SEXUALITY IN BACTERIA 



105 





y^^\ / 



-' Sporocytopfia^a sp 



^^~^% . 



yi 



u 



^-®-* 



& 



F^* "Ix 



{Reproduced from Cold Spring Harbor Symposi, 



Fig. 44 



NUCLEAR CYCLES IN A VARIETY OF BACTERIA 



F-fusion and R-reduction, in each case. In Sporocytophaga and in non-sporing eubacteria 

 there is no diploid generation. In Bacillus there is a brief diploid (or polyploid) generation. 

 In the higher forms, a secondary, diploid mycelium. 



D: MICROCYST FORMATION IN MYXOBACTERIA 

 AND EUBACTERIA 



(2, 4, 5, 8, 10, 14, 16, 18, 19, 20, 24, 25, 26, 27) 



A more obvious sexual process accompanies the formation o( the resting 

 nucleus, in these bacteria as in most others. The resting nucleus is contained 

 in a microcyst which may be larger or smaller than the vegetative bacterium. 

 In eubacteria it is usually small, oval or spherical. In some myxobacteria it is 

 oblong, in others spherical. In cytophagas, spherical and very large, compared 

 'with the vegetative cell. 



