Isolation, molecular characterization and growth-promotion activities of a cold tolerant bacterium Pseudomonas sp. NARs9 (MTCC9002) from the Indian Himalayas
Biol. Res
;
42(3): 305-313, 2009. ilus, tab
Article
Dans Anglais
| LILACS
| ID: lil-531964
ABSTRACT
A bacterium that grows and expresses plant growth promotion traits at 4°C was isolated from the rhizospheric soil of Amaranth, cultivated at a high altitude location in the North Western Indian Himalayas. The isolate was Gram negative and the cells appeared as rods (2.91 x 0.71 μm in size). It grew at temperatures ranging from 4 to 30°C, with a growth optimum at 28°C. It exhibited tolerance to a wide pH range (5-10; optimum 8.0) and salt concentrations up to 6 percent (wt/vol). Although it was sensitive to Rifampicin (R 20 μg mi-1), Gentamicin (G 3 μg mi-1), and Streptomycin (S 5 μg mi-1), it showed resistance to higher concentrations of Ampicillin (A 500 μg mi-1), Penicillin (P 300 μg mi-1), Polymixin B sulphate (Pb 100 μg mi-1) and Chloramphenicol (C 200 μg mi-1). The 16S rRNA sequence analysis revealed maximum identity with Pseudomonas lurida. The bacterium produced indole Acetic Acid (IAA) and solubilizes phosphate at 4, 15 and 28°C. It also retained its ability to produce rhamnolipids and siderophores at 15°C. Seed bacterization with the isolate enhanced the germination, shoot and root lengths of thirty-day-old wheat seedlings by 19.2, 30.0 & 22.9 percent respectively, as compared to the un-inoculated controls.
Texte intégral:
Disponible
Indice:
LILAS (Amériques)
Sujet Principal:
Pseudomonas
/
Microbiologie du sol
/
Basse température
/
Amaranthus
Pays comme sujet:
Asie
langue:
Anglais
Texte intégral:
Biol. Res
Thème du journal:
Biologie
Année:
2009
Type:
Article
/
descriptif de projet
Pays d'affiliation:
Inde
Institution/Pays d'affiliation:
Indian Council of Agricultural Research/IN
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