Padmanabhan U, Green B R
Biochim Biophys Acta. 1978 Nov 21;521(1):67-73. doi: 10.1016/0005-2787(78)90249-6.
The kinetic complexity of Acetabularia cliftonii chloroplast DNA is 1.52 +/- 0.26 . 10(9) daltons, compared to 0.2 .10(9) daltons for Chlamydomonas chloroplast DNA. There is an average of three genomes per chloroplast. The unusually large size of the Acetabularia genome may reflect the ancient evolutionary history of this organism.