Suppressor of Overexpression of CO 1 Negatively Regulates Dark-Induced Leaf Degreening and Senescence by Directly Repressing Pheophytinase and Other Senescence-Associated Genes in Arabidopsis

Chen, Junyi; Zhu, Xiaoyu; Ren, Jun; Qiu, Kai; Li, Zhongpeng; Xie, Zuokun; Gao, Jiong; Zhou, Xin; Kuai, Benke

doi:10.1104/pp.16.01457

Cited by 34 publications

(27 citation statements)

References 57 publications

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“…ABF4 also binds to the NYC1 promoter (Nakajima et al, 2012). Some other positive and negative transcription factors are known to regulate the NYC1 gene directly (Chen et al, 2017;Liang et al, 2014;Oda-Yamamizo et al, 2016;Sakuraba et al, 2014a;Zhu et al, 2015). Regulation of these factors by SGR overexpression remains to be investigated.…”

Section: Induction Of Chlorophyll B Degradation By Chlorophyll a Degrmentioning

confidence: 99%

Mg-dechelation of chlorophyll a by Stay-Green activates chlorophyll b degradation through expressing Non-Yellow Coloring 1 in Arabidopsis thaliana

Sato

Shimoda

Matsuda

et al. 2018

Journal of Plant Physiology

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The first step in chlorophyll a degradation is the extraction of the central Mg. This reaction is catalyzed by Mg-dechelatase encoded by Stay-Green (SGR) in land plants. SGR extracts Mg from chlorophyll a but not from chlorophyll b, and chlorophyll b must be converted to chlorophyll a before degradation. The first reaction of the chlorophyll b to chlorophyll a conversion is catalyzed by chlorophyll b reductase. Non-Yellow Coloring 1 (NYC1) and NYC1 like (NOL) are isozymes of chlorophyll b reductase. When SGR was transiently overexpressed in Arabidopsis, both chlorophyll a and b were degraded, suggesting that the chlorophyll b to chlorophyll a conversion is activated by SGR overexpression. To examine the involvement of chlorophyll b reductases in SGR-induced chlorophyll b degradation, SGR was transiently overexpressed in nyc1, nol, and nyc1 nol double mutants by dexamethasone treatment. It was found that in the wild type and nol mutant, chlorophyll a and b were degraded and all the chlorophyll-binding proteins decreased. Meanwhile, in nyc1 and nyc1 nol mutants, chlorophyll b degradation was suppressed and the light-harvesting complex of photosystem II remained. The mRNA and protein levels of NYC1 increased after SGR overexpression in wild type plants. These results suggest that Mg-dechelation of chlorophyll a by SGR activates chlorophyll b degradation by inducing the expression of NYC1. This is an effective regulation of a metabolic pathway.

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Section: Induction Of Chlorophyll B Degradation By Chlorophyll a Degrmentioning

confidence: 99%

Mg-dechelation of chlorophyll a by Stay-Green activates chlorophyll b degradation through expressing Non-Yellow Coloring 1 in Arabidopsis thaliana

Sato

Shimoda

Matsuda

et al. 2018

Journal of Plant Physiology

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“…Recently, in a study designed for exploring the transcriptional regulation of PPH , Chen et al ( 2017 ) demonstrated that SUPPRESSOR OF OVEREXPRESSION OF CO 1 (SOC1), a flowering pathway integrator, associates with the promoter of PPH , and negatively regulates its transcription. Under dark treatment, leaves of soc1-6 mutant yellowed earlier, whereas those of iSOC1-OE lines partially stayed green, in comparison to their respective controls.…”

Section: The Molecular Mechanism Of Light Signaling In Regulating Chlmentioning

confidence: 99%

“…In last few years, the success in revealing the biochemical pathway of Chl degradation has led to a rapid progress in elucidation of the molecular mechanisms. Particularly, substantial progress has been made on elucidation of the regulatory roles of ethylene, abscisic acid (ABA), jasmonic acid (JA), and light signaling components on Chl degradation, and a number of regulatory factors of CCGs have been identified by using the methods of biochemistry, genetics, and bioinformatics (Delmas et al, 2013 ; Liang et al, 2014 ; Sakuraba et al, 2014 , 2016 ; Song et al, 2014 ; Qiu et al, 2015 ; Zhang et al, 2015 ; Zhu et al, 2015 ; Gao et al, 2016 ; Ghandchi et al, 2016 ; Li et al, 2016 ; Oda-Yamamizo et al, 2016 ; Yin et al, 2016 ; Chen et al, 2017 ; Mao et al, 2017 ; Table 1 ). These advances provide some valuable insight into the complexity of the molecular mechanism of hormone- and light-regulated Chl degradation.…”

