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A Study on the Genetic Variation in the Mechanical Properties of Single Tracheids of Japanese Larix

  • Received Date: 2011-10-16
  • The mechanical properties of single tracheids sampled from the juvenile wood of four 12-year-old Japanese Larix clones were examined by using tensile testing. The results revealed that the modulus of elasticity, tensile strength and breaking elongation of single tracheids of different clones were 11.44 GPa, 616.59 MPa and 6.54%, respectively, with the corresponding variation coefficient being 26.97%, 26.26% and 23.17%. The modulus of elasticity and breaking elongation of single tracheids were significantly different (at 0.01 level) among different clones of Japanese Larix, whereas the tensile strength showed insignificant difference. The modulus of elasticity, tensile strength and breaking elongation of single tracheids showed significant differences among different growth rings within a single tree. The repeatability of modulus of elasticity and breaking elongation of Japanese Larix clone were 0.79 and 0.57, respectively, indicating these two mechanical property indexes of tracheids being under moderate to strong genetic control. These results indicate that there are great potentials for early clone selection and genetic improvement in wood properties of Japanese Larix clones.
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A Study on the Genetic Variation in the Mechanical Properties of Single Tracheids of Japanese Larix

  • 1. Research Institute of Wood Industry, Chinese Academy of Forestry, Beijing 100091, China
  • 2. College of Material Science and Art Design, Inner Mongolia Agricultural University, Hohhot 010010, Inner Mongolia, China

Abstract: The mechanical properties of single tracheids sampled from the juvenile wood of four 12-year-old Japanese Larix clones were examined by using tensile testing. The results revealed that the modulus of elasticity, tensile strength and breaking elongation of single tracheids of different clones were 11.44 GPa, 616.59 MPa and 6.54%, respectively, with the corresponding variation coefficient being 26.97%, 26.26% and 23.17%. The modulus of elasticity and breaking elongation of single tracheids were significantly different (at 0.01 level) among different clones of Japanese Larix, whereas the tensile strength showed insignificant difference. The modulus of elasticity, tensile strength and breaking elongation of single tracheids showed significant differences among different growth rings within a single tree. The repeatability of modulus of elasticity and breaking elongation of Japanese Larix clone were 0.79 and 0.57, respectively, indicating these two mechanical property indexes of tracheids being under moderate to strong genetic control. These results indicate that there are great potentials for early clone selection and genetic improvement in wood properties of Japanese Larix clones.

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