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. 1997 Nov;9(11):2093–2100. doi: 10.1105/tpc.9.11.2093

A developmentally regulated MAP kinase activated by hydration in tobacco pollen.

C Wilson 1, V Voronin 1, A Touraev 1, O Vicente 1, E Heberle-Bors 1
PMCID: PMC157060  PMID: 9401129

Abstract

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 approximately 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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Selected References

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