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Notes: The Pinning Method for Marking Xylem Growth in Hardwood Species

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The pinning method previously tested with softwoods was tested with poplar and black locust, in order to establish its reliability for marking xylem growth in hardwoods. Immature xylem cells in the primary wall zone enlarged and proliferated abnormally around the gap formed by pinning, thereby gradually closing the gap in this area. Meanwhile, the stripes of wall residue of immature cells which had been crushed and packed together on both flanks of the gap were broken by cambial divisions. The broken end of the stripe, which became increasingly distant from cambial initials, marked the site of cambial initials at the time of pinning. This broken end was always easily detectable because the stripe of wall residue remained otherwise unbroken. The site of secondary wall initiation at the time of pinning also was detectable because the gap initially remained open inward from that site and then filled with parenchyma cells. The present work suggested that the pinning method works as well or better with hardwoods, compared to previous observations with softwoods. Forest Sci. 30:548-554.

Keywords: Cambial initial; Populus euramericana; secondary wall initiation; wood formation; wound

Document Type: Miscellaneous

Affiliations: Professor, Research Section of Wood Biology, Wood Research Institute, Kyoto University, Uji, Kyoto 611, Japan

Publication date: June 1, 1984

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