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• Gudimella, R
• Song, B
• Ratnam, W
• Harikrishna, J
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Int. J. Mol. Sci. 2012, 13(7), 9343-9362; doi:10.3390/ijms13079343

Article

Molecular Characterization and Comparative Sequence Analysis of Defense-Related Gene, Oryza rufipogon Receptor-Like Protein Kinase 1

Yee-Song Law ¹ , Ranganath Gudimella ¹ , Beng-Kah Song ² , Wickneswari Ratnam ³  and Jennifer Ann Harikrishna ^1,*

¹ Centre for Research in Biotechnology for Agriculture (CEBAR) and Institute of Biological Sciences, Faculty of Science, University of Malaya, Kuala Lumpur, 50603, Malaysia ² School of Science, Monash University Sunway Campus, Jalan Lagoon Selatan, Bandar Sunway, Selangor 46150, Malaysia ³ School of Environmental and Natural Resource Sciences, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, Bangi, Selangor 43600, Malaysia

* Author to whom correspondence should be addressed.

Received: 30 May 2012; in revised form: 6 July 2012 / Accepted: 6 July 2012 / Published: 24 July 2012

(This article belongs to the Special Issue Advances in Molecular Plant Biology)

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Abstract: Many of the plant leucine rich repeat receptor-like kinases (LRR-RLKs) have been found to regulate signaling during plant defense processes. In this study, we selected and sequenced an LRR-RLK gene, designated as Oryza rufipogon receptor-like protein kinase 1 (OrufRPK1), located within yield QTL yld1.1 from the wild rice Oryza rufipogon (accession IRGC105491). A 2055 bp coding region and two exons were identified. Southern blotting determined OrufRPK1 to be a single copy gene. Sequence comparison with cultivated rice orthologs (OsI219RPK1, OsI9311RPK1 and OsJNipponRPK1, respectively derived from O. sativa ssp. indica cv. MR219, O. sativa ssp. indica cv. 9311 and O. sativa ssp. japonica cv. Nipponbare) revealed the presence of 12 single nucleotide polymorphisms (SNPs) with five non-synonymous substitutions, and 23 insertion/deletion sites. The biological role of the OrufRPK1 as a defense related LRR-RLK is proposed on the basis of cDNA sequence characterization, domain subfamily classification, structural prediction of extra cellular domains, cluster analysis and comparative gene expression.

Keywords: Oryza rufipogon; RPK1; LRR domain; kinase domain; disease resistance

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