Data/hora: 02/06/2024 08:41:12

Provedor de dados: | Scientia Agricola
País: | Brazil
Título: | Sources of resistance to Crinipellis perniciosa in progenies of cacao accessions collected in the Brazilian Amazon
Autores: | Paim,Valéria Rodrigues Lavigne de Mello; Luz,Edna Dora Martins Newman; Pires,José Luís; Silva,Stela Dalva Vieira Midlej; Souza,Jorge Teodoro de; Albuquerque,Paulo Sérgio Bevilaqua; Santos Filho,Lindolfo Pereira dos.
Data: | 2006-12-01
Ano: | 2006
Palavras-chave: | Theobroma cacao; Genetic breeding; Resistance; Witches' broom disease.
Resumo: | The witches' broom disease caused by the fungus Crinipellis perniciosa is the main phytossanitary constraint for cacao production in Brazil. The integrated management of the disease involves resistance as one of the components. The breeding program conducted by the Brazilian Institution, CEPLAC is directed toward the pyramidation of resistance genes from different sources to achieve a more durable resistance. This study aimed to identify sources of resistance in progenies of cacao accessions collected in the basins of ten Amazonian rivers and compared to progenies from the Peruvian clones 'Scavina 6' and 'Sacavina 12'. Progenies from 40 Amazonian accessions and 'Scavina' were evaluated in the field for six years for witches' broom resistance through multivariate and repeated measurement analyses evaluating the effect of progeny, area, block, year, and their interactions. There were differences in the mean number of vegetative brooms on some Amazonian progenies and 'Scavina' descendants. There was an increase in the number of vegetative brooms in the last year for 'Scavina' progenies, but that was not observed for the Amazonian progenies 64, 66, 156, 194, 195, 269 and 274. There were different gene/alleles for resistance in the Amazonian progenies in comparison to the traditional 'Scavina' accessions. These new sources of resistance will be important for pyramiding resistance genes and consequently increasing the stability and durability of the resistance to witches' broom.
Tipo: | Info:eu-repo/semantics/report
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000600011
Editor: | São Paulo - Escola Superior de Agricultura "Luiz de Queiroz"
Relação: | 10.1590/S0103-90162006000600011
Formato: | text/html
Fonte: | Scientia Agricola  v.63 n.6 2006
Fonte: | info:eu-repo/semantics/openAccess