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Micromorphological Characteristics of Frost Rings in the Secondary Xylem of Pinus radiata  

Lee, Kwang Ho (Dept. of Forest Products & Technology, Chonnam National University)
Kim, Jong Sik (Dept. of Forest Products & Technology, Chonnam National University)
Singh, Adya P. (Ensis)
Kim, Yoon Soo (Dept. of Forest Products & Technology, Chonnam National University)
Publication Information
Journal of the Korean Wood Science and Technology / v.35, no.2, 2007 , pp. 1-8 More about this Journal
Abstract
Frost ring formed in the secondary xylem of Pinus radiata was examined using various microscopic techniques. Cell walls in a frost ring were poorly developed, lacking in the proportion of wall components. Formation of secondary cell wall was imperfect and thickness of secondary wall was varied. Cytochemical examinations provided the evidence that the synthesis of structural polysaccharides and lignin was inhibited, resulting in the malformation of secondary cell walls. Judging by the highly irregular nature of the cell wall, it appears that cellulosic/hemicellulosic framework was affected and the template for lignification by frost.
Keywords
frost ring; Pinus radiata; secondary cell wall; cellulose; lignin; ultrastructure;
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