Flavanone 3-hydroxylase and Dihydroflavonol Oxygenase Activities in anthers of Tulipa: The Significance of the Tapetum Fraction in Flavonoid Metabolism

L. Beerhues, G. Forkmann, H. Schöpker, G. Stotz, R. Wiermann

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

Flavanone 3-hydroxylase and dihydroflavonol oxygenase activities were shown in anthers of Tulipa c.v. Apeldoorn. Both activities are tapetum-bound as demonstrated by a separation of the loculus material (i.e. anther contents) into a pollen and a tapetum fraction. Thus, the tapetum fraction has been shown to possess an almost complete sequence of enzyme reactions involved in the biosynthesis of flavonol glycosides. It is therefore evident that the anther tapetum plays an important role in phenylpropanoid metabolism on pollen. Investigations of phenylalanine ammonia-lyase and chalcone synthase activities in anthers of various systems indicated that the observations made for Tulipa c.v. Apeldoorn do not represent a unique but a widespread phenomenon.

Original languageEnglish
Pages (from-to)743-746
Number of pages4
JournalJournal of Plant Physiology
Volume133
Issue number6
DOIs
StatePublished - 1989
Externally publishedYes

Keywords

  • 2-amino-2-[hydroxymethyl]-1,3-propandiol
  • CHS
  • PAL
  • Tris
  • Tulipa
  • anthers
  • chalcone synthase
  • dihydroflavonol oxygenase
  • flavanone 3-hydroxylase
  • localization
  • phenylalanine ammonia-lyase
  • tapetum

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