Identification of Guanine-Nucleotide Binding Proteins in Plants: Structural Analysis and Evolutionary Comparison of the Ras-Related Ypt-Gene Family from Zea Mays

  • Klaus Palme
  • Thomas Diefenthal
  • Chris Sander
  • Martin Vingron
  • Jeff Schell


The development of plants is regulated by five types of hormones known as auxins, cytokinins, gibberellins, abscisic acid and ethylene (Phillips, 1971). Only little is known about the mechanisms of action of these hormones at the cellular and molecular level. Genetic analysis of mutants with increased resistance to growth inhibiting concentrations of hormones argues for the presence of receptor like functions in plants (King, 1988). Biochemical evidence suggests that the action of auxins may be mediated after binding to plasmalemma located receptors (for review see: Davies, 1988). However, our current picture on other elements in the plant cell, involved in the transmission of this signal to its final biological target, is only slowly emerging. Recent evidence strengthens the importance of the calcium signal in plant cells (Marme, 1983; Hepler & Wayne, 1985). Transient changes in cytoplasmic calcium levels coupled to external stimuli such as light and phytohormones can modulate numerous developmental responses (Hepler & Wayne, 1985).


Amino Acid Sequence Comparison Maize Protein Cytoplasmic Calcium Level Phosphorylation Dependent Signalling Extensive Amino Acid Sequence 
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Copyright information

© Springer Science+Business Media New York 1989

Authors and Affiliations

  • Klaus Palme
    • 1
  • Thomas Diefenthal
    • 1
  • Chris Sander
    • 2
  • Martin Vingron
    • 2
  • Jeff Schell
    • 1
  1. 1.Max Planck Institut für ZüchtungsforschungKöln 30Germany
  2. 2.European Molecular Biology LaboratoryHeidelbergGermany

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