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Schematic model of regulation of ZjSWEET2.2 expression by sugar signals to mediate sugar transport. ZjSWEET2.2 exports photosynthates from leaves under normal conditions. Over-expression of ZjSWEET2.2 facilitates carbon fixation. Low sugar signals bind to inducing cis-elements in promoter of ZjSWEET2.2 to activate its transcription. High sugar signals decreases the ZjSWEET2.2 expression and reduces the photosynthetic rate.
