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  • 1980-1984  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Histopathological changes in susceptible corn inoculated with Helminthosporium maydis race O (1982)
    Springer
    Mycopathologia 77 (1982), S. 75-82 
    Details
    ISSN: 1573-0832
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Seedlings of a susceptible inbred line of male-fertile corn were inoculated with conidia of Helminthosporium maydis race O. Histological and ultrastructural observations of mesophyll, bundle sheath and phloem were made over a period of 8 days. Histological observations at 1 day revealed that lesions were comprised of several dead mesophyll cells bordered by a pair of vascular bundles. By 3 days lesions had developed their characteristic appearance caused by mesophyll collapse and had increased to a width of 10–12 bundles. At the ultrastructural level, the first signs of mesophyll cell change were rupture of the tonoplast and swelling of the mitochondrial matrix followed by a disintegration of the cytoplasm and swelling of the chloroplast stroma. Following these changes the cytoplasm became filled with an electron dense material and the plasmalemma ruptured leaving only partial remnants of chloroplasts as recognizable organelles. All of these changes occurred by 1 day. Bundle sheath cells were more resistant and intact cells could be observed in 3-day-old lesions. Phloem showed signs of degeneration by 1 day with distortion of the sieve-tube element membranes and disintegration of the companion cell cytoplasm. By 4 days the phloem had disintegrated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00437387
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Histopathological changes in resistant (rhm) corn inoculated with Helminthosporium maydis race O (1982)
    Springer
    Mycopathologia 77 (1982), S. 83-88 
    Details
    ISSN: 1573-0832
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00437388
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
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