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THE PLANT CELL, Vol 9, Issue 11 2093-2100, Copyright © 1997 by American Society of Plant Biologists
A Developmentally Regulated MAP Kinase Activated by Hydration in Tobacco Pollen
C. Wilson, V. Voronin, A. Touraev, O. Vicente and E. Heberle-Bors
Institute of Microbiology and Genetics, Vienna Biocenter, University of Vienna, Dr. Bohrgasse 9, A-1030 Vienna, Austria
A novel mitogen-activated protein (MAP) kinase signaling pathway has been
identified in tobacco. This pathway is developmentally regulated during
pollen maturation and is activated by hydration during pollen germination.
Analysis of different stages of pollen development showed that
transcriptional and translational induction of MAP kinase synthesis occurs
at the mid-bicellular stage of pollen maturation. However, the MAP kinase
is stored in an inactive form in the mature, dry pollen grain. Kinase
activation is very rapid after hydration of the dry pollen, peaking at ~5
min and decreasing thereafter. Immunoprecipitation of the kinase activity
by an anti-phosphotyrosine antibody is consistent with the activation of a
MAP kinase. The kinetics of activation suggest that the MAP kinase plays a
role in the activation of the pollen grain after hydration rather than in
pollen tube growth.
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