Differential effects of mannitol on gibberellin-regulated phospholipid synthesis and enzyme activities of the CDP-choline pathway in barley aleurone cells

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Abstract
When barley aleurone layers are treated with gibberellic acid (GA3) in the presence of increasing concentrations (0.2–0.8 M) of mannitol, the rate of 32Pi incorporation into phospholipids becomes progressively inhibited. Mannitol does not affect this process in aleurone layers not treated with GA3, nor does it appreciably inhibit GA3-effected increases of 32Pi incorporation into organic phosphates or the activities of the particulate enzymes of the CDP-choline pathway. These results suggest that some of the early events controlled by GA3 can be separated from later activities regulated by the hormone, including α-amylase synthesis.