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GIGANTEA influences leaf senescence in trees in two different ways
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, Department of Plant Physiology. Umeå University, Faculty of Science and Technology, Umeå Plant Science Centre (UPSC).ORCID iD: 0000-0003-3858-4606
Department of Forest Genetics and Plant Physiology, Umeå Plant Science Centre, Swedish University of Agricultural Sciences (SLU), Umeå, Sweden.
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: 0000-0001-7979-8876
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2021 (English)In: Plant Physiology, ISSN 0032-0889, E-ISSN 1532-2548, Vol. 187, no 4, p. 2435-2450Article in journal (Refereed) Published
Abstract [en]

GIGANTEA (GI) genes have a central role in plant development and influence several processes. Hybrid aspen T89 (Populus tremula x tremuloides) trees with low GI expression engineered through RNAi show severely compromised growth. To study the effect of reduced GI expression on leaf traits with special emphasis on leaf senescence, we grafted GI-RNAi scions onto wild-type rootstocks and successfully restored growth of the scions. The RNAi line had a distorted leaf shape and reduced photosynthesis, probably caused by modulation of phloem or stomatal function, increased starch accumulation, a higher carbon-to-nitrogen ratio, and reduced capacity to withstand moderate light stress. GI-RNAi also induced senescence under long day (LD) and moderate light conditions. Furthermore, the GI-RNAi lines were affected in their capacity to respond to “autumn environmental cues” inducing senescence, a type of leaf senescence that has physiological and biochemical characteristics that differ from those of senescence induced directly by stress under LD conditions. Overexpression of GI delayed senescence under simulated autumn conditions. The two different effects on leaf senescence under LD or simulated autumn conditions were not affected by the expression of FLOWERING LOCUS T. GI expression regulated leaf senescence locally-the phenotype followed the genotype of the branch, independent of its position on the tree-and trees with modified gene expression were affected in a similar way when grown in the field as under controlled conditions. Taken together, GI plays a central role in sensing environmental changes during autumn and determining the appropriate timing for leaf senescence in Populus.

Place, publisher, year, edition, pages
Oxford University Press, 2021. Vol. 187, no 4, p. 2435-2450
National Category
Botany Plant Biotechnology
Identifiers
URN: urn:nbn:se:umu:diva-190823DOI: 10.1093/plphys/kiab439ISI: 000733403700044Scopus ID: 2-s2.0-85121117394OAI: oai:DiVA.org:umu-190823DiVA, id: diva2:1623455
Funder
VinnovaSwedish Research Council FormasKnut and Alice Wallenberg FoundationSwedish Research CouncilEU, Horizon 2020, 675006Available from: 2021-12-29 Created: 2021-12-29 Last updated: 2023-09-05Bibliographically approved

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Fataftah, NazeerBag, PushanLihavainen, JennaJansson, Stefan

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