Agrobacterium tumefaciens AK-6b gene modulates phenolic compound metabolism in tobacco

Ivan Gális, Yasutaka Kakiuchi, Petr Šimek, Hiroetsu Wabiko

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)


The 6b gene (AK-6b) of Agrobacterium tumefaciens AKE10 can substitute for the requirement of tobacco tissues for auxin and cytokinin to maintain callus growth in the culture medium. To identify compounds that might be involved in this process we analyzed phenolic metabolites in transgenic tobacco tissues expressing the AK-6b gene. On medium containing both cytokinin and auxin (SH medium), transgenic calli accumulated higher levels of chlorogenic acid, caffeoyl putrescine, rutin and kaempferol-3-rutinoside, than did wild-type tissues. In contrast, the levels of scopolin and its aglycone, scopoletin were lower in transgenic tissues. On hormone-free medium, these phenolic compounds showed neither significant levels nor an apparent relationship with AK-6b transcript levels, except for the negatively correlated levels of scopoletin and AK-6b transcripts. Apparently, the AK-6b gene acts, in SH medium, to redirect the synthesis of scopolin in tobacco tissues towards the preferential synthesis of caffeic acid derivatives and flavonoids.

Original languageEnglish
Pages (from-to)169-179
Number of pages11
Issue number2
Publication statusPublished - Jan 2004
Externally publishedYes


  • Caffeoylputrescine
  • Chlorogenic acid
  • Flavonoids
  • Kaempferol-3-rutinoside
  • Metabolism
  • Nicotiana tabacum
  • Phenylpropanoids
  • Rutin
  • Scopoletin
  • Scopolin
  • Solanaceae
  • Tobacco

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Plant Science
  • Horticulture


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