Arabidopsis thaliana Somatic Embryogenesis Receptor Kinase 1 protein is present in sporophytic and gametophytic cells and undergoes endocytosis

Protoplasma. 2005 Oct;226(1-2):55-65. doi: 10.1007/s00709-005-0111-9. Epub 2005 Oct 20.


Arabidopsis thaliana plants expressing AtSERK1 fused to yellow-fluorescent protein were generated. Fluorescence was detected predominantly at the cell periphery, most likely the plasma membrane, of cells in ovules, embryo sacs, anthers, and embryos and in seedlings. The AtSERK1 protein was detected in diverse cell types including the epidermis and the vascular bundles. In some cells, fluorescent receptors were seen in small vesicle-like compartments. After application of the fungal toxin Brefeldin A, the fluorescent receptors were rapidly internalized in the root meristem and root vascular tissue. We conclude that the AtSERK1 receptor functions in a common signalling pathway employed in both sporophytic and gametophytic cells.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Arabidopsis / genetics
  • Arabidopsis / growth & development*
  • Arabidopsis Proteins / genetics
  • Arabidopsis Proteins / metabolism*
  • Bacterial Proteins / genetics
  • Endocytosis / physiology*
  • Flowers / chemistry
  • Flowers / growth & development*
  • Luminescent Proteins / genetics
  • Microscopy, Confocal
  • Protein Kinases / analysis
  • Protein Kinases / genetics
  • Protein Kinases / metabolism*
  • Recombinant Proteins / genetics


  • Arabidopsis Proteins
  • Bacterial Proteins
  • Luminescent Proteins
  • Recombinant Proteins
  • yellow fluorescent protein, Bacteria
  • Protein Kinases
  • SERK1 protein, Arabidopsis