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A 505 bp cDNA was cloned from the leaves of rice (Oryza sativaL.) Shanyou 63 combination. DNA sequence analysis showed that it is a part of rice chloroplast genome. Its homology comparison with those known in GenBank found that it encodes 38 amino acid peptide deduced from psbL gene and 40 amino acid peptide deduced from psbJ gene in rice chloroplast PSⅡ. Northern hybridization showed that the cDNA was differentially displayed in hybrid F1 and its parental lines.