Colonization of fiber cells by Colletotrichum graminicola in wounded maize stalks

C. Venard, L. Vaillancourt

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

Abstract

Colonization of wounded maize stalks by a wild-type strain of Colletotrichum graminicola was compared with colonization by a C. graminicola mutant that is avirulent on maize leaves, and by a wildtype strain of C. sublineolum that is normally a pathogen of sorghum but not maize. Local infection by all strains at the wound site resulted in formation of primary lesions consisting of disintegrated parenchyma cells beneath an intact rind and epidermis. However, subsequent rapid longitudinal expansion of the primary lesion occurred only in infections with the wild-type C. graminicola strain, and proceeded specifically through the fiber cells associated with the vascular bundles and the rind. Hyphae emerged from the fiber cells to produce discontinuous secondary lesions. There was no evidence that C. graminicola is a vascular wilt pathogen. Resistance of wounded cv. Jubilee maize stalks to the mutant strain of C. graminicola and to C. sublineolum was associated with restriction of colonization and spread of the pathogen through the fibers, as well as with the limitation of localized destruction of parenchyma cells at the wound site.

Original languageEnglish
Pages (from-to)438-447
Number of pages10
JournalPhytopathology
Volume97
Issue number4
DOIs
StatePublished - Apr 2007

Keywords

  • Corn stalk rot
  • Fungal pathogenicity
  • Green fluorescent protein
  • ZsGreen

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Plant Science

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