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Wound Effects on Cytodifferentiation in Hardwood Xylem

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The wound effects on cytodifferentiation in hardwood xylem were studied by means of periodical observation of wound tissue formation after a pin insertion into the stem of poplar. The mitotic reactivation of ray parenchyma cells was similar to that in conifers. These ray cell derivatives easily invaded other cells creating the impression of septate fibres. Conspicuous abnormalities were found in the differentiation of those fusiform cells which were situated in the zone of xylem mother cells at the time of wounding and those originating from cambial initials for several days after wounding. In the former zone, fusiform cells were prevented from differentiating into vessel elements after dividing transversely several times in the zone adjacent to the injury ; fusiform cells in the area extending several millimetres longitudinally were variously modified morphologically after the frequent transverse divisions in the xylem mother cell zone: they showed various transitional patterns from vessel element-like through tracheid-like, and axial parenchyma-cell-like to fibre-like. These observations suggest that the direction of cytodifferentiation is determined in the cambial initials or the neighbouring xylem mother cells, and is controlled by certain substances, which may change in concentration through the wounding stimulus, bringing about the modification in cytodifferentiation. Wound reaction of hardwood (i .e., woody dicotyledons) was thus completely different from the regeneration of vascular system in injured herbaceous dicotyledons.


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