By Jean Brachet
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More recent estimates on Acetabularia and several other chloroplasts put the DNA content within the range of bacterial DNA contents. Some of these are given in Table 2. However, Wells and Birnsteil (8) have shown by renaturation kinetics that lettuce chloroplast DNA consists of two components of 3 x 10° and 120 x 10° daltons. If lettuce is comparable to other higher plants, there are probably a number of these sequences per chloroplast, making the total DNA content much higher, but the actual genome size much more comparable to a viral than a bacte rial genome in terms of unique sequences.
Biochem. , 1_, 279. F. K. (1964) : Biochim. Biophys. Acta, 91, 289. de Vitry F. (1963) : Exptl. , 3 U 376. L. G. (1969) : Protoplasma, 67, 87. , Decroly M. and Brächet J. (1969): Proc. , 61, 843. Gibor M. and Izawa A. , 5£, 1164. Goffeau A. and Brächet J. (1965) : Biochim. Biophys. Acta,95^9 302. Hammerling J. (1953) : Intern. Rev. Cytol. , 2_, 475. Ingle J. , 43_, 1448. Janowski M. (1965) : Biochim. Biophys. Acta, 103, 399. 27 MICHEL JANOWSKI AND SILVANO BONOTTO Janowski M. , Bonotto S. and M.
17. Calculated using the values for number of chloroplasts/ alga given by Shephard (5). 18. L. Lateur, Rev. Algol. U 26 (1963). 19. T. Iwamura and S. Kuwashima, Biochim, Biophy. Acta 174, 330 (1969). 20. G. M. Eisenstadt, Ibid. 91, 477 (1964). 21. D. P. Williams, Biochim. Biophys. Acta 169, 265 (1968). 22. D. L. Loring, J. Biol. Chem. 228, 813 (1957). 23. J. Cairns, J. Mol. Biol. 6_, 208 (1963). 24. W. K. G. Carr, Arkiv. Mikrobiol. 65, 218 (1969). 44 BIOLOGY OF ACETABULARIA 25. C. Caldwell & C.