Detection of effects of nuclear genes on susceptibility to Helminthosporium maydis race T by a root cap cell bioassay for HMT-toxin

Martha C. Hawes, H. Wheeler

Research output: Contribution to journalArticle

3 Scopus citations


Previous attempts to detect effects of nuclear genes on susceptibility of corn to Helminthosporium maydis, race T, with several bioassays for the pathotoxin produced by this pathogen (HMT-toxin) have yielded conflicting results. Ten Texas male sterile corn lines, differing in susceptibility to H. maydis race T, were tested for sensitivity to HMT-toxin using a recently developed bioassay based on lethal effects on isolated root-cap cells. Susceptibility to H. maydis, race T, was found to be generally correlated with sensitivity to HMT-toxin. Preliminary results with two other phytotoxins suggest that this root cap cell bioassay should provide a rapid, accurate and economical method of testing agricultural chemicals or other agents for phytotoxicity.

Original languageEnglish (US)
Pages (from-to)163-168
Number of pages6
JournalPhysiological Plant Pathology
Issue number2
StatePublished - Mar 1984


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