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Bulletin of Botanical Research ›› 2017, Vol. 37 ›› Issue (2): 274-280.doi: 10.7525/j.issn.1673-5102.2017.02.016

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Growth Traits Variation Analysis and Family Selection of 3-year-old Various Ploidy Betula platyphylla

HUANG Hai-Jiao1, PENG Ru-Sheng2, LIU Yu1, JIANG Jing1   

  1. 1. State Key Laboratory of Tree Genetics and Breeding, Northeast Forestry University, Harbin 150040;
    2. Liaoning Province Institute of Poplar, Gaizhou 115200
  • Received:2016-08-30 Online:2017-03-15 Published:2017-03-11
  • Supported by:
    Forest Scientific Research in the Public Welfare(201204302)

Abstract: The growth traits analysis and family selection of tree progeny are important links in the tree breeding. To select excellent birch hybrid progeny, 21 Betula platyphylla families were employed to determine the height(H), diameter at breast height(DBH) and volume(V) of 3-year-old seedlings. Results of variance analysis showed that differences of all growth traits among different families were highly significant(P<0.01). Family heritability of H, DBH and V were all higher than 0.75, belonging to highly inheritance. The family 311-15 was excellent at H, DBH and V, and 9.09%, 11.25%, 40.46% higher than other families, respectively. Moreover, there were not significant differences between triploid families 311-9, 311-25, diploid families 211-7, 211-2, 211-3, 211-6, 211-1 and triploid family 311-15 at H, DBH and V. Based on the analysis of subordinate function, triploid families 311-15, 311-9 and diploid families 211-7, 211-2 were selected as excellent clones when the selection rate was 20.00%. The genetic gains of four clones on H, DBH and V were 5.24%, 7.18% and 19.72%, respectively. Taking the average volume+2S as standard, 52 superior individuals were screened out. These results provide a reference for the popularization of birch excellent family and superior individual selection at southwest of liaoning, also form an important basis for alterations of high generation triploid seed orchards.

Key words: Betula platyphylla, growth traits, excellent family, superior individual

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