New resistance genes in the Zea mays: exserohilum turcicum pathosystem

AUTOR(ES)

Ogliari, Juliana Bernardi, Guimarães, Marco Antônio, Geraldi, Isaías Olívio, Camargo, Luis Eduardo Aranha

FONTE

Genetics and Molecular Biology

DATA DE PUBLICAÇÃO

2005-09

RESUMO

The use of monogenic race-specific resistance is widespread for the control of maize (Zea mays L.) helminthosporiosis caused by Exserohilum turcicum. Inoculation of 18 Brazilian isolates of E. turcicum onto elite maize lines containing previously identified resistance genes and onto differential near-isogenic lines allowed the identification of new qualitative resistance genes. The inoculation of one selected isolate on differential near-isogenic lines, F1 generations and a BC1F1 population from the referred elite lines enabled the characterization of the resistance spectrum of three new genes, one dominant (HtP), one recessive (rt) and a third with non-identified genetic action. Three physiological races of the pathogen were also identified including two with new virulence factors capable of overcoming the resistance of one of the resistance genes identified here (rt).

Documentos Relacionados

• Chromosomal locations of the maize (Zea mays L.) HtP and rt genes that confer resistance to Exserohilum turcicum
• Mapping the mitochondrial DNA of Zea mays: Ribosomal gene localization
• Starch Synthesis Studies in Zea mays: II. Molecular Distribution of Radioactivity in Starch 12
• Popcorn germplasm resistance to fungal diseases caused by Exserohilum turcicum and Bipolaris maydis
• CHARACTERIZATION OF Exserohilum turcicum INFECTION SITES IN MAIZE GENOTYPES