AbstractThe light‐regulated chloroplastpsbA gene encoding the QBprotein has been cloned from rice(Oryza sativaL.), and the nucleotide sequence has been determined. Comparison of nucleotide sequences and derived amino acid sequences between species indicates a high degree of conservation of the primary structure. Comparison of promoter regions from the light‐inducible chloroplastpsbA,rbcL, andpsaA genes indicates conservation of the prokaryotic‐like promoter elements in all three genes and of a —21 box common only topsbA andrbcL promoter regions. No other putative regulatory signals were found based on nucleotide se