Heading date and plant height are important determinants of yield in rice(Oryza sativa L.).In this study,we characterized a late heading,dwarf mutant known as lhdd10 selected following ethyl methane sulfonate(EMS)-treatment of ssp.indica cultivar 93-11.lhdd10 showed late heading,dwarfness and slightly darker green leaves than wild type 93-11 under long day and short day conditions.We isolated LHDD10 by map-based cloning; it encoded a putative FAD-linked oxidoreductase protein(a brassinosteroid biosynthetic gene)that localized to the nucleus.