Gibberellic acid (GA3) significantly reduced the level of starch in green leaves of tobacco plants. The total α-amylase activity and the specific activities of α-amylase and invertase were increased by GA3 treatment. Hydrolysis of starch during flue-curing contributed greatly to the increased level of reducing sugars in cured leaf tissue; decreasing the level of starch in green leaves by GA3 effectively lowered the level of reducing sugars after curing.
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Lee et al. (1969) studied this question.
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