From Accumulation to Degradation: Reprogramming Polyamine Metabolism Facilitates Dark-Induced Senescence in Barley Leaf Cells

Frontiers in Plant Science
Ewa Sobieszczuk-NowickaJolanta Legocka

Abstract

The aim of this study was to analyze whether polyamine (PA) metabolism is involved in dark-induced Hordeum vulgare L. 'Nagrad' leaf senescence. In the cell, the titer of PAs is relatively constant and is carefully controlled. Senescence-dependent increases in the titer of the free PAs putrescine, spermidine, and spermine occurred when the process was induced, accompanied by the formation of putrescine conjugates. The addition of the anti-senescing agent cytokinin, which delays senescence, to dark-incubated leaves slowed the senescence-dependent PA accumulation. A feature of the senescence process was initial accumulation of PAs at the beginning of the process and their subsequent decrease during the later stages. Indeed, the process was accompanied by both enhanced expression of PA biosynthesis and catabolism genes and an increase in the activity of enzymes involved in the two metabolic pathways. To confirm whether the capacity of the plant to control senescence might be linked to PA, chlorophyll fluorescence parameters, and leaf nitrogen status in senescing barley leaves were measured after PA catabolism inhibition and exogenously applied γ-aminobutyric acid (GABA). The results obtained by blocking putrescine oxidation showed ...Continue Reading

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Citations

Nov 28, 2017·Plant Biology·N WojciechowskaA Bagniewska-Zadworna
Jan 1, 2017·Amino Acids·E Sobieszczuk-Nowicka
Jun 28, 2019·Plant Direct·Greta NölkeStefan Schillberg
Sep 8, 2017·Frontiers in Plant Science·Anna PodgórskaBożena Szal
May 28, 2019·Frontiers in Plant Science·Wei WangJi-Hong Liu
Nov 30, 2019·Plant Science : an International Journal of Experimental Plant Biology·Simab Kanwal, Aran Incharoensakdi
Apr 2, 2021·Frontiers in Plant Science·Ewelina Paluch-LubawaEwa Sobieszczuk-Nowicka
May 27, 2021·Plant Science : an International Journal of Experimental Plant Biology·Magda PálTibor Janda

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Methods Mentioned

BETA
environmental stress
PCA
Fluorescence
confocal microscopy

Software Mentioned

KIN
R
Modfluor
limma
BLAST +
MapMan
Bioconductor

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