FAMILY IV. PSEUDOMONADACEAE 



137 



Starch slowly digested. 



Source: Barker made many cultures from 

 blighted pear blossoms. Doidge received a 

 culture from Barker. 



Habitat : Causes a blossom blight of pear. 



103. Pseudonionas betle (Ragunathan, 

 1928) Burkholder, 1948. {Bacterium betle 

 Ragunathan, Ann. Roy. Gard., Peradeniya, 

 Ceylon, 11, 1928, 51; Burkholder, in Man- 

 ual, 6th ed., 1948, 130.) 



bet'le. Malaj-an noun betle betel; M.L. 

 indeclin.noun betle. 



Rods, 0.5 by 1.5 to 2.5 microns, occurring 

 singly or in short chains. Non-motile. Gram- 

 negative. 



Green pigment formed in nutrient gelatin 

 and in broth. 



Gelatin: Liquefied. 



Bovril agar colonies: Honey-yellow, cir- 

 cular at first, later echinulate. Raised, 

 smooth and shiny. 



Bi-oth: Surface becomes cloud.y in 2 

 days. Pellicle. 



No gas from lactose, maltose or sucro.se. 



Starch is reduced. 



Aerobic. 



Source: Five cultures isolated from leaf 

 spots on the betel vine. 



Habitat: Pathogenic on the betel vine, 

 Piper betle. 



104. Pseudomonas gladioli Severini, 

 1913. (Annali d. Bot., Rome, 11, 1913, 420.) 



gla.di'o.li. L. gladiolus a small sword 

 lily; M.L. mas.n. Gladiolus generic name of 

 gladiolus; M.L. gen. noun gladioli of gladio- 

 lus. 



Rods 0.6 by 2.3 to 2.8 microns. Motile 

 with one or more polar flagella. Gram-nega- 

 tive. 



A pale yellow, water-soluble pigment 

 found, later orange. 



Gelatin colonies: Cream-colored, wart- 

 like. Rapid liquefaction. 



Milk: Coagulated and slowly peptonized. 



Nitrites not produced from nitrates. 



Indole not produced. 



No gas. 



Aerobic. 



Optimum temperature between 28° and 

 30° C. 



Habitat: Causes a corm rot of gladiolus 

 and other tubers. 



105. Pseudomonas mellea Johnson, 

 1923. (Jour. Agr. Res., 23, 1923, 489.) 



mel'le.a. L. adj. melleus pertaining to 

 honey. 



Rods 0.6 by 1.8 microns. Encapsulated. 

 Motile with 1 to 7 polar flagella. Gram- 

 negative. 



Green fluorescent pigment produced in 

 culture. 



Gelatin: Liquefied. 



Potato-glucose agar: Growth abundant, 

 smooth, glistening, viscid, honey-colored. 



Broth: Turbid in 24 hours. Pellicle. 



Milk: Alkaline; clears. 



Nitrites not produced from nitrates. 



Indole not produced. 



Hydrogen sulfide not produced. 



Starch hydrolysis feeble. 



Growth inhibited by 4 per cent salt. 



Temperature relations: Optimum be- 

 tween 26° and 28° C. Maximum, 36° C. 



Aerobic, facultative. 



Distinctive character: Differs from Pseu- 

 domonas pseudozoogloeae in that it produces 

 on tobacco a brown instead of a black spot 

 with a halo, is orange-yellow in culture, and 

 turns milk alkaline. 



Source: Isolated from brown rusty spots 

 on tobacco in Wisconsin. 



Habitat: Pathogenic on leaves of tobacco, 

 Nicotiana tobacum. 



106. Pseudomonas panacis (Nakata 

 and Takimoto, 1922) Dowson, 1943. {Bac- 

 terium panaxi Nakata and Takimoto, Bull. 

 Agr. Sta. Chosen, 5, 1922, 1 ; Dowson, Trans. 

 Brit. Mycol. Soc, S6, 1943, 10.) 



pa'na.cis. Gr. panax the plant heal-all; 

 M.L. neut.noun Panax a generic name; 

 M.L. gen. noun panacis of Panax. 



Description from Elliott (Bact. Plant 

 Pathogens, 1930, 173). 



Rods 0.5 by 1.3 to 1.5 microns. Chains. 

 Motile with 4 to 6 polar flagella. Gram- 

 negative. 



Green fluorescent pigment produced in 

 culture. 



Gelatin: Slight liquefaction. 



Agar colonies: White. 



Milk: Coagulated. 



No gas from sugars. 



