Study on genetic variation of half-sib family and superior families selection of Keteleeria fortunei

GAO Nan, TANG Xinghao, HE Wenguang, LIN Huazhang, WU Yishu, YU Mengyang, XIAO Xiangxi

Journal of Nanjing Forestry University (Natural Sciences Edition） ›› 2025, Vol. 49 ›› Issue (6) : 145-150.

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南京林业大学学报（自然科学版）
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Journal of Nanjing Forestry University (Natural Sciences Edition） ›› 2025, Vol. 49 ›› Issue (6) : 145-150. DOI: 10.12302/j.issn.1000-2006.202403001

Study on genetic variation of half-sib family and superior families selection of Keteleeria fortunei

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Abstract

【Objective】This study aims to evaluate the genetic variation in growth traits of 28 eight-year-old half-sib families of Keteleeria fortunei in Datian, Fujian Province, screen superior families, and estimate their genetic gains, thereby providing a basis for breeding and popularizing superior germplasm of K. fortunei.【Method】Key growth traits, including diameter at breast height (DBH), tree height, and individual volume, were measured in the progeny forest of 28 half-sib families. Genetic parameters (heritabilities) were calculated. Variance analysis was used to test the significance of trait differences among families, and systematic cluster analysis was employed to classify the families into the excellent, intermediate and poor types.【Result】There was abundant variation in growth traits among the families. The average DBH, tree height and individual volume were 8.45 cm, 6.21 m and 0.022 8 m3, with coefficient of variation ranges of 4.96%-43.03%, 1.93%-33.44% and 9.16%-97.70%, respectively. Variance analysis indicated extremely significant differences (P<0.01) in DBH, tree height and individual volume among families. The family heritabilities for tree height, DBH and individual volume were 0.690 1, 0.665 9 and 0.636 8, respectively, indicating moderate to strong genetic control of these traits. Systematic cluster analysis categorized the 28 families into three types: excellent, intermediate, and poor. The excellent-type families had average DBH, tree height and individual volume of 10.00 cm, 7.04 m and 0.0323 m3, which were 18.35%, 13.35% and 41.68% higher than the overall mean, coefficients of variation were 21.71%, 26.22% and 48.23% higher than the control population, respectively. Within the excellent-type families, families 7, 16, 4, 6 and 14 had average genetic gains exceeding 15% and were identified as superior families.【Conclusion】The growth traits of K. fortunei half-sib families exhibit rich genetic variation and extremely significant differences among families, indicating substantial potential for genetic improvement. Five superior families (7, 16, 4, 6 and 14) were selected based on heritability, cluster analysis and genetic gain evaluation. Their growth traits were significantly superior to the population mean and the control, with high genetic gains, making them suitable for declaration popularization and application as improved germplasm of K. fortunei.

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Keteleeria fortunei / half-sib family / genetic variation / genetic gain / improved variety breeding

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GAO Nan , TANG Xinghao , HE Wenguang , et al . Study on genetic variation of half-sib family and superior families selection of Keteleeria fortunei[J]. Journal of Nanjing Forestry University (Natural Sciences Edition）. 2025, 49(6): 145-150 https://doi.org/10.12302/j.issn.1000-2006.202403001

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