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Molecular Plant 2008 1(5):732-750; doi:10.1093/mp/ssn047
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© The Author 2008. Published by the Molecular Plant Shanghai Editorial Office in association with Oxford University Press on behalf of CSPP and IPPE, SIBS, CAS.

The Receptor-Like Cytoplasmic Kinase (OsRLCK) Gene Family in Rice: Organization, Phylogenetic Relationship, and Expression during Development and Stress

Shubha Vij2, Jitender Giri2, Prasant Kumar Dansana, Sanjay Kapoor and Akhilesh K. Tyagi1

Interdisciplinary Centre for Plant Genomics and Department of Plant Molecular Biology, University of Delhi South Campus, Benito Juarez Road, New Delhi 110021, India

1 To whom correspondence should be addressed. E-mail akhilesh{at}genomeindia.org, fax 91-11-24115095, tel. 91–11–24113216.

Receptor-like cytoplasmic kinases (RLCKs) in plants belong to the super family of receptor-like kinases (RLKs). These proteins show homology to RLKs in kinase domain but lack the transmembrane domain. Some of the functionally characterized RLCKs from plants have been shown to play roles in development and stress responses. Previously, 149 and 187 RLCK encoding genes were identified from Arabidopsis and rice, respectively. By using HMM-based domain structure and phylogenetic relationships, we have identified 379 OsRLCKs from rice. OsRLCKs are distributed on all 12 chromosomes of rice and some members are located on duplicated chromosomal segments. Several OsRLCKs probably also undergo alternative splicing, some having evidence only in the form of gene models. To understand their possible functions, expression patterns during landmark stages of vegetative and reproductive development as well as abiotic and biotic stress using microarray and MPSS-based data were analyzed. Real-time PCR-based expression profiling for a selected few genes confirmed the outcome of microarray analysis. Differential expression patterns observed for majority of OsRLCKs during development and stress suggest their involvement in diverse functions in rice. Majority of the stress-responsive OsRLCKs were also found to be localized within mapped regions of abiotic stress QTLs. Outcome of this study would help in selecting organ/development stage specific OsRLCK genes/targets for functional validation studies.

Key Words: abiotic stress • biotic stress • genome-wide analysis • kinase • rice • RLCK

2 These authors contributed equally to the article.


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