"There is an increasing interest in developing strategies to improve the effectiveness of RP as a direct source of Pi for plant growth in parts of the tropics endowed with local deposits of the material. One of the biotechnological strategies involves the use of phosphate- solubilizing microorganisms (PSM). Microbial dissolution of RP is brought about by a number of mechanisms including (i) release of organic acids, (ii) formation of complexes between organic anions and cations such as Al3+ and Ca2+ and (iii) excretion f protons due to NH4+ uptake. The participation of the last mechanism in the microbial solubilization of RP has not been fully investigated for fungal P solubilizers. Given the limited N supply of most soils the N applied either as NO3- or NH4+ fertilizers can control the extent of acid production by PSM, which is crucial in the efforts to evaluate the suitability of Mortierella sp. as an effective RP solubilizer in the rhizosphere or for its use in the biotechnological production of bio-acidulated RP.
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Last date updated on July, 2014