FAMILY IV. PSEUDOMONADACEAE 



177 



Optimum temperature, 30° C. 



Optimum pH, 6.8 to 8.0. 



Source: Isolated many times from mot- 

 tled stripe of sugar cane in Louisiana. 



Habitat: Pathogenic on sugar cane. 

 Johnson's grass and sorghum 



58. Xanthomonas cannae (Bryan, 1921) 

 Savulescu, 1947. (Bacterium cannae Bryan, 

 Jour. Agr. Res., 21, 1921, 152; Sivulescu, 

 Anal. Acad. Romane, III, 22, 1947, 12.) 



can'nae. Gr. carina a reed; M.L. fem.n. 

 Canna generic name; M.L. gen. noun cannae 

 of Canna. 



Rods 0.5 to 0.7 by 1.0 to 2.0 microns. 

 Encapsulated. Motile with 1 to 3 polar 

 flagella. Gram-negative. 



Gelatin: Slow liquefaction. 



Agar slants: Growth filiform, white, 

 moist, with thin margins and granular 

 centers. 



Broth: Turbid; heavy sediment. 



Milk: Alkaline and clears. 



Nitrites produced from nitrates. 



Indole not produced. 



Hydrogen sulfide produced. 



No acid produced from carbohydrates. 



Temperature relations: Optimum, 35° C. 

 Minimum, 5° C. Maximum, 40° C. 



Aerobic. 



Source: Isolated from diseased canna 

 leaves collected in Washington, D. C. and 

 in Illinois. 



Habitat: Causes a disease in Canna 

 indica. 



59. Xanthomonas conjac (Uyeda, 

 1910) Burkholder, 1948. {Pseudomonas 

 conjac Uyeda, Bot. Mag. Tokyo, 24, 1910, 

 182; Burkholder, in Manual, 6th ed., 1948, 

 171.) 



con'jac. M.L. conjac the specific epithet 

 of Amorphophallus konjac, the host. 



Description from Elliott (Man. Bact. 

 Plant Path., 19,30, 121). 



Rods 0.75 to 1.0 by 1.5 microns. Motile 

 with 1 to 4 polar flagella. Presumably Gram- 

 negative although the original description 

 records this species as Gram-positive (Burk- 

 holder). 



Gelatin colonies: Circular to irregular, 

 light yellow. 



Broth : Pellicle formed. 



Milk: Coagulated. 

 Conjac: Liquefied. 

 Nitrites produced from nitrates. 

 Indole produced. 

 Hydrogen sulfide produced. 

 Gas from glucose. 

 Optimum temperature, 24° C. 

 Habitat: Pathogenic on Amorphophallus 

 konjac. 



60. Xanthomonas zingiber! (Uyeda, 

 1908) SSvulescu, 1947. (Eine neue species, 

 Uyeda, Cent. f. Bakt., II Abt., 17, 1907, 

 383; Pseudomonas zingiheri Uyeda, Rept. 

 Imp. Agr. Exp. Sta., Japan, No. 35, 1908, 

 114; Savulescu, Anal. Acad. Romane, III, 

 22, 1947, 13.) 



zin.gi'be.ri. Gr. indecl. zingiheri ginger. 



Description from Stapp (in Sorauer, 

 Handb. d. Pflanzenkrank., 2, 5 Aufl., 1928, 

 65). 



Rods 0.5 to 1.1 by 0.75 to 1.8 microns. 

 Non-motile at first, later a polar flagellum 

 develops. Gram-negative. 



Gelatin: Liquefied. 



Agar colonies: White. 



Milk: Coagulation and peptonization of 

 the casein. 



Nitrites produced from nitrates. 



Indole not produced. 



Hydrogen sulfide produced. 



No gas from glucose. 



Temperature relations: Optimum, 28° C. 

 Minimum, 5° C. Maximum, 40° C. 



Source: Isolated from ginger plant show- 

 ing a rot at the base of the sprouts. 



Habitat: Pathogenic on ginger. Zingiber 

 officinale. 



Addendum: Species inceriae sedis. Two 

 additional groups of yellow, polar-flagellate 

 species are described in this addendum al- 

 though they are not typical of the genus 

 Xanthomonas in all respects. The first is a 

 group of three species of plant pathogens. 

 One of these species is non-motile, but it ap- 

 pears to be closely related to the two polar- 

 flagellate species with which it is associated. 

 Plant pathologists have placed these three 

 species in Xanthomonas even though they do 

 not possess all of the characteristics of the 

 species in this genus senszi stricto. The 

 non-water-soluble, yellow pigment differs 



