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Circadian clock components control growth and gibberellin metabolism in Populus 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)ORCID iD: 0000-0003-4448-5858
Forest Bio-Research Center, Forestry and Forest Products Research Institute, Forest Research and Management Organization, 3809-1 Ishi, Juo, Hitachi, Ibaraki 319-1301, Japan.
Umeå University, Faculty of Science and Technology, Department of Plant Physiology. Umeå University, Faculty of Science and Technology, Umeå Plant Science Centre (UPSC).
Umeå University, Faculty of Science and Technology, Umeå Plant Science Centre (UPSC). Umeå University, Faculty of Science and Technology, Department of Plant Physiology.
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(English)Manuscript (preprint) (Other academic)
Abstract [en]

This study investigates the role of the circadian clock in the regulation of gibberellin (GA) metabolism and growth in hybrid aspen (Populus tremula x P. tremuloides (Ptt)). We revealed a conserved function of the clock homolog PttEARLY BIRD1 (PttEBI1), but also implicated its rolein controlling tree growth. GA metabolite profiling and transcriptomic analysis in hybrid aspenlines with modulated expression of PttEBI1 or the core clock homologs PttLATE ELONGATED HYPOCOTYLs (PttLHYs) revealed significant changes in GA metabolism. These alterations werelinked to the differential expression of PttGA2ox8, a gene encoding an enzyme with both GA2-oxidase and GA20-oxidase activities. Our results indicate that modifications to circadian clockcomponents can significantly influence both GA metabolism and tree growth, providing potential strategies for improving tree biomass production.

Keywords [en]
circadian clock, growth, trees, hybrid aspen, populus tremula x tremuloides, gibberellin
National Category
Botany
Identifiers
URN: urn:nbn:se:umu:diva-224574OAI: oai:DiVA.org:umu-224574DiVA, id: diva2:1858923
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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Sjölander, JohanLazaro-Gimeno, DavidGutensohn, MareikeBako, LaszloJohansson, Annika I.Moritz, ThomasEriksson, Maria E.

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Sjölander, JohanLazaro-Gimeno, DavidGutensohn, MareikeBako, LaszloJohansson, Annika I.Moritz, ThomasEriksson, Maria E.
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Department of Plant PhysiologyUmeå Plant Science Centre (UPSC)
Botany

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