

y '*=^ V >j^ 



e ■ . ,f . , g . 



Fig. 30. a. Agrobacterium tumefaciens, Hildebrand strain. Peritrichous 

 flagella of rather short wavelength. The organisms pictured are unusually well 

 flagellated for Agrobacterium, species. 



b. A. tumefaciens, Starr TT-116. Peritrichous flagella of short wavelength 

 as in a. 



c. A. rhizogenes, NCIB 8196. Peritrichous flagellation very similar to that 

 of A. tumefaciens. The flagella show a tendency to originate at or near the 

 somatic pole, with the proximal part frequently straight as illustrated. This 

 picture closely resembles some taken of the peritrichously flagellated rhizobia. 



d. A.radiobacter, Starr TR-1. Peritrichous flagellation similar to that of 

 A. tumefaciens. 



e. A. pseudotsugae, Starr TP-102. Peritrichous flagella of relatively long 

 wavelength and very small amplitude quite different from A. tumefaciens. 



f. A. pseudotsugae, Starr TP-3. This strain was very poorly flagellated. 

 Most of the flagella were very short with indefinite curvature. 



g. Agrobacterium sp., Keller 72. This is one of several strains isolated from 

 water and nothing is known about its phytopathogenicity. The flagellation is 

 peritrichous with rather short flagella of distinctly greater wavelength than 

 that of A. tumefaciens. 



lengths correspond closely with those of the peritrichously flagel- 

 lated rhizobia. Agrobacterium pseudotsugae had an entirely dif- 

 ferent type of flagella with much greater wavelength ( 2.4 microns ) 

 and unusually small ampHtude. A culture isolated from water and 

 physiologically typical of Agrobacterium also had flagella of dis- 

 tinctly different type from A. tumefaciens. The phytopathogenicity 

 of this water strain is unknown. Two strains of Agrobacterium 

 rubi studied did not show either motiHty or flagella. ( See Fig. 30. ) 



75 



