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Bulletin of Botanical Research ›› 2023, Vol. 43 ›› Issue (5): 690-699.doi: 10.7525/j.issn.1673-5102.2023.05.006

• Genetic and Breeding • Previous Articles     Next Articles

Selection of Excellent Families and Evaluation of Selection Method for Pulpwood Half-sibling Families of Betula platyphylla

Binghua CHEN1, Jie ZHANG1, Guifeng LIU1, Siting LI3, Yuanke GAO1, Huiyu LI1, Tianfang LI2()   

  1. 1.State Key Laboratory of Forest Genetics and Breeding,Northeast Forestry University,Harbin 150040
    2.Heilongjiang Forestry Research Institute,Harbin 150040
    3.Forestry Bureau of Yongji County,Yongji 132200
  • Received:2023-06-17 Online:2023-09-20 Published:2023-09-05
  • Contact: Tianfang LI E-mail:18646079568@126.com
  • About author:CHEN Binghua(1999—),male,postgraduate,major in tree genetic and improvement.
  • Supported by:
    National Key R&D Program of China(2021YFD2200105)


To provide the theoretical basis for genetic improvement of Betula platyphylla, the genetic variation of the growth and wood characters of B. platyphylla half-sibling families were studied, and the excellent pulp families were selected, and 32 seven-year-old half-sibling families were measured respectively, and the growth and wood characters of each family were analyzed by ANOVA, genetic parameters were calculated and general combining ability was estimated, multiple selection methods were used to select excellent families and evaluate excellent parents. The results showed that there were significant differences (P<0.01) in growth and wood characters among families, and the family heritability was 0.71-1.00, the heritability per plant was 2.0-3.0, the coefficient of variation ranged from 5.88% to 49.84%. There was a significantly and strongly positive correlation among DBH, tree height and volume(r:0.70-0.97), and fiber length to width ratio had a significantly and strongly positive correlation with the fiber length(r:0.69), while it had a significantly and strongly negative correlation with the fiber width(r:-0.76). The general combining ability was used to evaluate the excellent parents, and the general combining ability ranges of volume, basic density and fiber length were -0.001 1-0.001 0, -0.04-0.07 and -112.09-77.36, respectively. The maternal parents of A13, A12, A21 and A24 were selected as excellent parents, and three different selection methods, including Brekin multi-trait comprehensive analysis method, principal component analysis method and breeding value method, were used to select the excellent family. After comparing the advantages and disadvantages of the three methods, five excellent pulp families were selected, and the average genetic gain of volume and cellulose reached 12.97% and 3.40%, respectively. A12, A17, A23, A19, A1 were selected as the excellent pulpwood families, which provided material for further breeding of improved varieties of fast- growing B. platyphylla.

Key words: Betula platyphylla, half sibling family, pulp wood, selection method evaluation, evaluation of maternal parent

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