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Biotechnological adaptation of seasonal growth using high yielding Populus gibberellin overproducing trees
Umeå University, Faculty of Science and Technology, Department of Plant Physiology. Umeå University, Faculty of Science and Technology, Umeå Plant Science Centre (UPSC). (Maria E. Eriksson)
Umeå University, Faculty of Science and Technology, Department of Plant Physiology. Umeå University, Faculty of Science and Technology, Umeå Plant Science Centre (UPSC). (Maria E. Eriksson)ORCID iD: 0000-0003-4448-5858
Umeå University, Faculty of Science and Technology, Department of Mathematics and Mathematical Statistics. Umeå University, Faculty of Science and Technology, Umeå Plant Science Centre (UPSC). Umeå University, Faculty of Science and Technology, Department of Plant Physiology.
Umeå University, Faculty of Science and Technology, Department of Plant Physiology. Umeå University, Faculty of Science and Technology, Umeå Plant Science Centre (UPSC).ORCID iD: 0000-0001-7831-7946
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(English)Manuscript (preprint) (Other academic)
Abstract [en]

Tree growth is central to terrestrial ecology and the forestry industry. The overproduction by biotechnological means of hormones such as gibberellins (GAs) has been used as a powerful toolto greatly increase tree yield and wood properties. However, for trees in temperate and boreal regions, overexpressing GAs prevents the ability to induce vegetative dormancy, and results in reduced yield and tree loss over time. Since Populus trees are using an internal 24-h (circadian) clock to synchronize their metabolism and growth with local, predictable changes in the external environment, we focused on circadian control of GA metabolism, to showcase the principle of seasonal growth adaptation. To obtain both maintained growth benefits and a seasonally timed growth, we set out to modulate levels of bioactive GAs by using the endogenous Populus tremula× P. tremuloides CycD3 promoter. We show that both high yield and biotechnical seasonal growth adaptation is obtained with this promoter, which is coordinated by the clock protein LATE ELONGATED HYPOCOTYL 2 (PttLHY2). This work paves the way for future precision breeding of trees with local adaptation and increased yield. 

Keywords [en]
circadian clock, growth, trees, hybrid aspen, populus tremula x tremuloides, gibberellin, biomass, cyclind3
National Category
Botany
Identifiers
URN: urn:nbn:se:umu:diva-224575OAI: oai:DiVA.org:umu-224575DiVA, id: diva2:1858930
Available from: 2024-05-20 Created: 2024-05-20 Last updated: 2024-05-21
In thesis
1. Timing is everything: exploring the role of the circadian clock in plant growth and adaptation
Open this publication in new window or tab >>Timing is everything: exploring the role of the circadian clock in plant growth and adaptation
2024 (English)Doctoral thesis, comprehensive summary (Other academic)
Alternative title[sv]
Timing är allt: växters cirkadiska klocka och dess kontroll av tillväxt och anpassning
Abstract [en]

Due to their sessile nature, plants must precisely time and coordinate their physiological processes with daily and seasonal changes in the environment. In this PhD thesis, I explored the interaction between an internal timekeeper, or circadian clock, and hormonal regulation, and how it may control plant growth and adaptation in the model species Arabidopsis thaliana (Arabidopsis) and hybrid aspen (Populus tremula x P. tremuloides). 

Our research showed how the circadian clock component ZEITLUPE (ZTL) regulates abscisic acid (ABA)-mediated stomatal closure, indicating its central role in environmental adaptation.  

We investigated the effects of manipulating gibberellin (GA) metabolism in hybrid aspen by the strategic expression of the Arabidopsis GIBBERELLIN20-OXIDASE1 gene, using a clock-controlled promoter. This approach struck a delicate balance between enhanced growth and seasonal adaptation and showed potential for increased tree performance through biotechnological means.

Our studies on the circadian clock components LATE ELONGATED HYPOCOTYL (LHY) and EARLY BIRD (EBI) in hybrid aspen suggested their involvement in regulating GA metabolism and overall plant growth.

Taken together, these findings improve our understanding of how plants regulate growth and respond to environmental stresses and help to provide solutions for enhancing plant resilience and productivity.

Place, publisher, year, edition, pages
Umeå: Umeå University, 2024. p. 100
Keywords
circadian clock, growth, trees, hybrid aspen, populus tremula x tremuloides, gibberellin, ABA
National Category
Botany
Research subject
Molecular Biology; biology
Identifiers
urn:nbn:se:umu:diva-224635 (URN)978-91-8070-421-2 (ISBN)978-91-8070-422-9 (ISBN)
Public defence
2024-06-14, Lilla hörsalen, KBC byggnad, Linnaeus väg 6, 90736, Umeå, 10:00 (English)
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Supervisors
Available from: 2024-05-24 Created: 2024-05-21 Last updated: 2024-05-22Bibliographically approved

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Jurca, ManuelaSjölander, JohanMariën, BertoldSingh, Rajesh KumarYu, JunMoritz, ThomasEriksson, Maria E.

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Jurca, ManuelaSjölander, JohanMariën, BertoldSingh, Rajesh KumarYu, JunMoritz, ThomasEriksson, Maria E.
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Department of Plant PhysiologyUmeå Plant Science Centre (UPSC)Department of Mathematics and Mathematical StatisticsDepartment of Molecular Biology (Faculty of Medicine)
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