JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2023, Vol. 47 ›› Issue (2): 42-48.doi: 10.12302/j.issn.1000-2006.202111032

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Family variation and selection of growth traits of eight-year-old Cupressus funebris in two sites

WANG Wenyue1(), ZHANG Zhen1,*(), JIN Guoqing1, SUN Linshan2, QIU Yongbin3, ZHOU Zhichun1, YANG Tao1   

  1. 1. Research Institute of Subtropical Forestry, Chinese Academy of Forestry, Zhejiang Provincial Key Laboratory of Tree Breeding, Hangzhou 311400, China
    2. Taizi Mountain Forest Farm Administration of Hubei Province, Jingshan 431822, China
    3. Kaihua Forest Farm of Zhejiang Province, Kaihua 324300, China
  • Received:2021-11-19 Revised:2022-05-12 Online:2023-03-30 Published:2023-03-28

Abstract:

【Objective】 The aims of this research is to reveal the genetic variation rules of Cupressus funebris growth traits, select the most suitable germplasm for the advanced genetic improvement, and select the most suitable families for regional promotion. 【Method】 For this study, eight-year-old half-sib families of C. funebris grown in the KH and TZS experimental sites were used, the genetic variations of growth traits were analyzed, and the breeding value and heritability were estimated. 【Result】 The genetic variation coefficients of C. funebris growth traits (tree height, diameter at breast height (DBH) and volume) ranged from 3.08%-13.93%, and the variation of volume was the greatest. The tree height, diameter at breast height, and volume of progeny families varied significantly among locations. The individual tree volume at TZS was 315.79% higher than that at KH, and the interaction between families and locations was significant. The tree height, DBH and volume have significant effects on the family. The range of heritability in the KH and TZS test sites was 0.42-0.61 and 0.58-0.74, respectively. Six complementary families were selected from the KH and TZS test sites based on the standard of breeding value per plant volume greater than 10% and 45% of CK, respectively, and the actual gains were 33.51% and 67.95%, respectively. Using the independent elimination method, 17 and 12 individual plus trees were screened at the KH and TZS sites respectively, and the genetic gains of volume were 41.38% and 40.92%, respectively. 【Conclusion】 The growth traits of the eight-year-old half-sib families of C. funebris have great potential for the genetic improvement, but the interaction effect between the family and the environment was significant. The genetic evaluation of the half-sib families was helpful for the re-selection of the parents for the establishment of the seed orchards and the thinning of the existing seed orchards. At the same time, the selected optimum germplasm can be used as breeding parents for high-order genetic improvement.

Key words: Cupressus funebris, complementary family, genetic variation, genetic gain

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