Abstract
A 5.1 kb segment of pea chloroplast DNA containing the upstream region of petA was sequenced. RNAs produced from this DNA were characterized. This region encodes putative genes for psbK, trnQ, zfpA, psaI, ORF231, and petA. These genes are all on the same reading strand except for psbK. The gene organization is somewhat different from that of tobacco, rice, and liverwort, which lack the psbK-trnQ genes in this region and contain ORF184/185. Northern blot and primer extension analysis show that the pea transcript covers the zfpA-psaI-ORF231-petA gene cluster and trnQ. These results indicated that the psbK-trnQ genes have been rearranged and a new transcription unit was formed.
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