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Volume : III, Issue : IV, May - 2013 MANAGEMENT OF REPLANT PROBLEM BY THE PRODUCTION OF PLANT GROWTH REGULATORS AND PHOSPHATE SOLUBILISING POTENTIAL OF FLUORESCENT PSEUDOMONAS SPP. ISOLATED FROM THE NORMAL AND REPLANT SITES OF APPLE AND PEAR DEEPSHIKHA THAKUR , MOHINDER KAUR AND VINEET SHYAM Published By : Laxmi Book Publication Abstract : Replant problem is a serious problem and common cause of poor growth and delayed cropping of trees
planted in old orchard sites. The possible solution to the replant problem is to introduce appropriate novel and
indigenous bioagent conferring maximum plant growth promotion activities so as to manage the replant problem of
horticultural crops. Pseudomonas species especially some members of fluorescent group are the most diverse and
versatile group of indigenous microflora that have the potential to produce plant growth regulators such as auxins,
cytokinins and gibberellins along with the Phosphate solubilising capacity. In the present study, in total 30
Fluorescent Pseudomomas spp. were isolated from soil samples collected from the rhizosphere of apple and pear in
normal and replant sites of Shimla district of Himachal Pradesh and were tested for Phosphate solubilising and Plant
growth regulators production. In qualitative method, maximum P solubilisation was found to be 442.85 PSE% and
by quantitative method, the phosphate solubilizing activity was recorded in the range of 1.7 μg/ml to 3560 μg/ml.
Maximum auxin, cytokinin and gibberellins production were 11.94 μg/ml, 179.48 μg/ml and 347.50 μg/ml
respectively. Keywords : Article : Cite This Article : DEEPSHIKHA THAKUR , MOHINDER KAUR AND VINEET SHYAM, (2013). MANAGEMENT OF REPLANT PROBLEM BY THE PRODUCTION OF PLANT GROWTH REGULATORS AND PHOSPHATE SOLUBILISING POTENTIAL OF FLUORESCENT PSEUDOMONAS SPP. ISOLATED FROM THE NORMAL AND REPLANT SITES OF APPLE AND PEAR. Indian Streams Research Journal, Vol. III, Issue. IV, http://oldisrj.lbp.world/UploadedData/2348.pdf References : - Ahmad N and Jha K K.1967. Solubilization of rock phosphate by microorganisms isolated from Bihar soils. Journal Gen Appl Microbiol 14: 89-95
- Anith K N, Tilak K VB R and Manomohandar T P.1999. Analysis of mutation affecting antifungal property of a fluorescent Pseudomonas sp. during cotton –Rhizoctonia interaction. Indian Phytopathology 52:366-369
- Arshad M and Frankenberger W T Jr. 1993. Microbial production of plant growth regulators. In: Soil Microbiology ecology Applications in agricultural and environmental management. F B metting. Jr Marcel Dekker. Incl. New York, pp.307-343
- Butak T (2006). Some optimal cultural parameters for Gibberellic acid biosynthesis by Pseudomonas species. 30: 81-85
- Camakci R., F. Donmez., A . Ayedin and F. Sahin. 2006. Growth promotion of plants by plant growth promoting rhizobacteria under greenhouse and two different field soil conditions. Soil Biology.38: 1482-1487
- Catska V, Vancura V, Hudska G. and Prikyl Z. 1982. Rhizosphere microorganisms in relation to the apple replant problem. Plant and Soil. 69: 187-197.
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