Rapid cessation of mitosis and elongation of root tip cells ofVicia Pabaas affected by boron deficiency

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Abstract
A lack of boron primarily effects root growth, i.e. the rapid cessation of root elongation (1). We have suggested previously that boron may have one of the essential roles in plant growth in relation to cell extension growth, by detail anatomical observations of boron-deficient root tips (2,3). However, Cohen and Albert (4) have recently described that boron deficiency had no inhibitory effect on cell elongation in the early stage of deficiency, and proposed that the cessation of root growth was due to the inhibition of cell division caused by the inhibition of DNA synthesis according to the results of autoradiographic study of intact squash root tips.