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Activation of a putative MAP kinase in pollen is stimulated by the self‐incompatibility (SI) response
Author(s) -
Rudd Jason J.,
Osman Kim,
Franklin F.Christopher H.,
Franklin-Tong Verica E.
Publication year - 2003
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/s0014-5793(03)00710-5
Subject(s) - mapk/erk pathway , kinase , microbiology and biotechnology , protein kinase a , mitogen activated protein kinase , extracellular , mapk cascade , chemistry , receptor , pollen , papaver , biochemistry , biology , botany
Mitogen‐activated protein kinases (MAPKs) operate downstream of receptor–ligand interactions, playing a pivotal role in responses to extracellular signals. The self‐incompatibility (SI) response in Papaver rhoeas L. triggers a Ca 2+ ‐dependent signalling cascade resulting in inhibition of incompatible pollen. We have investigated the possible involvement of MAPKs in SI. We report the enhanced activation of a 56 kDa protein kinase (p56) in SI‐induced pollen and provide evidence that p56 has MAPK activity. This provides an important advance in our understanding of the SI response. We believe this is the first direct biochemical demonstration of activation of a MAPK during SI.