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Genetic Variations in Pulpwood Qualities of Generation of Open-pollinated Hybrid Larch and Multi-Traits Selection

Author: DengJiFeng
Tutor: ZhangHanGuo
School: Northeast Forestry University
Course: Tree Genetics and Breeding
Keywords: Hybrid larch Open-pollinated families Pulpwood Wood properties Genetic variation Family Selection
CLC: S791.22
Type: Master's thesis
Year: 2011
Downloads: 46
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Abstract


In this paper, Mudanjiang City, Heilongjiang Province Linkou Castle Forest 17-year-old open-pollinated hybrid larch forest pedigree progeny test as an object, in order to foster the goal pulpwood on 23 growth and wood properties traits of genetic variation analysis, correlation analysis, composite index evaluation and selection. Groping monk intersystem genetic variation of wood property laws, research the correlation between traits and thus indirectly select, by means of multi-trait comprehensive selection equation, selected a group of growth and wood properties Jianyou pedigree for the purpose of producing forest planting Mudanjiang provide excellent breeding materials. The main results showed that: a genetic variation analysis showed that: growth and wood properties traits among families, families in both the presence of a large variation, except per unit area tracheid number, other traits latewood variation coefficients were higher than early wood; timber volume, late wood wall cavity ratio and coefficient of variation of resin ducts infer larger (44.6% -85.3%). Basic density, earlywood microfibril angle, tracheid infer the coefficient of variation is small (1.4% -8.1%), so the timber of Hybrid Larch Family focuses on sexual selection latewood. 2 Analysis of variance showed that: treatments mechanized fiber content, early wood and late wood microfibril angle, tracheid aspect ratio, radial diameter latewood, cell wall ratio, the wall cavity ratio, tracheid infer significant difference; volume, tube cell length, tangential diameter of earlywood and latewood tracheid number per unit area was significantly different, family heritability was 59.3% -92.7% for family level has a large potential for improving wood properties. 3 Correlation analysis showed: Volume and comprehensive fiber content into a very significant positive correlation with late wood microfibril angle, tangential diameter latewood tracheid wall to lumen ratio and infer a positive correlation with the aspect ratio and latewood tracheid tracheid number per unit area was negatively correlated; basic density and volume into a weak negative correlation with comprehensive fiber content into a significant negative correlation with late wood and late wood microfibril angle wall cavity ratio was negatively correlated with tracheid length and width ratio of latewood tracheid units plot number is positively correlated; Fully tracheid fiber content and aspect ratio and the number of latewood tracheids per unit area was negatively correlated; latewood tracheid wall cavity with aspect ratio into a highly significant negative correlation ; latewood tracheid microfibril angle and infer a significant positive correlation. Select the basic density of large pedigrees will be offset by volume growth was chosen based mostly negative factors. So focus on volume growth traits modified to take into account both the basic density reaches a certain level. 4 pairs of growth and a comprehensive evaluation of wood property elect growth and wood properties and other weight unconstrained exponential equation I7, stressed unconstrained growth modification exponential equation I8, stressed wood property improvement constrained exponential equation I93 an ideal multi-trait exponential equation . Suitable for pedigree Pulpwood Cultivation of Hing 7 × day 77-2, 77-3, and a long day at 5 × 3 × Hing 9. Inclusion rate of 30%, the pedigree of each trait genetic gain were: volume 34.7%, holocellulose content of 7.5%, late wood wall cavity ratio of 11.0%, late wood cell wall ratio of 6.2%, 4.5%, tracheid aspect ratio, latewood microfibril angle of 3.2%, 0.3%, tracheid infer. Hybrid larch breeding program pulpwood volume growth traits should be improved, taking into account for the improvement of wood property.

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CLC: > Agricultural Sciences > Forestry > Forest tree species > Coniferous > Larch
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