174 



A. N. BELOZERSKY AND A. S. SPIRIN 



insufficient to permit any conclusions as to the variability of their DNA 

 composition. However, the data presented show a great difference in the 

 DNA composition between the representatives of two orders belonging to 

 the same class of Ascomycetes: Saccharomyces cerevisiae and Aspergillus 

 niger. Hence, it may seem that this group of microorganisms can also be 

 characterized by a great variety of DNA composition. This seems promis- 

 ing for the investigation of fungi from the viewpoint of the species speci- 

 ficity of DNA composition. 



The data obtained by Serenkov 148 on the DNA composition of some algae 

 are shown in Table VII. Unfortunately Low's 87 data could not be included 



TABLE VI 

 DNA Composition of Fungi 



Species 



Base proportions 

 (moles %) 



G A C 



A + T 



G + C 



Ref. 



Saccharomyces cerevisiae 

 Saccharomyces cerevisiae 

 Psalliota campestris 

 Aspergillus niger 



18.3 31.7 17.4 32.6 1.80 



18.7 31.3 17.1 32.9 1.79 



22.6 28.2 21.7 27.5 1.26 



25.1 25.0 25.0 24.9 1.00 



References 

 ° E. Vischer et al., J. Biol. Chem. 177, 429 (1949). 

 6 S. Zamenhof and E. Chargaff, J. Biol. Chem. 187, 1 (1950). 

 c S. O. Uryson, our laboratory (unpublished). 



TABLE VII 



DNA Composition of Algae* 



* Taken from G. P. Serenkov and M. V. Pakhomova, Doklady Vyschej Schkoiy No. 4, p. 156 (1959). 



