Phytohormones Production and Phosphate Solubilization Capacities of Fluorescent Pseudomonas sp. Isolated from Shimla Dist. of Himachal Pradesh

Ten bacterial isolates were obtained from the rhizosphere of sunflower crop grown in the semi-arid region of west Kanpur. Isolates were further characterized on the basis of morphological, biochemical and physiological characteristics suggesting them to be the member of group fluorescent pseudomonas. Isolates were further monitored for plant growth promoting traits including IAA, phosphate solubilization, siderophore, nitrogen fixation, HCN, chitinase and β-1-3 glucanase activity. Amongst all the isolates, PF17 displayed maximum PGP attributes hence it was selected for doing further in vivo pot study taking sunflower as a test crop. Seed treatment with fluorescent pseudomonas PF17 brought enhancement in root length, shoot length, dry weight and seed yield of sunflower crop in comparison to control (untreated seeds). Hence it might be concluded from the study that fluorescent pseudomonas PF17 contains large number of PGP attributes, and its application contributed in enhancement of sunflower growth leading to better yield. In addition, ability to enhance growth of sunflower with the help of biological means appears to be of great ecological and economic importance.

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A Disease of Salix alba var. coerulea caused by a Fluorescent Pseudomonas sp.

Plant Pathology ◽

10.1111/j.1365-3059.1978.tb01101.x ◽

1978 ◽

Vol 27 (3) ◽

pp. 144-145 ◽

Cited By ~ 3

Author(s):

T. Hunter ◽

K. G. Stott

Keyword(s):

Pseudomonas Sp ◽

Salix Alba ◽

Fluorescent Pseudomonas

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Biological control of damping-off of sugar-beet and cotton with Chaetomium globosum or a fluorescent Pseudomonas sp.

Canadian Journal of Microbiology ◽

10.1139/m88-104 ◽

1988 ◽

Vol 34 (5) ◽

pp. 631-637 ◽

Cited By ~ 25

Author(s):

D. Walther ◽

D. Gindrat

Keyword(s):

Biological Control ◽

Sugar Beet ◽

Seed Treatment ◽

Pythium Ultimum ◽

Chaetomium Globosum ◽

Pseudomonas Sp ◽

Damping Off ◽

Antifungal Metabolites ◽

Fluorescent Pseudomonas

Seed treatment with ascospores of Chaetomium globosum reduced damping-off of sugar-beet caused by seed-borne Phoma betae and soil-borne Pythium ultimum or Rhizoctonia solani in growth chamber experiments. Seed treatment with a fluorescent Pseudomonas sp. controlled Ph. betae and P. ultimum but not R. solani. Coating cotton seeds with ascospores controlled P. ultimum and R. solani damping-off. In some experiments, biological seed treatments were equally or more effective than seed treatment with captan. However, greater variability in disease control occurred with the antagonists than with captan. Fifty percent of freshly harvested ascospores of C. globosum germinated in 8 h on water agar. When ascospores were stored under air-dried conditions for 3 days to 2.5 years, germination increased to > 90%. Under same storage conditions, survival of Pseudomonas sp. was detected after 4 months. Antagonistic activities observed in vitro were hyphal coiling of C. globosum on R. solani, and mycostasis was induced by C. globosum or Pseudomonas sp. on agar and soil. The presumed cause of mycostasis is the diffusible antifungal metabolites which may also be involved in the biological control of damping-off.

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