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Production and some characteristics of host specific toxins produced by several isolates of helminthosporium maydis race t


Production and some characteristics of host specific toxins produced by several isolates of helminthosporium maydis race t



Phytopathology 68(5): 707-714



ISSN/ISBN: 0031-949X

Isolates of H. maydis race T from several geographical locations were compared for ability to produce in culture a toxin that is selective against corn containing Texas male-sterile cytoplasm. The isolates did not differ significantly in virulence on corn [Zea mays], growth rate in culture, or rate at which toxin was produced in culture; small differences were detected in quantity of toxin produced in light vs. dark conditions. Toxin preparations were tested for stability at several pH values and were analyzed in several chromatographic systems; there were no apparent differences among preparations from the isolates. There were indications that more than 1 host-specific toxin could be found in partially purified preparations, but there was no evidence for differences in biological activity or in host-specific activity among different fractions. The instability of these materials in chromatographic systems did not permit reproducible qualitative analyses.

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Accession: 006190368

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Related references

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