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Light micrographs showing transverse views of the cambial zone and differentiating xylem after 84 d on 25 April 2012. In the heated seedling (A), there were many wide vessel elements (asterisks; A). Some vessel elements were found in the first layer from the previous year's xylem (arrowhead; A). In the heated portion of heated and disbudded seedlings (B), only a few narrow vessel elements were observed (asterisks; B). Scale bars = 200 μm.
