AtSERK1 expression precedes and coincides with early somatic embryogenesis in Arabidopsis thaliana

J. Salaj, I.R. von Recklinghausen, V. Hecht, S.C. de Vries, J.H.N. Schel, A.A.M. van Lammeren

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Abstract

The Arabidopsis thaliana primordia timing (pt) mutant was transformed with an AtSERK1::GUS construct. Liquid cultures of this line were used to study the relationship between somatic embryogenesis and the expression of SOMATIC EMBRYOGENESIS RECEPTOR-LIKE KINASE (AtSERK1) as a marker for cells competent to form embryos. In order to search for the expression of AtSERK1::GUS during early stages of somatic embryogenesis, histochemical as well as immunochemical approaches were used for the detection of ß-glucuronidase (GUS). Four sites of AtSERK1 expression were found in the embryogenic cultures: in embryogenic callus, where primary somatic embryos developed; in the basal parts of primary somatic embryos; in the outer layers of cotyledons of primary somatic embryos where secondary embryos were formed; and in provascular and vascular strands of developing somatic embryos. The in vitro expression of AtSERK1::GUS coincides with embryogenic development up to the heart-shaped stage. Prior to the expression in embryos, AtSERK1 was expressed in single cells and small cell clusters, indicating that AtSERK1 indeed marks embryogenic competence. Its expression in (pro)
Original languageEnglish
Pages (from-to)709-714
JournalPlant Physiology and Biochemistry
Volume46
Issue number7
DOIs
Publication statusPublished - 2008

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Keywords

  • arabinogalactan proteins
  • developmental pathway
  • tissue cultures
  • callus-cultures
  • cell
  • gene
  • embryos
  • carrot
  • plants
  • methacrylate

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