Data/hora: 13/06/2024 04:50:56

Provedor de dados: | 65
País: | Brazil
Título: | Characterization of Alternaria isolates and reaction of potato genotypes to early blight
Autores: | Alvarenga,Thayssa Vilela Miguel; Ribeiro,Silvia Regina Rodrigues de Paula; Souza,Elaine Aparecida de; Pereira,Francielly de Cássia; Pinto,César Augusto Brasil Pereira.
Data: | 2016-10-01
Ano: | 2016
Palavras-chave: | Alternaria grandis; Alternaria solani; Mycelial compatibility; Aggressiveness; Genetic resistance.
Resumo: | ABSTRACT: Early blight is one of the most important fungal diseases of potato. The objective of this study was to evaluate the in vitro reaction of potato genotypes to the severity of early blight and compare the species Alternaria solani and  Alternaria grandis , etiologic agents of disease, through the evaluation of physiological characteristics. Twenty-two genotypes of the Potato Breeding Program at UFLA, two cultivars, Aracy and Bintje, patterns of resistance and susceptibility, respectively were evaluated. For inoculation, three isolates of A. grandis and two isolates of A. solani were used. Plantlets obtained in vitro were inoculated with a 5mm diameter mycelial disk of isolates Alternaria spp. of. These were incubated in severity and classified according to the rating scale. Isolates of  Alternaria spp. were evaluated for mycelial growth index (MGI) and for formation of mycelial compatibility groups (MCG). The methodology for evaluating the in vitro reaction of genotypes to severity of early blight was efficient for both isolates. The isolates of A. solani and A. grandis were similar in their aggressiveness. The isolates of  A. grandis MGI's had higher, and therefore mycelium grew faster when compared to those isolated from A. solani . The occurrence of mycelial compatibility among isolates of  A. solani and A. grandis indicated the possible occurrence of parasexual cycle.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782016001001783
Editor: | Universidade Federal de Santa Maria
Relação: | 10.1590/0103-8478cr20151447
Formato: | text/html
Fonte: | Ciência Rural  v.46 n.10 2016
Fonte: | info:eu-repo/semantics/openAccess