Characterization of phosphate solublizing bacteria from potato field soil for plant growth promotion activities
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Date
2017
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Punjab Agricultural University, Ludhiana
Abstract
The present study was undertaken with a view to isolate phosphate
solubilizing bacteria (PSB) from potato field soil and evaluate their potential to
produce plant growth promoting metabolites and increase the crop yield. Phosphate
solubilizing bacteria (PSB) are frequently used as plant growth promoters and their
use as inoculants increases P uptake by the plant and enhances crop yield. A total of
40 PSB isolates were obtained from the rhizospheric soil of potato. The functional
potentialities of the isolates recorded were phosphate solubilization, siderophore and
Indole acetic acid (IAA) production. The maximum P-solubilization and IAA
production was recorded for isolate DS-20 (45.28 mg /100 ml and 80.12 µg/ml)
respectively. Isolate DS-5 exhibited maximum catechol type (78.8µg/ml) and
hydroxamate type (43.56 µg/ml) of siderophore production. A field experiment was
conducted to evaluate the tuber yield and quality characteristics in response to three
phosphorus levels (0, 75 and 100 kg/ha) and two PSB cultures (DS 20 and Reference
culture). The crop growth (sprout number, plant height, leaf area, chlorophyll content)
and yield traits (tuber yield, NPK contents of plant, tuber and soil) enhanced on PSB
inoculation as well as increased P-fertilizer application. Maximum tuber yield of 375
q-1 hectare was produced by Reference culture. Therefore, PSB inoculants may act as
potential P-biofertilizer for the sustainable potato cultivation system.
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