27. KhizobiuTti 



The genus Rhizohium is composed of a group of bacteria (Fig. 

 29) which are able to invade the root tissues of specific leguminous 

 plants with the formation of characteristic nodules. The bacteria 



Fig. 29. a. From Vigna sinensis, 3I6nlO. Subpolar nionotrichous flagella. 



b. From Phaseolus lunatus, 3I6dlO. Subpolar monotrichous flagellation. 



c. From Phaseolus aureus, 3I6h7. Subpolar monotrichous flagellation. The 

 organism pictured appears to be made up of three cells with the flagellum 

 originating from the middle of the right end cell. 



d. From Phaseolus angularis, 3I6fl. Subpolar monotrichous flagellation. 



e. From Phaseolus aconitifolius, 3I6gl. Subpolar monotrichous flagellation. 



f. From Albizzia fulibrissen, lBoa2. Subpolar monotrichous flagellation. 



g. h, i, j. From Glycina hispida, 3Ilb59. g. The basic subpolar mono- 

 trichous flagellation of this strain, h. A curly flagellum in addition to the 

 normal flagellum. i. Four long curly flagella in addition to the normal flagel- 

 lum. j. Two curly flagella but no normal flagellum. 



k. From Ulex europaeus, 3C3al. Subpolar monotrichous flagellation. 



1. From Lupinus sp., 3C2k5. Subpolar nionotrichous flagellation. 



m, n, o. From Enjthrina itidica, 3I2bl. m. A subpolar flagellum of some- 

 what peculiar shape, n. Two curly flagella in addition to the normal flagellum 

 which is short and hooked in this strain, o. Two curly flagella only. 



p, q. From Pisum arvense. Peritrichous flagellation. The peculiar flagella 

 shown in q were common in this strain. Compare it with the illustration of 

 Agrobacteritim rhizogenes. 



r. From Trifolium. dubitim, 3D 1x3. Peritrichous flagellation. 



s. From Phaseolus vulgaris, 3I6clO(a). Peritrichous flagellation. 



t. From Phaseolus vulgaris, 3I6cl4. A curly and a straight flagellum. A 

 most unusual variant. 



u. From Medicago sativa, 3Doa30. Peritrichous flagellation. 



V. From Melilotus alba, 3Dohl3. Peritrichous flagellation. Note the straight 

 proximal parts of the flagella like those in q above. 



w. From Lotus amcricanus, 3Eobl. Peritrichous flagellation. 



X. From StropJwstylus paucifora, 3I6ml. Peritrichous flagellation. 



y. From Robinia pseudoacacia, 3F4b7. Peritrichous flagellation. 



z. From Caragana arborescens, 3F6g2. Peritrichous flagellation. 



aa. From Acacia linifolia, lAocl. Peritrichous flagellation. This organism 

 shows an unusually large number of flagella for a rhizobium. 



bb. From Wisteria frutescens, 3F33cl. Peritrichous flagella with strong 

 polar tendency. 



cc. From Lupinus densifiorus, 3C2nl. Peritrichous flagellation. All three 

 of the strains studied of this origin showed peritrichous flagellation. 



dd. From Phaseolus lunatus, 3I6d23. Very nice peritrichous flagella. 

 This is one of the two strains from Phaseolus lunatus which showed peri- 

 trichous flagella. The other nine strains studied showed typical subpolar 

 flagella. 



a-d. From E. Leifson, and L. W. Erdman, Antonie van Leeuwenhoek, J 

 Microbiol. Serol. 24, 97-110 (1958). 



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