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Plant and Cell Physiology Advance Access published online on February 2, 2005
Plant and Cell Physiology, doi:10.1093/pcp/pci035
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Plant and Cell Physiology 2005 © The Japanese Society of Plant Physiologists (JSPP); all rights reserved.
Received August 17, 2004
Accepted December 12, 2004

Regular Paper

Genome-Wide Identification of the Rice Calcium-Dependent Protein Kinase and Its Closely Related Kinase Gene Families: Comprehensive Analysis of the CDPKS Gene Family in Rice

Takayuki Asano 1, Naoki Tanaka 1, Guangxiao Yang 1, Nagao Hayashi 1, and Setsuko Komatsu 1*

1 National Institute of Agrobiological Sciences, Kannondai 2-1-2, Tsukuba, Ibaraki, 305-8602, Japan

* To whom correspondence should be addressed.
Setsuko Komatsu, E-mail: skomatsu{at}affrc.go.jp


  Abstract

In plants, calcium acts as a universal second messenger in various signal transduction pathways. The plant-specific calcium-dependent protein kinases (CDPKs) play important roles regulating downstream components of calcium signaling. We conducted a genome-wide analysis of rice CDPKs and identified 29 CDPK genes and 8 closely related kinase genes, including five CDPK-related kinases (CRKs), one calcium and calmodulin dependent protein kinase (CCaMK), and two PEP carboxylase kinase-related kinases (PEPRKs). The mRNA splicing sites of the rice CDPKs, CRKs, and PEPRKs (but not OsCCaMK) are highly conserved, suggesting that these kinases are derived from a common ancestor. RNA gel blot analyses revealed that the majority of rice CDPK genes exhibited tissue-specific expression.Expression of OsCPK9was elevated in seedlings infected by rice blast, indicating that this gene plays an important role in signaling in response to rice blast treatment.Our genomic and bioinformatic analyses will provide an important foundation for further functional dissection of the rice CDPK gene family.

Keywords: Calcium-dependent protein kinase; gene expression; gene structure; Rice.
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