserved genotypes. The objectives of this study were: i) to identify and characterize accessions of the Capsicum spp collection and draw conclusions about the potential use of certain accessions in different production sectors; ii) to estimate the genetic divergence among accessions using the Ward-MLM procedure, and iii) to evaluate the efficiency of the analysis of continuous and categorical data using the Ward-MLM procedure. Fifty-six Capsicum spp accessions were evaluated based on 25 descriptors, 14 of which were morphological and 11 agronomic. Based on the qualitative descriptors, it was possible to identify all species and, together with the agronomic descriptors, genotypes could be indicated with potential for use in various production sectors. Five was determined as the ideal number of groups by the criteria pseudo-F and pseudo-t 2 . The Ward-MLM procedure allowed the differentiation of the species C. annuum, C. frutescens, C. baccatum, and C. chinense in separate groups. The Ward-MLM procedure showed some level of efficiency in clustering Capsicum species analyzing morphological and agronomic data simultaneously.

Validação de marcadores moleculares associados à pungência em pimenta

“…Apresenta grande importância econômica por sua rentabilidade quando se agrega valor ao produto e/ou por sua importância social, como exemplo prático de agricultura familiar e com grande geração de empregos. O cultivo desta hortaliça tem se tornado um importante segmento no setor agrícola no país devido à crescente demanda do mercado consumidor (Sudré & Gonçalves, 2010).…”

Gene effect and heterosis in Capsicum baccatum var. pendulum

“…has played an important role in the market of fresh vegetable crops, condiments, spices and preserved food in Brazil (FONSECA et al, 2008;MOURA et al, 2010;SUDRÉ et al, 2010). This market is Ciência Rural, v.44, n.6, jun, 2014.…”

Genetic diversity in sugarcane varieties in Brazil based on the Ward-Modified Location Model clustering strategy

“…rapa L. and Capsicum spp. (Padilla et al, 2005;Ortiz et al, 2008;Barbé et al, 2010;Sudré et al, 2010;Cabral et al, 2010;). This technique is therefore an important statistical tool to be incorporated into sugarcane breeding programs to evaluate genetic diversity in germplasm banks, assisting in the definition of crossing strategies to increase efficiency in the generation of transgressive genotypes.…”