标题：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
摘要：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.
