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Effect of Carbon Substrates on Rock Phosphate Solubilization by Bacteria from Composts and Macrofauna

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Relation http://oar.icrisat.org/5863/
http://dx.doi.org/10.1007/s00284-006-0004-y
 
Title Effect of Carbon Substrates on Rock Phosphate Solubilization by Bacteria from Composts and Macrofauna
 
Creator Hameeda, B
Reddy, Y H K
Rupela, O P
Kumar, G N
Reddy, G
 
Subject Fertilizer Appications
 
Description Five of the 207 isolates from different composts, farm waste compost (FWC), rice straw compost (RSC), Gliricidia vermicompost (GVC), and macrofauna, showed rock phosphate (RP) solubilization in buffered medium in plate culture. When tested in RP broth medium, all five strains, Enterobacter cloacae EB 27, Serratia marcescens EB 67, Serratia sp. EB 75, Pseudomonas sp. CDB 35, and Pseudomonas sp. BWB 21, showed gluconic acid production and solubilized RP. Based on cellulose-degrading and P-solubilizing ability, two strains were selected for further studies. In the presence of different carbon sources, both strains showed a drop in pH and solubilized RP. P released was maximum with glucose (1212 and 522 μmol) and minimum with cellobiose (455 and 306 μmol) by S. marcescens EB 67 and Pseudomonas sp. CDB 35, respectively. Glucose dehydrogenase (GDH) activity was 63 and 77% with galactose and 35 and 46% with cellobiose when compared to glucose (100%) by EB 67 and CDB 35, respectively. Both strains solubilized RP in the presence of different crop residues. EB 67 and CDB 35 showed maximum cellulase activity (0.027 units) in the presence of rice straw and a mixture of rice straw and root. P solubilized from RP in the presence of pigeonpea root was 134 and 140 μmol with EB 67 and CDB 35. Significantly, these bacteria isolated from composts and macrofauna solubilized rock phosphate in the presence of various pure carbon substrates and crop residues and their importance in soil/rhizosphere conditions is discussed
 
Publisher Springer Verlag
 
Date 2006
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
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Identifier http://oar.icrisat.org/5863/1/CurrentMicrobiology_53_4_298-302_2006.pdf
Hameeda, B and Reddy, Y H K and Rupela, O P and Kumar, G N and Reddy, G (2006) Effect of Carbon Substrates on Rock Phosphate Solubilization by Bacteria from Composts and Macrofauna. Current Microbiology, 53 (4). pp. 298-302. ISSN 0343-8651