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Metabolic control of arginine and ornithine levels paces the progression of leaf senescence
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för fysiologisk botanik. Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Umeå Plant Science Centre (UPSC).ORCID-id: 0000-0003-2457-7376
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för fysiologisk botanik. Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Umeå Plant Science Centre (UPSC).ORCID-id: 0000-0003-1093-3317
National Engineering Laboratory for Tree Breeding, College of Biological Sciences and Technology, Beijing Forestry University, Beijing, China.
National Engineering Laboratory for Tree Breeding, College of Biological Sciences and Technology, Beijing Forestry University, Beijing, China.
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2022 (Engelska)Ingår i: Plant Physiology, ISSN 0032-0889, E-ISSN 1532-2548, Vol. 189, nr 4, s. 1943-1960Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Leaf senescence can be induced by stress or aging, sometimes in a synergistic manner. It is generally acknowledged that the ability to withstand senescence-inducing conditions can provide plants with stress resilience. Although the signaling and transcriptional networks responsible for a delayed senescence phenotype, often referred to as a functional stay-green trait, have been actively investigated, very little is known about the subsequent metabolic adjustments conferring this aptitude to survival. First, using the individually darkened leaf (IDL) experimental setup, we compared IDLs of wild-type (WT) Arabidopsis (Arabidopsis thaliana) to several stay-green contexts, that is IDLs of two functional stay-green mutant lines, oresara1-2 (ore1-2) and an allele of phytochrome-interacting factor 5 (pif5), as well as to leaves from a WT plant entirely darkened (DP). We provide compelling evidence that arginine and ornithine, which accumulate in all stay-green contexts—likely due to the lack of induction of amino acids (AAs) transport—can delay the progression of senescence by fueling the Krebs cycle or the production of polyamines (PAs). Secondly, we show that the conversion of putrescine to spermidine (SPD) is controlled in an age-dependent manner. Thirdly, we demonstrate that SPD represses senescence via interference with ethylene signaling by stabilizing the ETHYLENE BINDING FACTOR1 and 2 (EBF1/2) complex. Taken together, our results identify arginine and ornithine as central metabolites influencing the stress- and age-dependent progression of leaf senescence. We propose that the regulatory loop between the pace of the AA export and the progression of leaf senescence provides the plant with a mechanism to fine-tune the induction of cell death in leaves, which, if triggered unnecessarily, can impede nutrient remobilization and thus plant growth and survival.

Ort, förlag, år, upplaga, sidor
Oxford University Press, 2022. Vol. 189, nr 4, s. 1943-1960
Nationell ämneskategori
Botanik Växtbioteknologi
Identifikatorer
URN: urn:nbn:se:umu:diva-198906DOI: 10.1093/plphys/kiac244ISI: 000803838800001PubMedID: 35604104Scopus ID: 2-s2.0-85135924586OAI: oai:DiVA.org:umu-198906DiVA, id: diva2:1692944
Forskningsfinansiär
Vetenskapsrådet, 621-2014-4688KempestiftelsernaCarl Tryggers stiftelse för vetenskaplig forskning , CTS14-247Carl Tryggers stiftelse för vetenskaplig forskning , CTS15-262Knut och Alice Wallenbergs Stiftelse, 2016.0341Knut och Alice Wallenbergs Stiftelse, 2016.0352Vinnova, 2016-00504Tillgänglig från: 2022-09-05 Skapad: 2022-09-05 Senast uppdaterad: 2024-04-09Bibliografiskt granskad

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Liebsch, DanielaJuvany, MartaZiolkowska, AgnieszkaChrobok, DariaBoussardon, ClémentLaw, Simon R.Brouwer, BastiaanLindén, PernillaDelhomme, NicolasStenlund, HansGardeström, PerKeech, Olivier

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Liebsch, DanielaJuvany, MartaZiolkowska, AgnieszkaChrobok, DariaBoussardon, ClémentLaw, Simon R.Brouwer, BastiaanLindén, PernillaDelhomme, NicolasStenlund, HansGardeström, PerKeech, Olivier
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Institutionen för fysiologisk botanikUmeå Plant Science Centre (UPSC)
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Plant Physiology
BotanikVäxtbioteknologi

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