Plant Molecular Biology

, Volume 37, Issue 5, pp 819–827

Two novel MYB homologues with changed expression in late embryogenesis-defective Arabidopsis mutants

  • Victor Kirik
  • Kerstin Kölle
  • Simon Miséra
  • Helmut Bäumlein


Two novel MYB genes (ATMYBR1 and ATMYBR2) were isolated from Arabidopsis thaliana. Binding to a conserved MYB recognition sequence is demonstrated for the ATMYBR1 protein. The expression of both genes is affected by the fus3, lec1 and abi3 mutations causing pleiotropic defects during late embryogenesis and seed maturation including the loss of dormancy and desiccation tolerance. The strong increase of the transcript levels of both MYB genes during very late stages of embryogenesis typically found in wild type is missing in the mutants. Furthermore, the expression of both MYB genes is developmentally regulated in vegetative tissues. The highly conserved repeats (R2 and R3) of the DNA binding MYB domain of both proteins represent chimeric structures combining features typical of plant and animal derived proteins. This demonstrates the existence of a distinct subfamily of animal-like MYB factors in plant genomes.

late embryogenesis Arabidopsis thaliana fus3 lec1 abi3 mutants transcription factor MYB domain 


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Copyright information

© Kluwer Academic Publishers 1998

Authors and Affiliations

  • Victor Kirik
    • 1
  • Kerstin Kölle
    • 1
  • Simon Miséra
    • 1
  • Helmut Bäumlein
    • 1
  1. 1.Institute of Plant Genetics and Crop Plant Research, Corrensstrasse 3GaterslebenGermany

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