Flavonols are a group of secondary metabolites that affect diverse cellular processes. They are considered putative negative regulators of the transport of the phytohormone auxin, by which they influence auxin distribution and concomitantly take part in the control of plant organ development. Flavonols are accumulating in a large number of glycosidic forms. Whether these have distinct functions and diverse cellular targets is not well understood. The rol1-2 mutant of Arabidopsis thaliana is characterized by a modified flavonol glycosylation profile that is inducing changes in auxin transport and growth defects in shoot tissues. To determine whether specific flavonol glycosides are responsible for these phenotypes, a suppressor screen was performed on the rol1-2 mutant, resulting in the identification of an allelic series of UGT89C1, a gene encoding a flavonol 7-O-rhamnosyltransferase. A detailed analysis revealed that interfering with flavonol rhamnosylation increases the concentration of auxin precursors and auxin metabolites, whereas auxin transport is not affected. This finding provides an additional level of complexity to the possible ways by which flavonols influence auxin distribution and suggests that flavonol glycosides play an important role in regulating plant development.

• MeSH
• Arabidopsis genetika   růst a vývoj   metabolismus   MeSH
• flavonoly metabolismus   MeSH
• glukosyltransferasy genetika   metabolismus   MeSH
• hexosyltransferasy chemie   genetika   metabolismus   MeSH
• homeostáza MeSH
• kyseliny indoloctové metabolismus   MeSH
• molekulární sekvence - údaje MeSH
• proteiny huseníčku chemie   genetika   metabolismus   MeSH
• rhamnosa metabolismus   MeSH
• sekvence aminokyselin MeSH
• sekvence nukleotidů MeSH
• vývoj rostlin MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH