The production strains of Aspergillis niger produce large quantities of citric acid because

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    the reason for overproduction by this strain is unclear.
     they have serious leaks in their cell membrane that cause the cells to lose citric acid.
     they are grown in an iron-starved environment, and produce citric acid as a chelator to scavenge iron.
     they contain mutations in the genes that control the TCA cycle.
asked May 16, 2012 in Microbiology by anonymous
    

1 Answer

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they are grown in an iron-starved environment, and produce citric acid as a chelator to scavenge iron.
answered May 17, 2012 by Bioshare ~Top Expert~ (34,070 points)

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