Abstract
Adventitious roots develop in bean hypocotyl cuttings in four rows parallel to and between the four pairs of vascular bundles, in contrast to their irregular development in petiole and epicotyl cuttings where the distribution pattern of xylem bundles is also irregular. Auxin, applied acropetally or basipetally, increases the number of roots but does not alter the pattern of their emergence. Similarly, [2-l4CJIAA which is translocated mainly via the vascular bundles (but also laterally towards the cortex and pith) accumulates in the root-forming areas
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