"Excess positive charge in the cytoplasm may also trigger the release of organic anions in the cytoplasm in order to balance charges. In this study, it was detected that Mortierella sp. produced oxalic acid/oxalate. This organic acid/anion is commonly synthesized in the Krebâs cycle or from compounds formed from it to be used for normal metabolic functions and to maintain fungal growth. However, during periods of stress imposed by an excess of positive charges, these compounds could be used for the purpose of charge-balancing. This hypothesis may explain the lower dry mass of Mortierella sp. observed when the fungus was supplied with NH4 + compared to when it was supplied with NO3- as a sole source of N. It seems that the fungal cell was utilizing proton extrusion as well as organic anion synthesis concurrently.
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Last date updated on July, 2014