Salt-triggered expression of the ANAC092-dependent senescence regulon in<i>Arabidopsis thaliana</i>

Balazadeh, Salma; Wu, Anhui; Mueller‐Roeber, Bernd

doi:10.4161/psb.5.6.11694

Cited by 64 publications

(66 citation statements)

References 18 publications

(26 reference statements)

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“…only induced by ABA (Lu et al, 2007;Wu et al, 2009) but also by external treatment of plants with H 2 O 2 (Balazadeh et al, 2010b) or intracellular elevation of H 2 O 2 level by catalase inhibition (Supplemental Fig. S1C), indicating that it may be positioned at a cross-talk node connecting ABA and H 2 O 2 signaling in plant senescence.…”

Section: Control Of Senescence By Aba Is Mediated By Ataf1mentioning

confidence: 99%

“…As the expression of ATAF1 is induced by treatment of plants with ABA (Lu et al, 2007;Wu et al, 2009) (Balazadeh et al, 2010b), we proposed an ABA-and H 2 O 2 -dependent regulation of its two photosynthesis-and senescence-related target genes (i.e. ORE1 and GLK1) through ATAF1.…”

Section: Aba-and H 2 O 2 -Triggered Expression Changes Are Modified Bmentioning

confidence: 99%

“…ORE1 has been shown previously to regulate the expression of several known SAGs, of which BFN1, SWEET15/SAG29, and SINA1 were shown to be direct targets (Balazadeh et al, 2010a(Balazadeh et al, , 2010bMatallanaRamirez et al, 2013). As ATAF1 regulates ORE1, we hypothesized that modifying ATAF1 expression affects ORE1 target genes.…”

Section: Ataf1 Requires Ore1 For Full Control Over Senescencementioning

confidence: 99%

“…Furthermore, ATAF1 is rapidly (within 1 h) induced in plants treated with H 2 O 2 (Balazadeh et al, 2010b) and in seedlings treated with the catalase inhibitor 3-aminotriazole, which triggers an intracellular rise of H 2 O 2 level (expression data are summarized in Supplemental Fig. S1, A-C).…”

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confidence: 99%

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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%

Section: Aba-and H 2 O 2 -Triggered Expression Changes Are Modified Bmentioning

confidence: 99%

Section: Ataf1 Requires Ore1 For Full Control Over Senescencementioning

confidence: 99%

mentioning

confidence: 99%

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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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“…ROS accumulation increases during and is associated with increased expression of senescence associated genes (Bieker et al 2012;Navabpour et al 2003). In Arabidopsis, 15 senescence-associated NAC domain TFs are upregulated by H 2 O 2 and an oxidative burst played a role in ANAC092-mediated senescence (Balazadeh et al 2010;Petrov and Van Breusegem 2012).…”

Section: Discussionmentioning

confidence: 99%

Delayed expression of SAGs correlates with longevity in CMS wheat plants compared to its fertile plants

Semwal

Singh

Khanna‐Chopra

2014

Physiol Mol Biol Plants

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Reproductive sinks regulate monocarpic senescence in crop plants. Monocarpic senescence was studied in wheat fertile (cv. HW 2041) and its isonuclear cytoplasmic male sterile (CMS) line. CMS plants exhibited slower rate of senescence accompanied by longer green leaf area duration and slower deceleration in chlorophyll, protein content, P N and rubisco content coupled with lower protease activities than fertile (F) plants. CMS plants also exhibited lower ROS levels and less membrane damage than F plants. CMS plants maintained better antioxidant defense, less oxidative damage in chloroplast and higher transcript levels of both rbcL and rbcS genes during senescence than F plants. F plants exhibited early induction and higher expression of SAGs like serine and cysteine proteases, glutamine synthetases GS1 and GS2, WRKY53 transcription factor and decline in transcript levels of CAT1 and CAT2 genes than CMS plants. Hence, using genetically fertile and its CMS line of wheat it is confirmed that delayed senescence in the absence of reproductive sinks is linked with slower protein oxidation, rubisco degradation and delayed activation of SAGs. Better antioxidant defense in chloroplasts at later stages of senescence was able to mitigate the deleterious effects of ROS in CMS plants. We propose that delayed increase in ROS in cytoplasmic male sterile wheat plants resulted in delayed activation of WRKY53, SAGs and the associated biochemical changes than fertile plants.

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Leaf Senescence in Plants: Nutrient Remobilization and Gene Regulation

Sarwat

2016

Stress Signaling in Plants: Genomics and Proteomics Perspective, Volume 2

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Salt-triggered expression of the ANAC092-dependent senescence regulon inArabidopsis thaliana

Cited by 64 publications

References 18 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

Delayed expression of SAGs correlates with longevity in CMS wheat plants compared to its fertile plants

Leaf Senescence in Plants: Nutrient Remobilization and Gene Regulation

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