Clonal variation and selection for growth and branch traits in young <i>Tectona grandis</i> plantations

PAN Dongkang; LUO Rongxia; YANG Baoguo; ZHOU Wenlong; CHEN Hai; HUANG Guihua; LIANG Kunnan; WANG Xianbang

doi:10.7671/j.issn.1001-411X.202312012

Journal of South China Agricultural University > 2024 > 45(4): 569-577. > DOI: 10.7671/j.issn.1001-411X.202312012

PAN Dongkang, LUO Rongxia, YANG Baoguo, et al. Clonal variation and selection for growth and branch traits in young Tectona grandis plantations[J]. Journal of South China Agricultural University, 2024, 45(4): 569-577. DOI: 10.7671/j.issn.1001-411X.202312012

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Clonal variation and selection for growth and branch traits in young Tectona grandis plantations

1.
Institute of Tropical Forestry, Chinese Academy of Forestry/Key Laboratory of Tropical Forestry, National Forestry and Grassland Administration, Guangzhou 510520, China
2.
Longyandong Forest Farm, Guangzhou 510520, China
3.
Tropical Forestry Experimental Center, Chinese Academy of Forestry Sciences, Pingxiang 532600, China

More Information

Received Date: December 11, 2023
Available Online: March 31, 2024
Published Date: April 14, 2024

Graphical Abstract

Abstract

Abstract

Objective
This study aims to investigate the genetic variation and correlation of the growth and branch traits of teak clones, and to comprehensively evaluate and select teak clones with rapid growth and excellent branch types.
Method
We investigated the growth and branch traits of 19 teak clones at 5-year old located in the Pingxiang City of Guangxi, and conducted repeatability estimation and phenotype correlation analysis. The comprehensive score of each clone was calculated through principal component analysis.
Result
There were significant differences (P<0.001) in tree height (H), diameter at breast height (DBH), and individual volume (V) among the teak clones, with coefficients of variation ranging from 28.2% to 38.8%, and repeatability ranging from 0.821 to 0.863. There were significant differences (P<0.001) in average branch angle (Ang), branch base diameter (BD), and branch length (BL) among different clones, with coefficients of variation ranging from 16.3% to 57.9%, and repeatablity ranging from 0.497 to 0.817. There were significant correlations (P<0.01 or P<0.05) between growth and branch traits. Using the principal component scores and a selection rate of 15%, three excellent teak clones (7765, 6601, 7703) were selected, with their comprehensive scores exceeding the control. Their average values for H, DBH and V were 5.68 m, 6.20 cm and 11.52 dm³ respectively, representing increases of 10.65%, 15.39% and 31.51% compared to the corresponding averages. After selection, the real gains in H, DBH and V were 9.07%, 10.69% and 30.20% respectively.
Conclusion
The growth and branch traits of 5-year-old teak clones exhibit rich genetic variation and high potential for improvement. The growth and branch traits are moderately to strongly controlled by genetic factors. Through comprehensive evaluation of the 5-year-old teak clones, three teak clones with rapid growth and excellent branch characteristics were selected. These clones can serve as high-quality genetic materials for teak clones and can be promoted in the southwest region of Guangxi.
- Tectona grandis,
- Clone,
- Branch character,
- Genetic variation,
- Comprehensive evaluation,
- Young tree stage

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References (33)

References

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