Histological study on tuberisation of potato (Solanum tuberosum L.) promoted by inhibitors of gibberellin biosynthesis

The application of antigibberellins to potato plant cultures results in an accelerated tuber appearance, caused by stimulation of pith-,and cortex-cell growth, particularly in the radial direction. Their growth considerably precedes the initiation of parenchymatous cell divisions, which are the first steps of naturally occurrring tuberisation, regulated by a different mechanism than the quantitative proportion of endogenous gibberellins and cytokinins. Part of the cortex cells change the orientation of their divisions to a periclinal one. The xylem parenchyma cells also undergo hypertrophy