PJB-2021-596
Comprehensive selection and variation analysis of growth traits and wood color of Castanopsis hystrix half-sib families
Guangjin Liu, Hongyan Jia, Wenhui Shen and Jianmin Xu
Abstract
Castanopsis hystrix is an economically valuable tropical/subtropical timber species naturally distributed in various Asian regions. Studies on genetic variations affecting C. hystrix growth and wood color traits can increase the wood value. Trees in a 17-year-old forest of 32 C. hystrix half-sib families were analyzed to determine genetic variations in growth traits. Genetic variations affecting wood color (L* (lightness), chromaticity coordinate a*, and chromaticity coordinate b* were evaluated in tree cores. Annual growth rates of diameter at breast height, tree height, and stem volume were 1.27 cm, 1.08 m, and 0.02 m3, respectively, indicating high growth. The L*, a*, and b* values of C. hystrix heartwood were 47.55 ± 5.02, 15.50 ± 1.86, and 19.26 ± 2.35, respectively. Block was the decisive factor affecting variations in L* of heartwood and family main affected heartwood a* differentiation. Block × family interactions significantly affected stem volume, heartwood a*, and heartwood b* but to a lesser extent than the individual effects of family and environment. The family heritability of diameter at breast height, tree height, volume, heartwood a*, and heartwood b* were 0.53, 0.56, 0.76, 0.85, 0.68, respectively. The individual heritability of corresponding characters were 0.10、0.14、0.11、0.11、and 0.04. The wood color of heartwood and sapwood had no genetic correlation with growth characters, which indicated that the wood color of heartwood and sapwood was independent of growth traits. Six half-sib families with excellent growth and heartwood color were selected by using a multi-trait comprehensive evaluation method. The mean genetic gain of diameter at breast height, tree height, volume, heartwood a*, and heartwood b* were 12.093%, 7.166%, 39.054%, 10.265% and 7.235%. These results provide a theoretical basis for the evaluation and selection of families with superior growth and wood color traits for genetic improvement and directed breeding of C. hystrix
To Cite this article:
Liu, G., H. Jia, W. Shen and J. Xu. 2023. Comprehensive selection and variation analysis of growth traits and wood color of Castanopsis hystrix half-sib families. Pak. J. Bot., 55(3): DOI: http://dx.doi.org/10.30848/PJB2023-3(40)
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