Plant senescence processes and free radicals

Leshem, Y.

doi:10.1016/0891-5849(88)90060-3

Cited by 161 publications

(70 citation statements)

References 73 publications

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“…In addition, H 2 O 2 levels are known to increase in senescing leaves, and external application of H 2 O 2 promotes leaf senescence, possibly through the activation of senescence-associated transcriptional cascades (Leshem, 1988;Navabpour et al, 2003;Mittler et al, 2004;Zimmermann and Zentgraf, 2005;Wu et al, 2012). Notably, ATAF1 is not Table S1).…”

Section: Control Of Senescence By Aba Is Mediated By Ataf1mentioning

confidence: 99%

Transcription Factor ATAF1 in Arabidopsis Promotes Senescence by Direct Regulation of Key Chloroplast Maintenance and Senescence Transcriptional Cascades

et al. 2015

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ORCID IDs: 0000-0001-6523-6848 (S.M.-B.); 0000-0002-5789-4071 (S.B.).Senescence represents a fundamental process of late leaf development. Transcription factors (TFs) play an important role for expression reprogramming during senescence; however, the gene regulatory networks through which they exert their functions, and their physiological integration, are still largely unknown. Here, we identify the Arabidopsis (Arabidopsis thaliana) abscisic acid (ABA)-and hydrogen peroxide-activated TF Arabidopsis thaliana ACTIVATING FACTOR1 (ATAF1) as a novel upstream regulator of senescence. ATAF1 executes its physiological role by affecting both key chloroplast maintenance and senescence-promoting TFs, namely GOLDEN2-LIKE1 (GLK1) and ORESARA1 (ARABIDOPSIS NAC092), respectively. Notably, while ATAF1 activates ORESARA1, it represses GLK1 expression by directly binding to their promoters, thereby generating a transcriptional output that shifts the physiological balance toward the progression of senescence. We furthermore demonstrate a key role of ATAF1 for ABA-and hydrogen peroxide-induced senescence, in accordance with a direct regulatory effect on ABA homeostasis genes, including NINE-CIS-EPOXYCAROTENOID DIOXYGENASE3 involved in ABA biosynthesis and ABC TRANSPORTER G FAMILY MEMBER40, encoding an ABA transport protein. Thus, ATAF1 serves as a core transcriptional activator of senescence by coupling stress-related signaling with photosynthesis-and senescence-related transcriptional cascades.

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Section: Control Of Senescence By Aba Is Mediated By Ataf1mentioning

confidence: 99%

Transcription Factor ATAF1 in Arabidopsis Promotes Senescence by Direct Regulation of Key Chloroplast Maintenance and Senescence Transcriptional Cascades

et al. 2015

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“…Leaf senescence in general is characterized by diminishing photosynthesis accompanied by disintegration of organelle structures, degradative loss of chlorophyll and proteins, disruption of the microtubular network, and a dramatic increase in lipid peroxidation as well as membrane leakiness (Dhindsa et al, 1981;Thompson et al, 1987;Leshem, 1988;Halliwell and Gutteridge, 2006;Schelbert et al, 2009;Keech et al, 2010). Generally, the fi rst visible sign of senescence is the onset of chloroplast degradation (Thomas and Stoddart, 1980;Smart, 1994), concurrent with a decrease of the chlorophyll content, while the catabolic products are transported to the vacuole.…”

Section: Correlations Among Attributes Of Senescence and Antioxidativmentioning

confidence: 99%

Correlations among Attributes of Senescence and Antioxidative Status of Leaf Discs during Epiphyllous Bud Differentiation in Kalanchoe pinnata Lam. (Pers.)

Jaiswal

Chawla

Sawhney

2012

Zeitschrift Für Naturforschung C

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“…Other symptoms of senescence in plants include increases in lipid peroxidation and membrane leakiness, which are associated with the increase in reactive oxygen species (ROS) generation ( Fig. 1C) (Thompson and Lake, 1987;Leshem, 1988). Metabolic changes during leaf senescence include the hydrolysis of macromolecules, such as proteins, lipids, nucleic acids and pigments that were accumulated during the growth phase (Watanabe et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Plant leaf senescence and death – regulation by multiple layers of control and implications for aging in general

Woo

Kim

Nam

et al. 2013

Journal of Cell Science

264

216

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SummaryHow do organisms, organs, tissues and cells change their fate when they age towards senescence and death? Plant leaves provide a unique window to explore this question because they show reproducible life history and are readily accessible for experimental assays. Throughout their lifespan, leaves undergo a series of developmental, physiological and metabolic transitions that culminate in senescence and death. Leaf senescence is an 'altruistic death' that allows for the degradation of the nutrients that are produced during the growth phase of the leaf and their redistribution to developing seeds or other parts of the plant, and thus is a strategy that has evolved to maximize the fitness of the plant. During the past decade, there has been significant progress towards understanding the key molecular principles of leaf senescence using genetic and molecular studies, as well as 'omics' analyses. It is now apparent that leaf senescence is a highly complex genetic program that is tightly controlled by multiple layers of regulation, including at the level of chromatin and transcription, as well as by post-transcriptional, translational and post-translational regulation. This Commentary discusses the latest understandings and insights into the underlying molecular mechanisms, and presents the perspectives necessary to enable our systemlevel understanding of leaf senescence, together with their possible implications for aging in general.

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Plant senescence processes and free radicals

Cited by 161 publications

References 73 publications

Transcription Factor ATAF1 in Arabidopsis Promotes Senescence by Direct Regulation of Key Chloroplast Maintenance and Senescence Transcriptional Cascades

Transcription Factor ATAF1 in Arabidopsis Promotes Senescence by Direct Regulation of Key Chloroplast Maintenance and Senescence Transcriptional Cascades

Correlations among Attributes of Senescence and Antioxidative Status of Leaf Discs during Epiphyllous Bud Differentiation in Kalanchoe pinnata Lam. (Pers.)

Plant leaf senescence and death – regulation by multiple layers of control and implications for aging in general

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