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Activities of key enzymes involved in sucrose to starch conversion of superior (SS) and inferior spikelets (IS) in NIL-GNP1TQ and Lemont during grain-filling period. Error bars indicate standard error (n = 3). The *, ** indicate significant difference between NIL-GNP1TQ and Lemont at P < 0.05, and P < 0.01, respectively.
