Data/hora: 23/06/2024 18:36:15

Biblioteca(s): 	Embrapa Hortaliças.	
Data corrente: 	19/12/2003	
Data da última atualização: 	26/01/2024	
Autoria: 	REIS, A.; SMART, C. D.; FRY, W. E.; MAFFIA, L. A.; MIZUBUTI, E. S. G.	
Afiliação: 	AILTON REIS, CNPH; CHRISTINE D. SMART, CORNELL UNIVERSITY; WILLIAM E. FRY, CORNELL UNIVERSITY; LUIZ A. MAFFIA, UNIVERSIDADE FEDERAL DE VIÇOSA; EDUARDO S. G. MIZUBUTI, UNIVERSIDADE FEDERAL DE VIÇOSA.	
Título: 	Characterization of isolates of Phytophthora infestans from Southern and Southeastern Brazil from 1998 to 2000.	
Ano de publicação: 	2003	
Fonte/Imprenta: 	Plant Disease, v. 87, n. 8, p. 896-900, ago. 2003.	
ISSN: 	0191-2917	
DOI: 	10.1094/PDIS.2003.87.8.896	
Idioma: 	Inglês	
Conteúdo: 	The population of Phytophthora infestans in Brazil was first characterized 12 years ago. In this research, isolates of P. infestans from potato (n = 184) and tomato (n = 267) collected in south-ern and southeastern Brazil were characterized to provide more detailed analysis of the current structure of the population. All 451 isolates were analyzed for mating type, and subsets of theisolates were analyzed for allozymes, restriction fragment length polymorphism fingerprint, mtDNA haplotypes, and metalaxyl resistance. Tomato isolates were all of A1 mating type, mtDNA Ib, and US-1 genotype or some variant within this clonal lineage. Of the potato isolates, 82% were A2 mating type, mtDNA IIa, BR-1 genotype, which is a new lineage of P. infestans. All A2 isolates were found on potato, whereas 91% of the A1 isolates were from tomato. A1 and A2 isolates were never found in the same field. The frequency of resistance to metalaxyl was higher in isolates from tomato (55%) than in isolates from potato (38%). After more than a dec-ade of coexistence of isolates of the A1 and A2 mating types, the population was highly clonal,dominated by the BR-1 and US-1 clonal lineages.	
Palavras-Chave: 	Diversidade genética.	
Thesagro: 	Batata; Doença; Lycopersicon Esculentum; Phytophthora Infestans; Solanum Tuberosum; Tomate.	
Categoria do assunto: 	S Ciências Biológicas	
Registro original: 	Embrapa Hortaliças (CNPH)	
Exemplares: 	CNPH - (26821-1) - UPC - AP - DD - 016732 -  - 016732 - DIS