Os03g0186600

The rice Os03g0186600 was reported as OsMDP1 in 2006 by researchers from the China.

Annotated Information

Gene Symbol

• Os03g0186600 <=> OsMDP1

Function

• OsMDP1 (Oryza sativa MADSdomain-containing protein 1). A partial cDNA encoding a MADS-box domain was identified via highthroughput screening of rice brassinolide-regulated genes, and the full-length cDNA was subsequently isolated via screening of a cDNA library constructed from rice materials at tillering stage.

Expression

• Expression pattern analyses indicated that OsMDP1 is transcribed mainly in vegetative tissues, including the mature leaf, coleoptile, root-elongation zone, culm internode, and especially the joint region between the leaf blade and sheath. Further studies revealed that transcription of OsMDP1 is stimulated by darkness and suppressed by brassinolide treatment.

'Figure 1. Gene structure and domain organization of the OsMDP1 gene.'

Evolution

• OsMDP1 deficiency resulted in shortened primary roots, elongated coleoptiles and enhanced lamina joint inclinations.
• Moreover, transgenic plants showed hypersensitivities to exogenous brassinolide in terms of lamina joint inclination and coleoptile elongation.
• OsMDP1 deficiency resulted in enhanced expression of OsXTR1, which encodes xyloglucan endotransglycosylase, the cell-wall loosening enzyme necessary for cell elongation, and modulated expressions of multiple genes involved in cell signalling and gene transcription, indicating the key negative regulatory role of OsMDP1 in BR signalling.

Labs working on this gene

• Key Laboratory of Photosynthesis and Environmental Molecular Physiology, Institute of Botany, Chinese Academy of Sciences,20 Nanxincun Road, 100093 Beijing, China,
• National Key Laboratory of Plant Molecular Genetics, Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Science (SiBS), Chinese Academy of Sciences, 300 Fenglin Road, 200032 Shanghai, China,
• Partner Group of Max-Planck-Institute of Molecular Plant Physiology (MPI-MP) on Plant Molecular Physiology and Signal Transduction, 300 Fenglin Road, 200032 Shanghai, China