MAP kinase cascades in elicitor signal transduction |
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Authors: | Suzuki Kaoru |
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Institution: | (1) Gene Regulation Group, Institute of Molecular and Cell Biology, National Institute of Advanced Industrial Science and Technology (AIST), AIST Central 6, 1-1 Higashi, Tsukuba 305-8566, Japan Tel. +81-298-61-6071; Fax +81-298-61-6090 e-mail: kaoru-suzuki@aist.go.jp, JP |
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Abstract: | Protein kinases play important roles in elicitor signal transduction. In this article, I describe the current view of the
role of mitogen-activated protein kinase (MAPK) cascades in elicitor signal transduction of plant cells based on our own research
and recent developments in this field. In the past several years, it has become apparent that MAPK cascades play important
roles in elicitor signal transduction in plants. Our early studies demonstrated the identification of p47 MAPK in tobacco
as an elicitor-responsive protein kinase and possible involvement of p47 MAPK in elicitor signal transduction to induce defense
responses, including defense gene expression and hypersensitive cell death. However, the molecular identity of p47 MAPK is
still unclear. Recent important studies suggest that tobacco MAPK cascades that include SIPK, and/or WIPK, and NtMEK2, an
upstream kinase for both SIPK and WIPK, have a crucial function in induction of defense responses and hypersensitive cell
death. The orthologs of these protein kinases in Arabidopsis and alfalfa are also suggested to have similar functions. Furthermore, the identification of loss-of-function mutation in
Arabidopsis reveals a negative regulatory role for putative MAPK cascades in plant defense mechanisms.
Received: February 7, 2002 / Accepted: February 25, 2002 |
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Keywords: | Defense genes Elicitor Hypersensitive cell death MAP kinase cascade Signal transduction |
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