Present address: Department of Life Sciences, Graduate School of Arts and Sciences, University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan.
Various abiotic stresses rapidly activate Arabidopsis MAP kinases ATMPK4 and ATMPK6
Article first published online: 7 JUL 2008
The Plant Journal
Volume 24, Issue 5, pages 655–665, December 2000
How to Cite
Ichimura, K., Mizoguchi, T., Yoshida, R., Yuasa, T. and Shinozaki, K. (2000), Various abiotic stresses rapidly activate Arabidopsis MAP kinases ATMPK4 and ATMPK6. The Plant Journal, 24: 655–665. doi: 10.1046/j.1365-313x.2000.00913.x
- Issue published online: 7 JUL 2008
- Article first published online: 7 JUL 2008
- Received 11 July 2000; revised 15 September 2000; accepted 19 September 2000.
- MAP kinase;
- low temperature;
Mitogen-activated protein kinase (MAP kinase, MAPK) cascades play pivotal roles in signal transduction of extracellular stimuli, such as environmental stresses and growth regulators, in various organisms. Arabidopsis thaliana MAP kinases constitute a gene family, but stimulatory signals for each MAP kinase have not been elucidated. Here we show that environmental stresses such as low temperature, low humidity, hyper-osmolarity, touch and wounding induce rapid and transient activation of the Arabidopsis MAP kinases ATMPK4 and ATMPK6. Activation of ATMPK4 and ATMPK6 was associated with tyrosine phosphorylation but not with the amounts of mRNA or protein. Kinetics during activation differ between these two MAP kinases. These results suggest that ATMPK4 and ATMPK6 are involved in distinct signal transduction pathways responding to these environmental stresses.