Abstract
A restriction endonuclease cleavage site map for the enzymes ClaI and BglII, and a partial map for SacI, has been constructed for the chloroplast genome of the moss Physcomitrella patens (Hedw.) BSG. The plastid chromosome contains approximately 122 kb organized into small (21 kb) and large (82 kb) single-copy regions separated by two copies of a repeat sequence (9.4 kb) oriented in an inverted arrangement. Genes for 17 proteins and 2 ribosomal RNAs have been mapped using heterologous probes from corn, spinach, pea, and petunia. The general order and arrangement of the moss chloroplast genes are similar to the consensus land plant genome typified by that of spinach, with two major exceptions. First, there is an inversion of approximately 20 kb, bordered internally by psbA and atpH, and also containing the genes atpF and atpA. Second, rpl2 and rps19 have been relocated to a different position within the large single-copy region, adjacent to the 20 kb inversion.
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