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Histopathological changes in resistant (rhm) corn inoculated with Helminthosporium maydis race O

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Abstract

Seedlings of an inbred line of male-fertile corn possessing the gene rhm for resistance to Southern corn leaf blight were inoculated with conidia of Helminthosporium maydis race O. Histological observations at 1 day revealed that lesions were comprised of several dead mesophyll cells bordered by a pair of vascular bundles. By 4 days, lesions had only spread to a width of three vascular bundles. Ultrastructural observations revealed that although mesophyll cells degenerated at an early stage, bundle sheath and phloem cells remained intact even in 4-day-old lesions. It appears that the gene rhm imparts a resistance to bundle sheath and phloem cells against toxic substances released by the fungus. Addition key words: Zea mays L., ultrastructure, gene rhm, Southern corn leaf blight.

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Authors and Affiliations

  1. DEKALB Ag Research, Inc., Sycamore Road, USA

    D. R. Smith & R. Toth

  2. Department of Biological Sciences, Northern Illinois University, 60115, DeKalb, IL, USA

    D. R. Smith & R. Toth

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  1. D. R. Smith
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  2. R. Toth
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Smith, D.R., Toth, R. Histopathological changes in resistant (rhm) corn inoculated with Helminthosporium maydis race O. Mycopathologia 77, 83–88 (1982). https://doi.org/10.1007/BF00437388

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  • DOI: https://doi.org/10.1007/BF00437388

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