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Auxin biosynthesis in maize.

V Kriechbaumer1, W J Park, A Gierl

  • 1Lehrstuhl für Genetik, Technische Universität München, Am Hochanger 8, 85350 Freising, Germany.

Plant Biology (Stuttgart, Germany)
|June 30, 2006
PubMed
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Tryptophan-dependent pathways are the main route for indole-3-acetic acid (IAA) biosynthesis in maize kernels. Further research is needed to identify all genes involved in auxin production due to potential redundant pathways.

Area of Science:

  • Plant Biology
  • Biochemistry
  • Molecular Biology

Background:

  • The biosynthesis of the phytohormone indole-3-acetic acid (IAA), the primary auxin, involves complex tryptophan-dependent and -independent pathways.
  • Maize (Zea mays) serves as a valuable model for studying IAA biosynthesis due to significant accumulation of IAA conjugates in its endosperm.

Purpose of the Study:

  • To elucidate the predominant pathway for auxin biosynthesis in the maize kernel.
  • To investigate the role of specific nitrilases, ZmNIT1 and ZmNIT2, in IAA production.

Main Methods:

  • Precursor feeding experiments were conducted using a maize kernel culture system.
  • Retrobiosynthetic Nuclear Magnetic Resonance (NMR) analysis was employed to trace metabolic pathways.
  • Gene expression analysis of nitrilase genes (ZmNIT1, ZmNIT2) in maize seeds.

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Main Results:

  • NMR analysis strongly indicated that tryptophan-dependent synthesis is the primary route for auxin biosynthesis in maize kernels.
  • The nitrilase ZmNIT2 was found to efficiently hydrolyze indole-3-acetonitrile (IAN) to IAA, suggesting its involvement in auxin production.
  • ZmNIT1 and ZmNIT2 are expressed in maize seeds.

Conclusions:

  • Tryptophan-dependent pathways are the predominant route for IAA biosynthesis in maize kernels.
  • ZmNIT2 is a likely candidate enzyme involved in IAA synthesis via the indole-3-acetonitrile (IAN) route.
  • Redundant biosynthetic pathways may exist, necessitating the use of multiple mutants to fully characterize genes involved in maize auxin production.