Across-rotation genetic analysis and multitrait selection in a cloned cross of Eucalyptus urophylla × E. tereticornis
Clonal testing is crucial for estimating genetic parameters and selecting elite clones. However, few studies have tested clones over two or more rotations. In this study, a clonal trial of the sibs from a Eucalyptus urophylla × Eucalyptus tereticornis cross was used for genetic parameter analyses an...
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Frontiers Media S.A.
2025-06-01
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| Series: | Frontiers in Plant Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fpls.2025.1553819/full |
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| author | Jiahong Xu Jiahong Xu Jiahong Xu Mingming Zhou Mingming Zhou Qijie Weng Qijie Weng Mei Li Mei Li Siming Gan Siming Gan |
| author_facet | Jiahong Xu Jiahong Xu Jiahong Xu Mingming Zhou Mingming Zhou Qijie Weng Qijie Weng Mei Li Mei Li Siming Gan Siming Gan |
| author_sort | Jiahong Xu |
| collection | DOAJ |
| description | Clonal testing is crucial for estimating genetic parameters and selecting elite clones. However, few studies have tested clones over two or more rotations. In this study, a clonal trial of the sibs from a Eucalyptus urophylla × Eucalyptus tereticornis cross was used for genetic parameter analyses and multitrait selection based on traits such as across-rotation growth, wood properties, coppicing ability, and coppice chlorophyll fluorescence. Clonal repeatability (H2) estimates for growth traits in the first rotation ranged from 0.73 (diameter at breast height at age 15) to 0.84 (single-tree volume at age 2.5) and were generally higher than those for growth traits in the second rotation (0.11–0.62). H2 estimates for coppicing and chlorophyll fluorescence traits ranged from 0.35 to 0.57 and 0.03 to 0.53, respectively, indicating low to medium genetic control of these traits. Phenotypic correlations (rp) and additive genetic correlations (rg) were generally high among growth traits within a single rotation and among coppicing traits but varied considerably across other trait pairs. In particular, second-rotation volume at 2.5 years showed a very weak rp but a moderately positive rg with early-stage volumes from the first rotation. Multitrait selection index (SI) and multitrait genotype–idiotype distance index (MGIDI) methods were applied at a selection intensity of 15% under four scenarios, each combining two to five traits. Relative genetic gain (RG) and selection efficiency (E) estimates were positive for all traits included in multitrait selection, indicating the usefulness of all selection scenarios. Compared to SI, the MGIDI method produced slightly lower RG and E values for volumes at ages 8 and 15 years, but higher RG and E values for wood basic density and cellulose content at age 8 in the first rotation. This study has important implications for eucalypt clonal breeding and management. |
| format | Article |
| id | doaj-art-8f04b5e0bcc64c56a2e28bcb0427002f |
| institution | DOAJ |
| issn | 1664-462X |
| language | English |
| publishDate | 2025-06-01 |
| publisher | Frontiers Media S.A. |
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| series | Frontiers in Plant Science |
| spelling | doaj-art-8f04b5e0bcc64c56a2e28bcb0427002f2025-08-20T03:07:34ZengFrontiers Media S.A.Frontiers in Plant Science1664-462X2025-06-011610.3389/fpls.2025.15538191553819Across-rotation genetic analysis and multitrait selection in a cloned cross of Eucalyptus urophylla × E. tereticornisJiahong Xu0Jiahong Xu1Jiahong Xu2Mingming Zhou3Mingming Zhou4Qijie Weng5Qijie Weng6Mei Li7Mei Li8Siming Gan9Siming Gan10State Key Laboratory of Tree Genetics and Breeding, Chinese Academy of Forestry, Beijing, ChinaKey Laboratory of State Forestry Administration on Tropical Forestry Research, Research Institute of Tropical Forestry, Chinese Academy of Forestry, Guangzhou, ChinaCollege of Forestry, Nanjing Forestry University, Nanjing, ChinaState Key Laboratory of Tree Genetics and Breeding, Chinese Academy of Forestry, Beijing, ChinaKey Laboratory of State Forestry Administration on Tropical Forestry Research, Research Institute of Tropical Forestry, Chinese Academy of Forestry, Guangzhou, ChinaState Key Laboratory of Tree Genetics and Breeding, Chinese