Genomic breeding for accelerated improvement of growth, wood properties and plant defence in Eucalyptus grandis

dc.contributor.advisorMyburg, Alexander Andrew
dc.contributor.coadvisorIsik, Fikret
dc.contributor.coadvisorHodge, Gary R.
dc.contributor.emailu23101271@tuks.co.zaen_US
dc.contributor.postgraduateMphahlele, Makobatjatji Mmoledi
dc.date.accessioned2022-07-14T14:04:49Z
dc.date.available2022-07-14T14:04:49Z
dc.date.created2022-09
dc.date.issued2022
dc.descriptionThesis (PhD (Genetics))--University of Pretoria, 2022.en_US
dc.description.abstractA 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.en_US
dc.description.availabilityUnrestricteden_US
dc.description.degreePhD (Genetics)en_US
dc.description.departmentGeneticsen_US
dc.description.sponsorshipMondi South Africa (Pty) Ltd: Forestsen_US
dc.description.sponsorshipNational Research Foundation (NRF)en_US
dc.description.sponsorshipForest Molecular Genetics (FMG)en_US
dc.description.sponsorshipForestry and Agricultural Biotechnology Institute (FABI)en_US
dc.identifier.citationMphahlele 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.2021.638969en_US
dc.identifier.otherS2022
dc.identifier.urihttps://repository.up.ac.za/handle/2263/86192
dc.language.isoenen_US
dc.publisherUniversity of Pretoria
dc.rights© 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.
dc.subjectGenomic selectionen_US
dc.subjectSingle-step genomic BLUPen_US
dc.subjectBreeding cycleen_US
dc.subjectGenetic gainen_US
dc.subjectAccelerated breedingen_US
dc.subjectUCTD
dc.titleGenomic breeding for accelerated improvement of growth, wood properties and plant defence in Eucalyptus grandisen_US
dc.typeThesisen_US

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