Identification of minimum descriptors for characterization of Capsicum spp. germplasm
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2013-06
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Resumo
This study was proposed to select minimum descriptors to the
characterization of accessions of Capsicum spp. from Embrapa
Hortaliças germplasm bank, which are characterized mainly by
qualitative data. From this collection, 893 (420 C. annuum, 106 C.
baccatum, 307 C. chinense and 60 C. frutescens) were considered
because they were completely characterized by 56 morphological
descriptors. The statistical treatment was performed by factorial
multiple correspondence analysis, combined with estimation of
matrices of genetic dissimilarity among accessions for multicategoric
data. Lists of minimum descriptors were proposed for the whole
collection and for the subcollections related to the four cultivated
species. Around thirty minimum descriptors were selected for each
subcollection, maintaining a minimum of 0.90 for the correlation
between the dissimilarity matrices that consider all the descriptors
or only the selected minimum descriptors. These proposed lists
allow a reduction of around 50% in the number of initial descriptors.
The filament colour, mature fruit colour, number of locules, fruit
position, origin, pungency, fruit surface, stem length, plant height
and fruit length were selected as minimum descriptors, both to the
whole collection and their subcollections. Most of these descriptors
are related to the fruit traits of sweet and chilli peppers, which are
important for genetic breeding of Capsicum because are related to
storage, processing, marketing and consumption of commercial
derived products.
Descrição
Palavras-chave
Qualitative data, Discarding variables, Multicategoric variables, Multiple correspondence analysis, Dados qualitativos, Descarte de variáveis, Variáveis multicategóricas, Análise de correspondência múltipla
Citação
SILVA, Waldir C. Júnior e; CARVALHO, Sabrina Isabel C. de; DUARTE, João B. Identification of minimum descriptors for characterization of Capsicum spp. germplasm. Horticultura Brasileira, Recife, v. 31, n. 2, p. 190-202, Apr./June 2013.