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首页> 外文学位 >THE INFLUENCE OF SELECTED WOOD ANATOMICAL FEATURES ON THE DEVELOPMENT OF DISCOLORATION AND DECAY IN WOUNDED TREES OF YELLOW-POPLAR.
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THE INFLUENCE OF SELECTED WOOD ANATOMICAL FEATURES ON THE DEVELOPMENT OF DISCOLORATION AND DECAY IN WOUNDED TREES OF YELLOW-POPLAR.

机译：精选木材解剖学特征对黄杨缠绕树木脱色和腐烂的影响。

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摘要

Yellow-poplar wound-associated wood contained a lower proportion of vessels and vessel multiples, smaller vessel diameter and an increased ray density and proportion of ray parenchyma cells as compared to normal wood. Also, fiber and vessel element length decreased in wound-associated wood while the proportion of fibers remained the same as that found in normal wood. All abnormal wood anatomical features in the wound associated wood graded towards those of normal wood with increasing distance from the wound area. Specific gravity of wound-associated wood was always greater than normal wood possibly due to the presence of thick-walled ray parenchyma and scleroid cells. The anatomical response to wounding was the same at each height within each tree. Although growth ring width was not significantly different among all trees studied, wounded-associated wood possessed wider growth rings than wood formed distal to the wound area.;Ray tissue index and the proportion of vessels are relatively simple to determine and use for indirect selection of yellow-poplar trees resistant to the spread of discoloration and decay. Since a large amount of family and tree-to-tree variation exists in the wood anatomical features studied and in the volume of discoloration and decay, it would be possible to incorporate resistance into a tree improvement program.;Increased resistance to the development of discoloration and decay in the wood present at the time of wounding has been associated with fewer vessels and vessel multiples in some yellow-poplar trees. Also, a yellow-poplar tree resistant to the spread of discoloration and decay from a wound contained more ray tissue than a less resistant tree. Ray tissue index is a measure of the amount of ray tissue present and incorporates ray density and the proportion of ray parenchyma. Ray tissue index accounted for a greater amount of the variation in the volume of discoloration and decay than either ray density or ray parenchyma cell content alone. A greater amount of ray tissue could indicate an increased area of ray parenchyma cell to vessel contact, and thus, allow for efficient deposition of fungitoxic compounds into vessels.
机译：与杨木相比，黄杨伤口相关木材包含的血管和血管倍数更低，血管直径更小，射线密度和射线实质细胞比例更高。同样，与伤口相关的木材中纤维和血管元素的长度减少，而纤维的比例保持与普通木材相同。与伤口相关的距离逐渐增加，与伤口相关的木材中所有异常的木材解剖特征都趋向于正常木材。与伤口相关的木材的比重总是比正常木材大，这可能是由于存在厚壁的射线实质和巩膜细胞。在每棵树的每个高度，对伤口的解剖反应都是相同的。尽管在所有研究的树木中生长轮宽度没有显着差异，但与伤口相关的木材比在伤口区域远端形成的木材具有更宽的生长轮。射线组织指数和血管比例相对容易确定，可用于间接选择黄杨树，耐变色和腐烂。由于研究的木材解剖结构特征以及变色和腐烂的数量中存在大量的家庭和树与树之间的差异，因此有可能将抗性纳入树木改良计划中。受伤时存在的木材腐烂和腐烂与一些黄杨树中较少的血管和血管倍数有关。而且，抗变色和来自伤口的腐烂扩散的黄杨树比抗性较低的树包含更多的射线组织。射线组织指数是对射线组织数量的度量，并结合了射线密度和射线实质的比例。与单独的射线密度或射线实质细胞含量相比，射线组织指数导致的变色和衰减量变化量更大。大量的射线组织可能表明射线薄壁组织细胞与血管接触的面积增加，因此使真菌毒性化合物有效地沉积在血管中。

著录项

  • 作者

    LOWERTS, GEORGE ALLAN.;

  • 作者单位

    North Carolina State University.;

  • 授予单位 North Carolina State University.;
  • 学科 Agriculture Forestry and Wildlife.
  • 学位 Ph.D.
  • 年度 1983
  • 页码 91 p.
  • 总页数 91
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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