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Int. J. Mol. Sci. 2013, 14(3), 4545-4559; doi:10.3390/ijms14034545

Cesium Inhibits Plant Growth through Jasmonate Signaling in Arabidopsis thaliana

RIKEN Plant Science Center, 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa 230-0045, Japan
* Author to whom correspondence should be addressed.
Received: 25 December 2012 / Revised: 25 January 2013 / Accepted: 6 February 2013 / Published: 25 February 2013
(This article belongs to the Special Issue Signalling Molecules and Signal Transduction in Cells)
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It has been suggested that cesium is absorbed from the soil through potassium uptake machineries in plants; however, not much is known about perception mechanism and downstream response. Here, we report that the jasmonate pathway is required in plant response to cesium. Jasmonate biosynthesis mutant aos and jasmonate-insensitive mutant coi1-16 show clear resistance to root growth inhibition caused by cesium. However, the potassium and cesium contents in these mutants are comparable to wild-type plants, indicating that jasmonate biosynthesis and signaling are not involved in cesium uptake, but involved in cesium perception. Cesium induces expression of a high-affinity potassium transporter gene HAK5 and reduces potassium content in the plant body, suggesting a competitive nature of potassium and cesium uptake in plants. It has also been found that cesium-induced HAK5 expression is antagonized by exogenous application of methyl-jasmonate. Taken together, it has been indicated that cesium inhibits plant growth via induction of the jasmonate pathway and likely modifies potassium uptake machineries.
Keywords: cesium; potassium; Arabidopsis thaliana; jasmonate; HAK5 cesium; potassium; Arabidopsis thaliana; jasmonate; HAK5
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Adams, E.; Abdollahi, P.; Shin, R. Cesium Inhibits Plant Growth through Jasmonate Signaling in Arabidopsis thaliana. Int. J. Mol. Sci. 2013, 14, 4545-4559.

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