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Possible mechanisms through which an increase in PPi leads to a reduction in starch accumulation in potato tubers that express a yeast invertase in the cytosol. The elevated PPi level may impede plastidial transport process (A); lead to an increase in plastidial Pi, which would inhibit the AGPase reaction (B); and/or an increase in plastidial PPi concentration may influence the rate of the AGPase reaction (C).
