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International Journal of Soil Science
  Year: 2011 | Volume: 6 | Issue: 3 | Page No.: 176-187
DOI: 10.3923/ijss.2011.176.187
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Effect of Inoculation with Bacillus polymyxa Mutants on Growth, Phosphorous and Iron Uptake by Tomato (Lycopersicon esculentum L.) in Calcareous Soils

Hashem M. Mohamed and Ebaid M.A. Ibrahim

This investigation aimed at modifying the ability of phosphate-solubilizing bacteria, Bacillus polymyxa var. phosphaticum to improve plant growth of tomato plants. Bacillus polymyxa mutants selected after N-methyl-N′-nitro-N-nitrosoguanidin (NTG) treatments were evaluated for their efficiency in improving growth, P-uptake and Fe-uptake by tomato in greenhouse. Only five mutants out 1000 colonies were found to solubilize phosphates more than wild type strain on the basis of the solubilization index on Pikovskyaya's solid medium. Phosphate solubilization index of the five mutants M1, M2, M3, M4, M5 were 2.56, 2.42, 2.28, 2.49 and 2.31, respectively. The highest phosphate solubilization index was recorded by mutant strain M1 compared with the wild type strain (2.13). The results show that all tested strains produced; in their cultures; organic substances that chelated iron in the calcareous soil. In greenhouse experiment the results showed that inoculation of tomato cultivar Super marmand with wild strain or mutant M1 with or without the addition of rock phosphate had a significant effect on shoot and root dry weights, p-uptake and Fe-uptake in shoot compared with uninoculated treatment (control) or amended with rock phosphate alone. Similar results were recorded with Burchard cultivar but in general, the cultivar Super marmand was more responsive to wild type and mutant M1 inoculation than the cultivar Burchard. Application of both mutant and rock phosphate resulted in the highest availability of P and Fe in the soil, resulted in increases about 26% in P and 36% in Fe as compared to control.
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How to cite this article:

Hashem M. Mohamed and Ebaid M.A. Ibrahim, 2011. Effect of Inoculation with Bacillus polymyxa Mutants on Growth, Phosphorous and Iron Uptake by Tomato (Lycopersicon esculentum L.) in Calcareous Soils. International Journal of Soil Science, 6: 176-187.

DOI: 10.3923/ijss.2011.176.187






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