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The hydroxamic acid pathway.

A Gierl1, M Frey

  • 1Lehrstuhl für Genetik, Technische Universität München, Garching, Germany.

Novartis Foundation Symposium
|November 5, 1999
PubMed
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Plants use toxic secondary metabolites like DIBOA (2,4-dihydroxy-1,4-benzoxazin-3-one) as natural pesticides. A five-gene pathway in cereals synthesizes DIBOA, offering a potential strategy for enhancing crop disease resistance.

Area of Science:

  • Plant biochemistry
  • Chemical ecology
  • Genetics

Background:

  • Plant defense relies on toxic secondary metabolites acting as natural pesticides.
  • Cyclic hydroxamic acids, such as DIBOA and DIMBOA, are crucial for cereal chemical defense against pests and pathogens.

Purpose of the Study:

  • To elucidate the genetic basis and enzymatic pathway for DIBOA biosynthesis in cereals.
  • To explore the potential for engineering DIBOA biosynthesis in other plant species for improved disease resistance.

Main Methods:

  • Identification and characterization of five genes (Bx1-Bx5) clustered on chromosome four.
  • Enzymatic assays to determine the function of Bx1 (tryptophan synthase-like) and Bx2-Bx5 (cytochrome P450 monooxygenases).

Main Results:

Related Experiment Videos

  • A five-gene pathway, initiated by Bx1 and involving four cytochrome P450 enzymes (Bx2-Bx5), synthesizes DIBOA.
  • The pathway starts from a common plant metabolite, indole, and involves sequential hydroxylations.
  • Similar enzyme activities were observed in rye, suggesting conservation across grasses.

Conclusions:

  • The genetic and enzymatic pathway for DIBOA synthesis in cereals has been identified.
  • The conserved and relatively short DIBOA biosynthesis pathway presents an opportunity for genetic engineering to enhance disease resistance in non-host plants.