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Bulletin of Botanical Research ›› 2021, Vol. 41 ›› Issue (4): 540-546.doi: 10.7525/j.issn.1673-5102.2021.04.009

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Analysis on the Growth Characters of Betula platyphylla in the Aerospace Mutation

Qing MA, Fang-Rui LI, Gui-Feng LIU, Hui-Yu LI   

  1. Northeast Forestry University State Key Laboratory of Forest Tree Genetics and Breeding,Harbin 150040
  • Received:2020-10-08 Online:2021-07-20 Published:2021-03-24
  • Contact: Hui-Yu LI
  • About author:MA Qing(1996—),male,master’s degree student,Mainly engaged in the research of forest genetics and breeding
  • Supported by:
    National Key Research and Development Project(2017YFD0600603);High-efficiency birch cultivation technology research


The growth characters of 15-year-old Space Mutation families of Betula platyphylla(HT-1, HT-2, HT-3, HT-4) and ground controls(CK-1, CK-2, CK-3, CK-4) were analyzed, and the growth characters of 2-year-old, 5-year-old and 15-year-old B. platyphylla were used to fit the growth curve. The results showed that the heights of 15-year-old HT-1 and HT-4 were significantly different from the ground control, respectively. The HT-1 height was higher than the ground control, while the HT-4 height was lower than the ground control. The heights of the other two families after Space mutagenesis were also higher than those of the control, but did not show a significant level. With the growing, some characters of the Space mutagenesis Birch families compared to the ground controls changed from significant differences to nonsignificant differences, but the overall trend of differences remained consistent with the seedling stage. The value of repeatabilities of the Space mutagenesis families and ground controls were high(>0.5), except the 98-3 family. The favorable mutation on height trait of the HT-1 was the highest, which was 7.31%. Using xˉ+S as the standard, 4 excellent individual plants were selected from HT-1, and the optimal individual height increased by 35.29% compared to the ground control family. The growth trend of tree height was predicted by fitting the tree height growth curve.

Key words: Betula platyphylla, aerospace mutation breeding, growth characters, equation fitting

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