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HOME > J. Microbiol > Volume 52(12); 2014 > Article
Research Support, Non-U.S. Gov't
Transformation of Inorganic P Fractions of Soil and Plant Growth Promotion by Phosphate-solubilizing Ability of Penicillium oxalicum I1
Mingbo Gong 1, Peng Du 2, Xue Liu 3, Changxiong Zhu 3
Journal of Microbiology 2014;52(12):1012-1019.
DOI: https://doi.org/10.1007/s12275-014-4406-4
Published online: November 3, 2014
1The Key Laboratory of Microbial Resources, Ministry of Agriculture / Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, 10081, P. R. China, 2Environmental Development Centre of Chinese Ministry of Environmental Protection, Beijing, 10029, P. R. China, 3Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing, 10081, P. R. China
Corresponding author:  Changxiong Zhu , Tel: +86-18910584260, 
Received: 11 July 2014   • Revised: 25 September 2014   • Accepted: 14 October 2014
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Abstract

The solubilization of tricalcium phosphate is often considered as the standard for screening of most phosphate-solubilizing microorganisms (PSMs). However, usually the effect of large-scale application of PSM on the promotion of crop growth varies. This study presents an efficient method for screening and testing phosphate-solubilizing fungus that enhance plant growth. A fungus Penicillium oxalicum I1 (PI1) was isolated and identified that had high ability of phosphate- solubilization and could utilize maize root exudates as sources, and propagate well in vitro and in soil. P-I1 excreted oxalic acid and reached 593.9 μg/ml, and the pH value was decreased from 6.90 to 1.65 in 26 h. The amount of P-I1 increased by 48-fold in 28 d and was maintained for 49 d in soil. PSM showed selectivity on the transformation of the different forms of phosphorus, a wide range of insoluble phosphates, such as Ca8H2(PO4)6·5H2O, AlPO4, FePO4, and Ca10(PO4)6(OH)2, were converted to soluble CaHPO4 in soil, and CaHPO4 was also inhibited from being converted into insoluble phosphate by P-I1. The Ca2-P content reached 27.11 μg/g soil on day 28 at 20°C, which increased by 110.32%, and plant growth promotion was tested and verified, the
results
showed that maize yield increased remarkably than control after inoculated P-I1, maize yield increased maximum by 14.47%. The data presented that P-I1 appear attractive for exploring their plant growth-promoting activity and potential field application.

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    Transformation of Inorganic P Fractions of Soil and Plant Growth Promotion by Phosphate-solubilizing Ability of Penicillium oxalicum I1
    J. Microbiol. 2014;52(12):1012-1019.   Published online November 3, 2014
    DOI: https://doi.org/10.1007/s12275-014-4406-4
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