Data/hora: 09/06/2024 17:41:31

Biblioteca(s): 	Embrapa Meio Norte / UEP-Parnaíba.	
Data corrente: 	18/06/1996	
Data da última atualização: 	18/06/1996	
Autoria: 	BATA, H. D.; SINGH, B. B.; SINGH, S. R.; LADEINDE, T. A. O.	
Título: 	Inheritance of resistance to aphid in cowpea.	
Ano de publicação: 	1987	
Fonte/Imprenta: 	Crop Science, v.27, p.892-894, 1987.	
Idioma: 	Inglês	
Conteúdo: 	Aphid (Aphis craccivora Kock) is a major pest of cowpea (Vigna unguiculata L.) Walp) particularly in the drier regions of the tropics. It causes direct damage by feeding on the plants and also transmits viruses. Several sources of resistance to cowpea aphid have been identified and efforts are underway to develop aphid-resistant cultivars of cowpea. This study was undertaken to elucidate the inheritance of resistanceto aphid in cowpea. Three resistant lines were used in the study. Parental, F1, F2, F3 and backcross populations involving resistant x  susceptible and resistant x resistant lines were evaluated in the greenhouse using artificial with aphids. The F1 plants in all the crosses wereresistant and the F2 population derived from all the crosses involvingresistant and susceptible parents segregated into 3 resistant susceptible ratio. The backcross populations involving susceptible parents segregated into 1 resistant; 1 susceptible ratio, whereas the backcross populations involving resistant parents were completely resistant. The F3 progenics derived from resistant F2 showed a ratio of 1/3 true breeding resistant; 2/3 segregating like F2's. These data indicated monogenic dominant inheritance of aphid resistance. The gene symbol Rac (resistance to Aphis craccivora) is being assigned for this trait.	
Palavras-Chave: 	Afideos; Aphids; Caupi; Cowpea; Insectos; Insetos.	
Thesagro: 	Aphis Craccivora; Vigna Unguiculata.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Meio Norte / UEP-Parnaíba (CPAMN-UEPP)	
Exemplares: 	CPAMN-UEPP - (6450-1) - ADP - SP - -- -  -  - 1991.04047 - DIS