J Integr Plant Biol. ›› 2007, Vol. 49 ›› Issue (6): 898-907.DOI: 10.1111/j.1744-7909.2007.00512.x

Special Issue: Rice Genomics and Agriculture

• Signal Transduction • Previous Articles     Next Articles

Identification, Expression and Functional Analysis of a Receptor-like Cytoplasmic Kinase, OsRLCK1, in Rice

Zhaosheng Kong, Wenying Xu, Qun Li and Yongbiao Xue   

  • Published:2007-06-05

Abstract:

Pollination involves a series of complex cellular interactions and signal transduction events. Numerous reports have suggested a central role for protein kinases in pollen germination and pollen tube growth and a large number of receptor-like kinases have been detected exclusively in pollen in higher plants. However, few are well characterized, especially for the receptor-like cytoplasmic kinases. Here we report a receptor-like kinase gene, OsRLCK1, which belongs to the receptor-like cytoplasmic kinase VIII subfamily. Real-time quantitative polymerase chain reaction analysis and whole mount RNA in situ hybridization showed that OsRLCK1 is a pollen-specific gene and expressed only in the mature pollen. When expressed in the onion epidermal cells, the OsRLCK1-GFP fusion protein was diffused throughout the cell, indicating its cytoplasmic and nuclear localization. The Maltose Binding Protein-OsRLCK1 recombinant protein was found to be capable of autophosphorylation on threonine residue, showing that it encodes a functional kinase. These results suggest that OsRLCK1 is likely to play a role in a signaling pathway associated with pollen performance during pollination in rice.

Key words: pollination, receptor-like cytoplasmic kinase, rice (Oryza sativa).

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