Targeted disruption of a melanin biosynthesis gene affects conidial development and UV tolerance in the Japanese pear pathotype of Alternaria alternata

Mol Plant Microbe Interact. 1999 Jan;12(1):59-63. doi: 10.1094/MPMI.1999.12.1.59.


Structural analysis of the BRM2 gene involved in melanin biosynthesis of the Japanese pear pathotype of Alternaria alternata suggested that this gene encodes 1,3,8-trihydroxynaphthalene reductase. Targeted disruption of the BRM2 gene did not affect pathogenicity, vegetative growth, or the number of conidia produced. Targeted disruption, however, did reduce conidial size and septal number, suggesting that melanin is associated with conidial development. The conidia of brm2 mutant transformants were more sensitive to UV light than those of the wild type, demonstrating that melanin confers UV tolerance.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Alternaria / genetics*
  • Alternaria / metabolism
  • Alternaria / pathogenicity
  • Amino Acid Sequence
  • Base Sequence
  • DNA Primers / genetics
  • Fruit / microbiology*
  • Gene Targeting
  • Genes, Fungal*
  • Melanins / biosynthesis*
  • Melanins / genetics*
  • Molecular Sequence Data
  • Radiation Tolerance / genetics
  • Sequence Homology, Amino Acid
  • Transformation, Genetic
  • Ultraviolet Rays


  • DNA Primers
  • Melanins

Associated data

  • GENBANK/AB015743