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Sequence Homology between Chloroplast DNAs from Several Higher Plants

Department of Biology, Wayne State University, Detroit, Michigan 48202

An estimate has been made of the amount of sequence homology present in the chloroplast DNA (ctDNA) of several higher plants by the technique of DNA-DNA hybridization. Approximately 85% of tomato, 60% of spinach, 45% of kale, and 15% of barley ctDNA sequences were found to hybridize with tobacco ctDNA under conditions in which maximum hybridization in homologous reactions reached 85%. All heteroduplexes contained significant amounts of sequence mismatch as indicated by a 3 to 9 C decrease in melting temperature as compared to homoduplex.

The data suggest that considerable sequence homology exists between the ctDNAs of these plants and that some sequences are held in common among all of the species tested.

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