Academy of Forestry, Beijing, ChinaKey Laboratory of State Forestry Administration on Tropical Forestry Research, Research Institute of Tropical Forestry, Chinese Academy of Forestry, Guangzhou, ChinaState Key Laboratory of Tree Genetics and Breeding, Chinese Academy of Forestry, Beijing, ChinaKey Laboratory of State Forestry Administration on Tropical Forestry Research, Research Institute of Tropical Forestry, Chinese Academy of Forestry, Guangzhou, ChinaState Key Laboratory of Tree Genetics and Breeding, Chinese Academy of Forestry, Beijing, ChinaKey Laboratory of State Forestry Administration on Tropical Forestry Research, Research Institute of Tropical Forestry, Chinese Academy of Forestry, Guangzhou, ChinaClonal testing is crucial for estimating genetic parameters and selecting elite clones. However, few studies have tested clones over two or more rotations. In this study, a clonal trial of the sibs from a Eucalyptus urophylla × Eucalyptus tereticornis cross was used for genetic parameter analyses and multitrait selection based on traits such as across-rotation growth, wood properties, coppicing ability, and coppice chlorophyll fluorescence. Clonal repeatability (H2) estimates for growth traits in the first rotation ranged from 0.73 (diameter at breast height at age 15) to 0.84 (single-tree volume at age 2.5) and were generally higher than those for growth traits in the second rotation (0.11–0.62). H2 estimates for coppicing and chlorophyll fluorescence traits ranged from 0.35 to 0.57 and 0.03 to 0.53, respectively, indicating low to medium genetic control of these traits. Phenotypic correlations (rp) and additive genetic correlations (rg) were generally high among growth traits within a single rotation and among coppicing traits but varied considerably across other trait pairs. In particular, second-rotation volume at 2.5 years showed a very weak rp but a moderately positive rg with early-stage volumes from the first rotation. Multitrait selection index (SI) and multitrait genotype–idiotype distance index (MGIDI) methods were applied at a selection intensity of 15% under four scenarios, each combining two to five traits. Relative genetic gain (RG) and selection efficiency (E) estimates were positive for all traits included in multitrait selection, indicating the usefulness of all selection scenarios. Compared to SI, the MGIDI method produced slightly lower RG and E values for volumes at ages 8 and 15 years, but higher RG and E values for wood basic density and cellulose content at age 8 in the first rotation. This study has important implications for eucalypt clonal breeding and management.https://www.frontiersin.org/articles/10.3389/fpls.2025.1553819/fullEucalyptus hybridacross-rotation traitsgenetic parametersmulti-trait genetic selectiongenetic gainselection efficiency |
| spellingShingle | Jiahong Xu Jiahong Xu Jiahong Xu Mingming Zhou Mingming Zhou Qijie Weng Qijie Weng Mei Li Mei Li Siming Gan Siming Gan Across-rotation genetic analysis and multitrait selection in a cloned cross of Eucalyptus urophylla × E. tereticornis Frontiers in Plant Science Eucalyptus hybrid across-rotation traits genetic parameters multi-trait genetic selection genetic gain selection efficiency |
| title | Across-rotation genetic analysis and multitrait selection in a cloned cross of Eucalyptus urophylla × E. tereticornis |
| title_full | Across-rotation genetic analysis and multitrait selection in a cloned cross of Eucalyptus urophylla × E. tereticornis |
| title_fullStr | Across-rotation genetic analysis and multitrait selection in a cloned cross of Eucalyptus urophylla × E. tereticornis |
| title_full_unstemmed | Across-rotation genetic analysis and multitrait selection in a cloned cross of Eucalyptus urophylla × E. tereticornis |
| title_short | Across-rotation genetic analysis and multitrait selection in a cloned cross of Eucalyptus urophylla × E. tereticornis |
| title_sort | across rotation genetic analysis and multitrait selection in a cloned cross of eucalyptus urophylla e tereticornis |
| topic | Eucalyptus hybrid across-rotation traits genetic parameters multi-trait genetic selection genetic gain selection efficiency |
| url | https://www.frontiersin.org/articles/10.3389/fpls.2025.1553819/full |
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