Advance of the Primary-Secondary Vascular Transition Zone During Dormancy Induction of Populus Deltoides

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Abstract
During dormancy induction of Populus deltoides plants, the primary-secondary vascular transition zone advances only in those internodes subtending leaves that expanded prior to bud set. Therefore, most of the vascular cylinder remains primary in the final 2–3 very short internodes beneath the bud. Transitional xylem elements, resembling vascular tracheids, frequently occur in these internodes. During dormancy induction of Populus deltoides plants, the primary-secondary vascular transition zone advances only in those internodes subtending leaves that expanded prior to bud set. Therefore, most of the vascular cylinder remains primary in the final 2–3 very short internodes beneath the bud. Transitional xylem elements, resembling vascular tracheids, frequently occur in these internodes.

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