Metabolism of maculosin, a host-specific phytotoxin produced by Alternaria alternata on spotted knapweed (Centaurea maculosa)

Sang Ho Park, Andrea Stierle, Gary A. Strobel

Research output: Contribution to journalArticlepeer-review

Abstract

Maculosin [the diketopiperazine, cyclo (l-Pro-l-Tyr)] is a host-specific phytotoxin produced by Alternaria alternata on spotted knapweed (Centaurea maculosa) [(Proc. Natn. Acad. Sci. U.S.A., 85, 8008-8011 (1988)]. The metabolism of maculosin was analysed after the application of [U-14C]maculosin on the detached leaves of spotted knapweed. The extracts of treated leaves as early as one day after [14C]maculosin treatment indicated that it was converted to at least three polar compounds. The neutral metabolite was purified and identified as a novel compound, maculosin β-O-glucoside. The glucoside is not phytotoxic towards spotted knapweed or any of several other plants tested.

Original languageEnglish
Pages (from-to)101-106
Number of pages6
JournalPhytochemistry
Volume35
Issue number1
DOIs
StatePublished - Dec 22 1993

Keywords

  • diketopiperazine
  • Maculosin
  • maculosin β-O-glucoside
  • phytotoxins
  • plant disease.
  • spotted knapweed

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