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Maize ribosome-inactivating protein inhibits normal development of Aspergillus nidulans and Aspergillus flavus

K Nielsen1, G A Payne, R S Boston

  • 1Department of Botany, North Carolina State University, Raleigh 27695-7612, USA.

Molecular Plant-Microbe Interactions : MPMI
|February 24, 2001
PubMed

Insights

Maize kernel ribosome-inactivating protein 1 (RIP1) inhibits fungal growth in Aspergillus nidulans but causes branching in Aspergillus flavus. This suggests RIP1 may protect seeds from fungal invasion.

Area of Science:

  • Plant biochemistry
  • Mycology
  • Molecular biology

Background:

  • Maize kernel ribosome-inactivating protein 1 (RIP1) is abundant.
  • Fungal pathogens pose a threat to seed viability.
  • Understanding plant defense mechanisms is crucial.

Purpose of the Study:

  • To investigate the antifungal activity of maize RIP1 against Aspergillus species.
  • To determine the effects of RIP1 on fungal growth and development.
  • To elucidate the potential role of RIP1 in seed protection.

Main Methods:

  • Development of a microculture assay to monitor fungal growth.
  • Treatment of Aspergillus nidulans and Aspergillus flavus conidia with RIP1 and a mutant RIP1 protein.
  • Observation of hyphal proliferation, branching, and growth using microscopy and Congo red staining.

Main Results:

  • RIP1 significantly inhibited hyphal proliferation in Aspergillus nidulans.
  • A RIP1 mutant lacking enzymatic activity showed no effect on A. nidulans.
  • RIP1 treatment led to increased hyphal branching in Aspergillus flavus, with only one growing tip per conidium.
  • Both fungal species were affected at the postdivisional growth stage.

Conclusions:

  • Maize RIP1 exhibits differential antifungal activity against Aspergillus species.
  • The observed effects suggest a role for RIP1 in protecting maize kernels from fungal pathogens.
  • RIP1's inhibitory activity aligns with a biological function in seed defense against fungal invasion.

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