Data/hora: 10/06/2024 04:53:25

Biblioteca(s): | Embrapa Cerrados; Embrapa Milho e Sorgo.
Data corrente: | 21/11/2006
Data da última atualização: | 15/01/2008
Autoria: | FALEIRO, F. G.; QUEIROZ, V. T.; LOPES, U. V.; GUIMARÃES, C. T.; PIRES, J. L.; YAMADA, M. M.; ARAÚJO, I. S.; PEREIRA, M. G.; SCHNELL, R.; SOUZA FILHO, G. A.; FERREIRA, C. F.; BARROS, E. G.; MOREIRA, M. A.
Título: | Mapping QTLs for witches'broom (Crinipellis perniciosa) resistance in cacao (Theobroma cacao L.).
Ano de publicação: | 2006
Fonte/Imprenta: | Euphytica, v. 149, p. 227-235, 2006.
Idioma: | Inglês
Conteúdo: | Summary: Molecular markers (RAPD, AFLP and microsatellites) were used to generate a linkage map and to identify QTLs associated to witches broom (Crinipellis perniciosa) resistance in cacao (Theobroma cacao), using 82 individuals of an F2 population derived from the clones  ICS-1 (susceptible) and Scavina-6 (resistant). Fifteen evaluations of the number of brooms have been carried out in six years (1997-2000). In order to increase the precision and accuracy in the measures of resistance, each F2 plant was cloned in three replications in randomized block desing with single-tree plots and evaluated over 2 years. Three hundred and forty-two markers were obtained, being 33 microsatellites, 77 AFLPs and 323 RAPDs. The distribution of the number of brooms in the F2 population was skewed to resistance, suggesting the involvement of major genes controlling resistance and the repeatability estimated for resistance was 44%. A strong piutative QTL was detected as being related to witches' broom resistance. Associated to this QTL, the microsatellite mTcCIR35 explained 35.5% of the phenotypic variation in resistance. This marker is being used for marker-assisted selection in Scavina-6 progenies, including those selected in private plantations, as an auxiliary tool to the phenotypic selection.
Palavras-Chave: | Theobroma cacao L.
Thesagro: | Cacau; Crinipellis Perniciosa; Doença; Doença de Planta; Fruticultura; Marcador Molecular; Resistência.

Categoria do assunto:

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S Ciências Biológicas

Registro original: | Embrapa Cerrados (CPAC)

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CNPMS - (19587-1) - UPC - AP - DD -  -  -  - DIS
CPAC - (27640-1) - UPC - AP - -- - CRI7005 -  - CRI7005 - DIS