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Nitrite reductase gene upregulated during conidiation is involved in macroconidium formation in Fusarium oxysporum

Y Iida1, T Kurata, Y Harimoto

  • 1Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya, Japan.

Phytopathology
|October 24, 2008
PubMed

Insights

The nitrite reductase gene (FoNIIA) in Fusarium oxysporum is upregulated during spore formation and regulated by Ren1. FoNIIA plays a quantitative role in macroconidium production, impacting fungal development.

Area of Science:

  • Mycology
  • Molecular Biology
  • Biochemistry

Background:

  • Fusarium oxysporum produces microconidia, macroconidia, and chlamydospores.
  • The nitrite reductase gene (FoNIIA) in F. oxysporum is upregulated during conidiation.
  • FoNIIA is positively regulated by the transcription factor Ren1.

Purpose of the Study:

  • To analyze the function of FoNIIA in the conidiation process of F. oxysporum.
  • To investigate the role of Ren1 in regulating FoNIIA expression.
  • To determine the impact of FoNIIA on the production of asexual spores.

Main Methods:

  • Gene expression analysis of FoNIIA mRNA and protein levels during vegetative growth and conidiation.
  • Construction and analysis of REN1 disruption mutants.
  • Construction and analysis of FoNIIA disruption mutants.
  • Morphological and quantitative assessment of asexual spores (microconidia, macroconidia, chlamydospores) in wild-type and mutant strains.

Main Results:

  • FoNIIA expression (mRNA and protein) is significantly upregulated during conidiation compared to vegetative growth.
  • FoNIIA protein levels are reduced in REN1 disruption mutants, confirming Ren1's positive regulation.
  • FoNIIA disruption mutants produced morphologically normal microconidia and chlamydospores but significantly fewer macroconidia than the wild type.

Conclusions:

  • FoNIIA expression is upregulated during conidiation and positively regulated by Ren1 in F. oxysporum.
  • Nitrite reductase (FoNIIA) is essential for the quantitative production of macroconidia.
  • FoNIIA plays a role in both nitrate utilization and the developmental control of macroconidium formation in F. oxysporum.

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