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Related Experiment Videos

Induced resistance responses in maize

S W Morris1, B Vernooij, S Titatarn

  • 1Seeds Biotechnology Research Unit, Novartis Inc., Research Triangle Park, NC 27709, USA.

Molecular Plant-Microbe Interactions : MPMI
|July 3, 1998
PubMed
Summary
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Chemicals can induce systemic acquired resistance (SAR) in maize, boosting plant defenses against diseases like downy mildew. This mimics natural plant immune responses and activates key defense genes, suggesting a shared ancient pathway in plants.

Area of Science:

  • Plant pathology
  • Molecular biology
  • Genetics

Background:

  • Systemic acquired resistance (SAR) is a plant defense mechanism conferring broad-spectrum disease resistance.
  • SAR is associated with the coordinated expression of specific SAR genes.
  • Chemicals can mimic SAR and induce resistance in plants.

Purpose of the Study:

  • To investigate the activity of chemical inducers of resistance in maize.
  • To determine if chemical induction activates defense genes in maize.
  • To compare induced resistance mechanisms in maize with those in dicots.

Main Methods:

  • Application of chemical inducers of resistance to maize.
  • Assessing maize resistance to downy mildew.
  • Analyzing the expression of maize PR-1 and PR-5 genes after induction and pathogen infection.

Related Experiment Videos

  • Examining defense gene expression and salicylic acid levels in monocot lesion mimic plants.

    • Main Results:

    • Chemical inducers were active in maize, increasing resistance to downy mildew.
    • PR-1 and PR-5 gene expression was activated by chemical induction and pathogen infection.
    • PR-1 and PR-5 genes were induced more rapidly and strongly in incompatible interactions.
    • Monocot lesion mimic plants showed defense gene expression and increased salicylic acid levels.

    Conclusions:

    • Maize exhibits chemically inducible disease resistance and PR-1/PR-5 gene expression, similar to dicots.
    • These findings suggest conserved aspects of induced resistance between monocots and dicots.
    • An ancient, shared plant-inducible defense pathway against pathogens likely exists in both monocots and dicots.