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Table 4 Organic acid production by fluorescent Pseudomonas during Mussoorie rock phosphate solubilization.

From: Organic acid production in vitro and plant growth promotion in maize under controlled environment by phosphate-solubilizing fluorescent Pseudomonas

    Organic acid (μg/ml)  
Strain P-liberated (μg/ml) Final pH Oxalic Gluconic 2-KGA Lactic Succinic Formic Citric Malic Total organic acids (μg/ml)
P. trivialis            
BIHB 728 11.0 ± 0.3 3.52 15.1 ± 1.4 8443.3 ± 6.0 ND 44.9 ± 1.7 ND ND ND ND 8503.3
BIHB 736 13.1 ± 0.1 3.52 15.6 ± 1.4 9314.3 ± 7.4 ND ND ND ND ND ND 9329.9
BIHB 745 5.8 ± 0.3 3.63 14.8 ± 1.4 9394.0 ± 8.3 ND ND ND 84.0 ± 3.1 ND 930.0 ± 4.2 10422.8
BIHB 747 12.0 ± 0.2 3.49 16.3 ± 0.7 10016.7 ± 4.4 ND 36.8 ± 2.0 ND 70.4 ± 2.7 ND ND 10140.2
BIHB 749 8.0 ± 0.04 3.59 15.8 ± 0.7 12027.0 ± 5.7 ND ND ND ND ND ND 12042.8
BIHB 750 4.8 ± 0.4 3.67 11.7 ± 0.9 8460.0 ± 5.8 ND ND ND ND ND 32.3 ± 2.1 8504.0
BIHB 757 9.0 ± 0.04 3.63 10.6 ± 1.0 9460.0 ± 5.5 ND 39.4 ± 2.8 ND ND ND ND 9510.0
BIHB 759 11.0 ± 0.2 3.52 16.7 ± 1.3 13854.0 ± 4.9 ND 39.7 ± 1.3 ND ND ND ND 13910.4
BIHB 763 12.9 ± 0.02 3.50 18.2 ± 0.5 13444.0 ± 5.5 ND ND ND 87.7 ± 3.0 ND ND 13549.9
BIHB 769 6.1 ± 0.4 3.65 16.4 ± 0.7 11633.7 ± 5.4 ND 40.5 ± 2.6 ND ND ND ND 11690.6
P. poae            
BIHB 730 4.0 ± 0.06 4.62 12.5 ± 1.3 7871.0 ± 8.5 19.9 ± 1.4 37.8 ± 2.1 ND ND ND ND 7941.2
BIHB 752 6.0 ± 0.03 3.62 19.6 ± 2.1 15727.0 ± 5.9 ND ND ND ND ND 293.0 ± 4.7 16039.6
BIHB 808 8.6 ± 0.6 3.53 15.3 ± 1.2 13749.7 ± 3.4 ND ND ND ND ND ND 13765.0
P. fluorescens
BIHB 740 3.0 ± 0.1 5.90 14.3 ± 0.9 8051.0 ± 6.1 468.0 ± 3.1 ND ND 114.4 ± 4.9 ND 183.2 ± 4.9 8830.9
Pseudomonas spp.
BIHB 751 2.4 ± 0.1 3.89 11.7 ± 0.4 7076.3 ± 4.6 126.3 ± 7.2 ND ND ND ND 2802.0 ± 4.7 10016.3
BIHB 756 12.7 ± 0.4 3.53 14.7 ± 1.2 9120.0 ± 6.4 153.0 ± 3.1 ND 142.0 ± 3.5 ND ND 264.0 ± 4.6 9693.7
BIHB 804 8.1 ± 0.3 3.55 39.3 ± 1.5 8997.0 ± 7.2 18.4 ± 0.9 39.6 ± 1.1 ND ND ND 34.1 ± 2.9 9128.4
BIHB 811 2.9 ± 0.03 4.00 42.0 ± 1.7 10007.0 ± 3.8 234.3 ± 2.0 50.8 ± 2.3 349.7 ± 2.7 ND 22.3 ± 2.2 36.1 ± 2.8 10742.2
BIHB 813 2.2 ± 0.4 4.05 14.2 ± 0.7 10396.0 ± 5.6 ND 40.5 ± 2.0 136.0 ± 2.1 ND ND ND 10586.7
Total organic acids (μg/ml) 334.8 197042.0 1019.9 370.0 627.7 356.5 22.3 4574.7 204347.9
  1. Values are the mean of three replicates ± standard error of the mean; ND = Not detected; 2-KGA = 2-ketogluconic acid.