Use este identificador para citar ou linkar para este item: https://locus.ufv.br//handle/123456789/24297
Tipo: Artigo
Título: Genotypic and pathogenic diversity of Colletotrichum sublineola isolates from Sorghum (Sorghum bicolor) and Johnsongrass (S. halepense) in the southeastern United States
Autor(es): Mizubuti, E. S. G.
Xavier, K. V.
Queiroz, M. V.
Chopra, S.
Vaillancourt, L.
Abstract: Anthracnose caused by Colletotrichum sublineola is an important disease of cultivated sorghum (Sorghum bicolor) worldwide. Anthracnose is also common on the ubiquitous wild sorghum relative Johnsongrass (S. halepense). Analysis of repetitive molecular fingerprinting markers revealed that isolates of C. sublineola from both hosts in the southeastern United States were genotypically diverse, with relatively few haplotypes found in more than one location. With few exceptions, isolates recovered from S. bicolor belonged to a population that was genetically distinct from the population recovered from S. halepense. Twenty-three isolates from cultivated sorghum were all pathogenic to at least one of 13 heritage inbred lines of S. bicolor. In all, 4 of 10 isolates from S. halepense were also pathogenic to one or more of the lines, while the rest caused no disease in greenhouse assays. The four pathogenic isolates from S. halepense were less aggressive, on average, than isolates from S. bicolor, although the ranges overlapped. Pathogenicity tests involving 15 representative pathogenic isolates from S. bicolor and S. halepense on eight heritage inbred lines of S. bicolor identified 12 races. The combined results of this study demonstrated that C. sublineola comprises two separate host-associated subpopulations in the field, even though some isolates from S. halepense were able to cause disease on S. bicolor under ideal greenhouse conditions. Nonetheless, the apparent existence of infrequent cross-infection events in the field, indicated by molecular fingerprinting, suggests that Johnsongrass has the potential to serve as a refuge and an incubator for genetic diversity in C. sublineola, which can complicate efforts to develop and deploy resistant sweet sorghum varieties in the region.
Palavras-chave: Sorghum
Johnsongrass
Editor: Plant Disease
Tipo de Acesso: Open Access
URI: https://doi.org/10.1094/PDIS-04-18-0562-RE
http://www.locus.ufv.br/handle/123456789/24297
Data do documento: Nov-2018
Aparece nas coleções:Fitopatologia - Artigos

Arquivos associados a este item:
Arquivo Descrição TamanhoFormato 
artigo.pdftexto completo1,59 MBAdobe PDFVisualizar/Abrir


Os itens no repositório estão protegidos por copyright, com todos os direitos reservados, salvo quando é indicado o contrário.