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Population dynamics and screening of phosphate-solubilizing bacteria isolated fromtobacco (Nicotiana tabacum)-based cropping systems

Indian Agricultural Research Journals

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Title Population dynamics and screening of phosphate-solubilizing bacteria isolated fromtobacco (Nicotiana tabacum)-based cropping systems
 
Creator SUBHASHIN, D V
PADMAJA, K
 
Subject Nicotiana tabacum; Phosphate-solubilizing bacteria; Rhizosphere
 
Description A study was conducted during 2005–08 to isolate phosphate-solubilizing bacteria (PSB), their distribution pattern and population density from the rhizosphere of different field crops in tobacco (Nicotiana tabacum L.) growing soils.PSB isolates were assessed for phosphate-solubilizing capacity, production of growth regulators, phosphatase activity, pH changes and titrable acidity. There was a significant difference on the population density. It is found to be higher in the rhizosphere soils of Bengalgram (15.3 × 10⁵/g soil dry wt.), followed by redgram 14.1 × 10⁵ and least in the soils of rice 7.05 × 10⁵ and followed by maize 7.81 × 10⁵. The distribution pattern of PSB in the rhizosphere soils showed that the population levels decreased with the distance of soil sampling from the plants. Among the 10 strains, MP07 was the best in solubilizing phosphate (41.06 ppm/ml of culture filtrate) while SOP 12 was the least (19.90). A wide variation in the phosphate-solubilizing efficiency (51 to 72%) by the PSB isolates was observed. Further, all the isolates were able to secrete phytohormones like indole acetic acid (IAA) and acid phosphatase under in vitro condition. The isolate BePO6 produced higher of amount of IAA (44.36 ppm), followed by the strain MaPO3 and least in RPO5 (32.14 ppm). phosphatase activity showed that The strain BePO6 isolated from Bengalgram soil showed highest activity of phosphotase (38.2 μmoles/g/hr), followed by the strain MaPO3 isolated from maize soil (34.01 μmoles/g/hr) with the least activity by the strain RP05 (16.02 μmoles/g/hr) isolated from rice soil.
 
Publisher The Indian Journal of Agricultural Sciences
 
Contributor —
 
Date 2011-08-03
 
Type info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
 
Format application/pdf
 
Identifier http://epubs.icar.org.in/ejournal/index.php/IJAgS/article/view/8442
 
Source The Indian Journal of Agricultural Sciences; Vol 81, No 8 (2011)
0019-5022
 
Language eng
 
Relation http://epubs.icar.org.in/ejournal/index.php/IJAgS/article/view/8442/3401
 
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