New resistance genes in the Zea mays: exserohilum turcicum pathosystem
Genet. mol. biol
;
28(3): 435-439, July-Sept. 2005. ilus, tab
Article
in English
| LILACS
| ID: lil-416324
ABSTRACT
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).
Full text:
Available
Index:
LILACS (Americas)
Main subject:
Zea mays
Type of study:
Prognostic study
/
Qualitative research
Language:
English
Journal:
Genet. mol. biol
Journal subject:
Genetics
Year:
2005
Type:
Article
Affiliation country:
Brazil
Institution/Affiliation country:
Monsanto do Brasil Ltda/BR
/
Universidade Federal de Santa Catarina/BR
/
Universidade de Sao Paulo/BR
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