The stimulative effect of K+ on the activity of granule-bound starch synthetase was uniformly observed in the enzyme preparations obtained from the root, leaf and stem of sweet potato plants. The stimulation of K+ was most marked with the sweet potato enzyme, while the broad bean enzyme was also appreciably stimulated. The K+-effect was very small in the enzyme from rice, barley and taro plants.
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Murata et al. (1969) studied this question.