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Table 5 Organic acid production by fluorescent Pseudomonas during North Carolina 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 728 191.3 ± 1.0 3.70 14.7 ± 0.6 3810.0 ± 7.6 10.2 ± 1.0 ND ND ND ND ND 3834.9
BIHB 736 172.0 ± 0.3 3.72 9.1 ± 1.3 4672.3 ± 6.4 ND 42.7 ± 1.2 ND ND ND ND 4724.1
BIHB 745 168.2 ± 0.4 3.73 10.8 ± 0.5 3880.7 ± 5.2 10.1 ± 0.8 ND ND ND ND ND 3901.6
BIHB 747 173.0 ± 0.4 3.81 16.6 ± 1.0 6035.0 ± 4.2 11.0 ± 1.8 40.3 ± 2.9 ND ND ND ND 6102.9
BIHB 749 177.3 ± 0.6 3.73 17.1 ± 0.9 4587.0 ± 4.7 ND 42.7 ± 2.2 ND ND ND 113.2 ± 2.7 4760.0
BIHB 750 145.7 ± 1.2 3.88 10.3 ± 0.6 4395.3 ± 7.7 ND ND ND ND ND ND 4405.6
BIHB 757 175.0 ± 0.3 3.92 13.6 ± 2.3 4649.0 ± 5.5 13.3 ± 1.1 ND ND ND ND ND 4675.9
BIHB 759 178.0 ± 0.6 3.81 11.0 ± 1.4 5331.0 ± 6.1 ND ND ND ND ND ND 5342.0
BIHB 763 161.2 ± 0.2 3.80 11.5 ± 1.3 4362.0 ± 4.6 10.8 ± 1.0 ND ND ND ND ND 4384.3
BIHB 769 224.0 ± 0.7 3.55 10.8 ± 0.8 4448.0 ± 5.3 ND ND ND ND ND ND 4458.8
P. poae            
BIHB 730 163.8 ± 1.1 3.90 10.1 ± 1.2 3770.0 ± 6.4 ND ND ND ND ND ND 3780.1
BIHB 752 204.3 ± 0.7 3.72 12.7 ± 1.5 4947.0 ± 6.0 10.3 ± 1.0 ND ND ND 26.1 ± 2.0 ND 4996.1
BIHB 808 193.4 ± 0.7 3.65 11.5 ± 1.2 4420.3 ± 2.9 10.9 ± 0.8 ND 45.1 ± 4.3 ND ND ND 4442.7
P. fluorescens
BIHB 740 236.8 ± 0.6 3.48 9.8 ± 1.1 4762.7 ± 4.3 31.3 ± 2.0 ND 46.7 ± 3.2 59.3 ± 3.5 ND 104.8 ± 3.0 5014.6
Pseudomonas spp.
BIHB 751 123.3 ± 1.4 3.89 9.1 ± 1.1 3241.0 ± 2.6 22.3 ± 1.9 ND ND ND ND 415.0 ± 4.0 3687.4
BIHB 756 164.2 ± 0.8 3.82 11.3 ± 0.6 4975.0 ± 7.5 ND 41.7 ± 1.4 ND ND 29.5 ± 2.2 ND 5057.5
BIHB 804 161.5 ± 1.0 3.78 15.7 ± 1.2 4542.0 ± 5.3 10.5 ± 1.0 39.3 ± 2.0 ND ND ND 33.0 ± 1.2 4640.5
BIHB 811 173.0 ± 1.1 3.92 15.5 ± 0.8 2549.0 ± 5.9 32.7 ± 0.9 54.3 ± 2.0 75.1 ± 4.6 ND ND 265.0 ± 3.6 2991.6
BIHB 813 92.7 ± 1.2 4.07 8.9 ± 1.2 4633.3 ± 5.5 ND 38.8 ± 2.0 ND ND ND ND 4681.0
Total organic acids (μg/ml) 230.1 84010.6 173.4 299.8 121.8 59.3 55.6 931 85881.6
  1. Values are the mean of three replicates ± standard error of the mean; ND = Not detected; 2-KGA = 2-ketogluconic acid.