Data/hora: 23/06/2024 04:13:21

Biblioteca(s): 	Embrapa Mandioca e Fruticultura.	
Data corrente: 	14/04/2004	
Data da última atualização: 	14/04/2004	
Autoria: 	AKANO, A. O.; DIXON, A. G. O.	
Título: 	Reactions four F1 mapping populations to cassava mosaic disease and cassava bacterial blight.	
Ano de publicação: 	1998	
Fonte/Imprenta: 	Revista Brasileira de Mandioca, Cruz das Almas, v.17, p.23, nov, 1998. Suplemento.	
Idioma: 	Inglês	
Conteúdo: 	Abstract: Cassava mosaic disease (CMD) and cassava bacterial blight (CBB) have limited stable and increased production of cassava, a major food source in sub-Saharan Africa. Crop improvement by breeding and selection should result in identification of more productive cultivars combining multiple pest resistance. A collaborative project between the International Institute of Tropical Agriculture (IITA) and International Center for Tropical Agriculture has been initiated to map genes conferring resistance to CMD and develop molecular markers for this trait in African germplasm. Four F1 mapping populations were generated between CMD resistant and susceptible germplasm through controlled hybridization. Hybrid seeds were germinated using embryo culture techniques developed at IITA. Progenies of the F1 populations were sub-cloned invitro to multiply the genotypes within each population. Woody cuttings were made from each genotype following transplanting of the resulting plantlets to a low disease pressure site. These were planted in replicated trials and evaluated for incidence and severity of CMD and CBB in different agroecologies in Nigeria. Data for a wide range of phenotypic quantitative trait loci (QTL) data obtained from the field screening of the mapping populations are discussed in relation to the environmental component of expression of disease resistance and the reaction of the various sources of resistance. The data would be correlated to the RFLP genetic map, to facilitate identification of QTL which are tighty linked to easily identifiable traits under field conditions (for indirect marker-assisted selection). Progress toward desired CMD resistant genotypes would be accelerated. Similarly development of gene pools with resistance to the disease would be facilitated.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Mandioca e Fruticultura (CNPMF)	
Exemplares: 	CNPMF - (20936-1) - ADD - AP - -- - 633.68205 -  -  - DIS