A Molecular Strategy for Isolation of the TOXl Allele from Cochliobolus Heterostrophus

  • B. G. Turgeon
  • L. Ciuffetti
  • W. Schafer
  • O. C. Yoder
Conference paper
Part of the NATO ASI Series book series (volume 27)

Abstract

The fungal maize pathogen Cochliobolus heterostrophus (anamorph: Helminthosporium maydis) exists as two pathotypes: race T, which produces T-toxin and race O, which does not. All race T isolates are highly virulent on maize with Texas male sterile cytoplasm; race O isolates are weakly virulent. On maize lines lacking T-cytoplasm, the virulence of races T and O is comparable. Crosses between isolates of races T and O have demonstrated that T-toxin production is determined by a single locus, Tox1. TOX1 progeny produce T-toxin and are highly virulent on T-cytoplasm maize; tox1 progeny do not produce T-toxin and are weakly virulent. Dominance of the TOX1 allele has been established by hetero-karyon analysis (Leach et al, 1982).

Keywords

Maize Aspergillus Hygromycin Timothy Cochliobolus 

References

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Copyright information

© Springer-Verlag Berlin Heidelberg 1989

Authors and Affiliations

  • B. G. Turgeon
    • 1
  • L. Ciuffetti
    • 1
  • W. Schafer
    • 1
  • O. C. Yoder
    • 1
  1. 1.Department of Plant PathologyCornell UniversityIthacaUSA

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