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Flavonols accumulate asymmetrically and affect auxin transport in Arabidopsis thaliana

  • Kuhn, Benjamin M. Institute of Plant Biology, University of Zurich, Switzerland
  • Geisler, Markus Institute of Plant Biology, University of Zurich, Switzerland - Department of Plant Biology, University of Fribourg, Switzerland
  • Bigler, Laurent Institute of Organic Chemistry, University of Zurich, Switzerland
  • Ringli, Christoph Institute of Plant Biology, University of Zurich, Switzerland
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    01.01.2011
Published in:
  • Plant Physiology. - 2011, vol. 156, no. 2, p. 585-595
English Flavonoids represent a class of secondary metabolites with diverse functions in plants including UV protection, pathogen defence, and interspecies communication. They are also known as modulators of signalling processes in plant and animal systems and therefore are considered to have beneficial effects as nutraceuticals. The rol1-2 (repressor of lrx1) mutation of Arabidopsis thaliana induces aberrant accumulation of flavonols and a cell-growth phenotype in the shoot. The hyponastic cotyledons, aberrant shape of pavement cells, and deformed trichomes in rol1-2 mutants are suppressed by blocking flavonoid biosynthesis, suggesting that the altered flavonol accumulation in these plants induces the shoot phenotype. Indeed, the identification of several tt (transparent testa ), myb, and fls1 (flavonol synthase1) alleles in a rol1-2 suppressor screen provides genetic evidence that flavonols interfere with shoot development in rol1-2 seedlings. The increased accumulation of auxin in rol1-2 seedlings appears to be induced by a flavonol-induced modification of auxin transport. Quantification of auxin export from mesophyll protoplasts revealed that NAA but not IAA transport is affected by the rol1-2 mutation. Inhibition of flavonol biosynthesis in rol1-2 fls1-3 restores NAA transport to wild-type levels, indicating a very specific mode of action of flavonols on the auxin transport machinery.
Faculty
Faculté des sciences et de médecine
Department
Département de Biologie
Language
  • English
Classification
Biological sciences
License
License undefined
Identifiers
Persistent URL
https://folia.unifr.ch/unifr/documents/301859
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