Mapping QTLs for Witches' Broom (Crinipellis Perniciosa) Resistance in Cacao (Theobroma Cacao L.) |
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| Authors: | Fábio Gelape Faleiro Vagner Tibaldi Queiroz Uilson Vanderlei Lopes Cláudia Teixeira Guimarães José Luis Pires Milton Macoto Yamada Ioná Santos Araújo Messias Gonzaga Pereira Raymond Schnell Gonçalo Apolinário de Souza Filho Cláudia Fortes Ferreira Everaldo Gonçalves Barros Maurílio Alves Moreira |
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| Institution: | (1) Centro de Pesquisas do Cacau, CEPLAC, Itabuna, BA, Brazil;(2) Currently Centro de Pesquisa Agropecuária dos Cerrados, Embrapa, Planaltina, DF, Brazil;(3) Instituto de Biotecnologia Aplicada à Agropecuária, Universidade Federal de Viçosa, Viçosa, MG, Brazil;(4) Departamento de Ciências Agrárias, Universidade Estadual Norte Fluminense, Campos, RJ, Brazil;(5) USDA/ARS, Miami, USA |
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| Abstract: | 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 (1997–2002). In order to increase the precision and accuracy in the measures of resistance, each F2 plant was cloned in three replications in a randomized block design with single-tree plots and evaluated over 2 years. Three hundred and forty-two markers were obtained, being 33 microsatellites, 77 AFLPs and 232 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 putative 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. |
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| Keywords: | molecular markers linkage map disease resistance |
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