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When cuttings from the stem of a Lombardy Poplar were suspended in a dark damp chamber for 5-6 days, the root primordia emerged normally. Exposure to continuous light, however, completely inhibited them. Exposure to light for 1% of the time, on a short, repeating, 6-minute cycle also resulted in...

Shapiro, S.
Plant Physiology, 1955, 30, Suppl., pp vii-ix