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Genomic breeding for accelerated improvement of growth, wood properties and plant defence in Eucalyptus grandis
Thesis (PhD (Genetics))--University of Pretoria, 2022.
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| Format: | Thesis |
| Language: | English |
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University of Pretoria
2022
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| _version_ | 1867613526521020416 |
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| access_status_str | Open Access |
| author2 | Myburg, Alexander Andrew |
| author_browse | Myburg, Alexander Andrew |
| author_facet | Myburg, Alexander Andrew |
| collection | Thesis |
| dc_rights_str_mv | © 2022 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. |
| description | Thesis (PhD (Genetics))--University of Pretoria, 2022. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/86192 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:37:33.114Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2022 |
| publishDateRange | 2022 |
| publishDateSort | 2022 |
| publisher | University of Pretoria |
| publisherStr | University of Pretoria |
| record_format | dspace |
| source_str | UPSpace — University of Pretoria Institutional Repository |
| spelling | oai:repository.up.ac.za:2263/86192 Genomic breeding for accelerated improvement of growth, wood properties and plant defence in Eucalyptus grandis Myburg, Alexander Andrew u23101271@tuks.co.za Isik, Fikret Hodge, Gary R. Mphahlele, Makobatjatji Mmoledi Genomic selection Single-step genomic BLUP Breeding cycle Genetic gain Accelerated breeding UCTD Thesis (PhD (Genetics))--University of Pretoria, 2022. A significant benefit of genomic selection (GS) in forest trees is to reduce breeding cycle times and increase gains per unit time. Flowering time (seed-to-seed) of many forest tree species is a crucial factor contributing to the length of breeding cycles. In this study, we investigated the benefits of combining GS with transgenic Flowering locus T (FT)-scion for early floral induction (GS-FT) transgrafting approach in the precocious Eucalyptus grandis and non-precocious E. dunnii, two economically important plantation species. We simulated traditional breeding (TB), GS and GS-FT in the species and compared their transitional cost ratio and their benefit-cost ratio in terms of genetic gain. Implementation of GS and GS-FT compared to TB strategy was 10 to 13.8 fold more expensive for both species. Whereas the transition from GS to GS-FT strategy in both species is 1.2 fold more expensive. This resulted in a punitive benefit-cost ratio implementing GS and GS-FT strategies compared to the TB strategies. The implementation of the GS-FT, compared to the GS strategy, had a profitable benefit-cost ratio. With the adoption of the GS-FT strategy, which effectively removes flowering time as a barrier, similar breeding cycle times are achieved in both species, but E. dunnii benefits more due to the significant reduction in breeding cycle time. Our simulation provides a first indication of the potential benefits of implementing FT floral induction in conjunction with GS breeding strategies in plantation forest species. Mondi South Africa (Pty) Ltd: Forests National Research Foundation (NRF) Forest Molecular Genetics (FMG) Forestry and Agricultural Biotechnology Institute (FABI) Genetics PhD (Genetics) Unrestricted 2022-07-14T14:04:49Z 2022-07-14T14:04:49Z 2022-09 2022 Thesis Mphahlele MM, Isik F, Hodge GR and Myburg AA (2021) Genomic breeding for diameter growth and tolerance to Leptocybe Gall Wasp and Botryosphaeria/Teratosphaeria Fungal Disease Complex in Eucalyptus grandis. Frontier in Plant Science. 12:638969. doi: 10.3389/fpls.2021.638969 S2022 https://repository.up.ac.za/handle/2263/86192 en © 2022 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. application/vnd.openxmlformats-officedocument.spreadsheetml.sheet application/vnd.openxmlformats-officedocument.spreadsheetml.sheet application/pdf University of Pretoria |
| spellingShingle | Genomic selection Single-step genomic BLUP Breeding cycle Genetic gain Accelerated breeding UCTD Genomic breeding for accelerated improvement of growth, wood properties and plant defence in Eucalyptus grandis |
| title | Genomic breeding for accelerated improvement of growth, wood properties and plant defence in Eucalyptus grandis |
| title_full | Genomic breeding for accelerated improvement of growth, wood properties and plant defence in Eucalyptus grandis |
| title_fullStr | Genomic breeding for accelerated improvement of growth, wood properties and plant defence in Eucalyptus grandis |
| title_full_unstemmed | Genomic breeding for accelerated improvement of growth, wood properties and plant defence in Eucalyptus grandis |
| title_short | Genomic breeding for accelerated improvement of growth, wood properties and plant defence in Eucalyptus grandis |
| title_sort | genomic breeding for accelerated improvement of growth wood properties and plant defence in eucalyptus grandis |
| topic | Genomic selection Single-step genomic BLUP Breeding cycle Genetic gain Accelerated breeding UCTD |
| url | https://repository.up.ac.za/handle/2263/86192 |