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Nitrate fertilization may delay autumn leaf senescence, while amino acid treatments do not
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). Reproductive Medicine, Karolinska University Hospital, Stockholm, 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
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
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2022 (English)In: Physiologia Plantarum, ISSN 0031-9317, E-ISSN 1399-3054, Vol. 174, no 3, article id e13690Article in journal (Refereed) Published
Abstract [en]

Fertilization with nitrogen (N)-rich compounds leads to increased growth but may compromise phenology and winter survival of trees in boreal regions. During autumn, N is remobilized from senescing leaves and stored in other parts of the tree to be used in the next growing season. However, the mechanism behind the N fertilization effect on winter survival is not well understood, and it is unclear how N levels or forms modulate autumn senescence. We performed fertilization experiments and showed that treating Populus saplings with inorganic nitrogen resulted in a delay in senescence. In addition, by using precise delivery of solutes into the xylem stream of Populus trees in their natural environment, we found that delay of autumn senescence was dependent on the form of N administered: inorganic N ((Formula presented.)) delayed senescence, but amino acids (Arg, Glu, Gln, and Leu) did not. Metabolite profiling of leaves showed that the levels of tricarboxylic acids, arginine catabolites (ammonium, ornithine), glycine, glycine-serine ratio and overall carbon-to-nitrogen (C/N) ratio were affected differently by the way of applying NO3− and Arg treatments. In addition, the onset of senescence did not coincide with soluble sugar accumulation in control trees or in any of the treatments. We propose that different regulation of C and N status through direct molecular signaling of NO3− and/or different allocation of N between tree parts depending on N forms could account for the contrasting effects of NO3− and tested here amino acids (Arg, Glu, Gln, and Leu) on autumn senescence.

Place, publisher, year, edition, pages
John Wiley & Sons, 2022. Vol. 174, no 3, article id e13690
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Botany
Identifiers
URN: urn:nbn:se:umu:diva-203158DOI: 10.1111/ppl.13690ISI: 000798701400001PubMedID: 35460591Scopus ID: 2-s2.0-85132885123OAI: oai:DiVA.org:umu-203158DiVA, id: diva2:1727390
Funder
Swedish Research CouncilSwedish Research Council FormasKnut and Alice Wallenberg FoundationVinnovaAvailable from: 2023-01-16 Created: 2023-01-16 Last updated: 2023-01-16Bibliographically approved

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Fataftah, NazeerEdlund, ErikLihavainen, JennaBag, PushanBjörkén, LarsJansson, Stefan

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Fataftah, NazeerEdlund, ErikLihavainen, JennaBag, PushanBjörkén, LarsJansson, Stefan
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