Section: Introductionmentioning

confidence: 99%

“… f Transient over-expression of oilseed rape BnaNAC55 (Brassica napus L.) lead to a significant decrease in Chl content in Nicotiana benthamiana leaves (Niu et al, 2016 ) . g SOC1 is a negative regulator of Chl degradation during leaf degreening and senescence (Chen et al, 2017 ) . …”

Section: Introductionmentioning

confidence: 99%

“… g SOC1 is a negative regulator of Chl degradation during leaf degreening and senescence (Chen et al, 2017 ) . …”

Section: Introductionmentioning

confidence: 99%

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Phytohormone and Light Regulation of Chlorophyll Degradation

et al. 2017

Self Cite

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Degreening, due to the net loss of chlorophyll (Chl), is the most prominent symptom during the processes of leaf senescence, fruit ripening, and seed maturation. Over the last decade or so, extensive identifications of Chl catabolic genes (CCGs) have led to the revelation of the biochemical pathway of Chl degradation. As such, exploration of the regulatory mechanism of the degreening process is greatly facilitated. During the past few years, substantial progress has been made in elucidating the regulation of Chl degradation, particularly via the mediation of major phytohormones' signaling. Intriguingly, ethylene and abscisic acid's signaling have been demonstrated to interweave with light signaling in mediating the regulation of Chl degradation. In this review, we briefly summarize this progress, with an effort on providing a framework for further investigation of multifaceted and hierarchical regulations of Chl degradation.

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Gene expression changes occurring at bolting time are associated with leaf senescence in Arabidopsis

Brusslan

2020

Plant Direct

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In plants, the vegetative to reproductive phase transition (termed bolting in Arabidopsis) generally precedes age‐dependent leaf senescence (LS). Many studies describe a temporal link between bolting time and LS, as plants that bolt early, senesce early, and plants that bolt late, senesce late. The molecular mechanisms underlying this relationship are unknown and are potentially agriculturally important, as they may allow for the development of crops that can overcome early LS caused by stress‐related early‐phase transition. We hypothesized that leaf gene expression changes occurring in synchrony with bolting were regulating LS. ARABIDOPSIS TRITHORAX (ATX) enzymes are general methyltransferases that regulate the adult vegetative to reproductive phase transition. We generated an atx1, atx3, and atx4 (atx1,3,4) triple T‐DNA insertion mutant that displays both early bolting and early LS. This mutant was used in an RNA‐seq time‐series experiment to identify gene expression changes in rosette leaves that are likely associated with bolting. By comparing the early bolting mutant to vegetative WT plants of the same age, we were able to generate a list of differentially expressed genes (DEGs) that change expression with bolting as the plants age. We trimmed the list by intersection with publicly available WT datasets, which removed genes from our DEG list that were atx1,3,4 specific. The resulting 398 bolting‐associated genes (BAGs) are differentially expressed in a mature rosette leaf at bolting. The BAG list contains many well‐characterized LS regulators (ORE1, WRKY45, NAP, WRKY28), and GO analysis revealed enrichment for LS and LS‐related processes. These bolting‐associated LS regulators may contribute to the temporal coupling of bolting time to LS.

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Suppressor of Overexpression of CO 1 Negatively Regulates Dark-Induced Leaf Degreening and Senescence by Directly Repressing Pheophytinase and Other Senescence-Associated Genes in Arabidopsis

Cited by 34 publications

References 57 publications

Mg-dechelation of chlorophyll a by Stay-Green activates chlorophyll b degradation through expressing Non-Yellow Coloring 1 in Arabidopsis thaliana

Mg-dechelation of chlorophyll a by Stay-Green activates chlorophyll b degradation through expressing Non-Yellow Coloring 1 in Arabidopsis thaliana

Phytohormone and Light Regulation of Chlorophyll Degradation

Gene expression changes occurring at bolting time are associated with leaf senescence in Arabidopsis

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