Plant Physiology Preview
Published on July 18, 2002; 10.1104/pp.006072
Received March 21, 2002
Accepted April 8, 2002
Two Novel Mitogen-Activated Protein Signaling Components, OsMEK1 and OsMAP1, Are Involved in a Moderate Low-Temperature Signaling Pathway in Rice
Jiang-Qi Wen , Kiyoharu Oono , and Ryozo Imai *
Winter Stress Laboratory, National Agricultural Research Center for Hokkaido Region, Hitsujigaoka 1, Toyohira-ku, Sapporo 062--8555, Japan
* Corresponding author; email: rzi{at}affrc.go.jp.
Rice (Oryza sativa) anther development is easily damaged by moderately low temperatures above 12°C. Subtractive screening of cDNA that accumulated in 12°C-treated anthers identified a cDNA clone, OsMEK1, encoding a protein with features characteristic of a mitogen-activated protein (MAP) kinase kinase. The putative OsMEK1 protein shows 92% identity to the maize (Zea mays) MEK homolog, ZmMEK1. OsMEK1 transcript levels were induced in rice anthers by 12°C treatment for 48 h. Similar OsMEK1 induction was observed in shoots and roots of seedlings that were treated at 12°C for up to 24 h. It is interesting that no induction of OsMEK1 transcripts was observed in 4°C-treated seedlings. In contrast, rice lip19, encoding a bZIP protein possibly involved in low temperature signal transduction, was not induced by 12°C treatment but was induced by 4°C treatment. Among the three MAP kinase homologs cloned, only OsMAP1 displayed similar 12°C-specific induction pattern as OsMEK1. A yeast two-hybrid system revealed that OsMEK1 interacts with OsMAP1, but not with OsMAP2 and OsMAP3, suggesting that OsMEK1 and OsMAP1 probably function in the same signaling pathway. An in-gel assay of protein kinase activity revealed that a protein kinase (approximately 43 kD), which preferentially uses myelin basic protein as a substrate, was activated by 12°C treatment but not by 4°C treatment. Taken together, these results lead us to conclude that at least two signaling pathways for low temperature stress exist in rice, and that a MAP kinase pathway with OsMEK1 and OsMAP1 components is possibly involved in the signaling for the higher range low-temperature stress.
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