Variation analyses of growth traits in half-sib families of Korean pine and superior families selection

JIA Qingbin, LIU Geng, ZHAO Jiali, LI Kuiyou, SUN Wensheng

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2022, Vol. 46 ›› Issue (4) : 109-116.

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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 ›› 2022, Vol. 46 ›› Issue (4) : 109-116. DOI: 10.12302/j.issn.1000-2006.202107040

Variation analyses of growth traits in half-sib families of Korean pine and superior families selection

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Abstract

【Objective】 We analyzed the genetic variation of growth traits in half sib families of Korean pine (Pinus koraiensis), and select superior families to provide materials for genetic improvement of high generations of Korean pine. 【Method】 The progeny determination forest of half-sib families in Lushuihe National Forestry Improved Breeding Base was used for the experimental material. The differences in growth traits of 34 families, including one contrast, at different forest ages (18, 23 and 27-year old) were compared. The genetic parameters were estimated, and the phenotypic correlation and genetic correlation were analyzed. Based on the growth performance of families at each stand age, superior families were selected with volume and breeding value as the main indices. 【Result】 At different forest ages, the differences in height, diameter at breast height (DBH) and volume among families were highly significant. The difference in volume between families was mainly affected by genetic effects, and this effect was gradually strengthened with the growth of forest age. Height and DBH were mainly affected by genetic effects, genetic and environmental interaction effects, and crown width was mainly influenced by environmental effects. Among the four growth traits, there was less variations in the height and more variations in the volume. The height, DBH and volume were under strong genetic control, and the crown width was under medium and low genetic control. From 18 to 23 years of age, the heritability of height, DBH and volume showed a downward trend. From 23 to 27 years of age, the heritability changed slightly and tended to be stable. The variation trend for the selection response was consistent with that of the genetic variation coefficient, which showed that the selection response of height, DBH and volume decreased with the growth of forest age, and the variation range was stable after 23 years of age. The phenotypic correlation and genetic correlation among growth traits showed a positive correlation. The genetic correlation between the DBH and volume was highly significant. The genetic correlation between the height and volume decreased gradually with the increase in forest age. The genetic correlation between the crown width and volume gradually strengthened with forest age. Through the analysis and evaluation of the growth performance of all families in three forest age stages, two superior families were selected. The average volume of superior families was 25.84% higher than the contrast, 50.00% higher than the average value of all families, and 114.29% higher than the 1331 family which showed poor performance. 【Conclusion】 The actual gain in volume of superior families 1302 and 1046 was significant. The superior families can provide basic materials for high-generation breeding of Korean pine, and had positive significances for the genetic improvement of growth traits and directional cultivation of large-diameter wood of Korean pine in the future.

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Pinus koraiensis (Korean pine) / half-sib families / growth traits / genetic variation / family selection

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JIA Qingbin , LIU Geng , ZHAO Jiali , et al . Variation analyses of growth traits in half-sib families of Korean pine and superior families selection[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY. 2022, 46(4): 109-116 https://doi.org/10.12302/j.issn.1000-2006.202107040

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