Abstract
The study of the cytokinesis inhibition by caffeine in meristem cells of onion root tips has shown the antagonism between calcium and/or magnesium and caffeine. Moreover, the influence of chelating agents (citrate and EDTA), which potentiate the caffeine effect on cytokinesis, also suggest an essential role for both cations in this process. We propose that caffeine interferes with plant cytokinesis involving some aspect of membrane recognition and/or fusion, where calcium and magnesium are essential requirements.
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