MYB96 shapes the circadian gating of ABA signaling in Arabidopsis

Lee, Hong Gil; Más, Paloma Díaz; Seo, Pil Joon

doi:10.1038/srep17754

Cited by 53 publications

(57 citation statements)

References 41 publications

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“…However, the early leaf senescence in EC mutants cannot be solely attributed to the impact on JA signaling. A number of master transcription factors involved in ABA and ethylene response were also found highly upregulated in our transcriptome data, such as MYB96, ABI5, and ERF1/6/11 (Sakuraba et al, 2014;Lee et al, 2016). Furthermore, the transcript levels of NAP and ORE1, two key components of age-dependent and ethylene-mediated SAGs (Guo and Gan, 2006;Rauf et al, 2013), were appreciably upregulated in the lux-6 mutant.…”

Section: Discussionmentioning

confidence: 50%

Circadian Evening Complex Represses Jasmonate-Induced Leaf Senescence in Arabidopsis

et al. 2018

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Plants initiate leaf senescence to reallocate energy and nutrients from aging to developing tissues for optimizing growth fitness and reproduction at the end of the growing season or under stress. Jasmonate (JA), a lipid-derived phytohormone, is known as an important endogenous signal in inducing leaf senescence. However, whether and how the circadian clock gates JA signaling to induce leaf senescence in plants remains elusive. In this study, we show that Evening Complex (EC), a core component of the circadian oscillator, negatively regulates leaf senescence in Arabidopsis thaliana. Transcriptomic profiling analysis reveals that EC is closely involved in JA signaling and response, consistent with accelerated leaf senescence unanimously displayed by EC mutants upon JA induction. We found that EC directly binds the promoter of MYC2, which encodes a key activator of JA-induced leaf senescence, and represses its expression. Genetic analysis further demonstrated that the accelerated JA-induced leaf senescence in EC mutants is abrogated by myc2 myc3 myc4 triple mutation. Collectively, these results reveal a critical molecular mechanism illustrating how the core component of the circadian clock gates JA signaling to regulate leaf senescence.

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Section: Discussionmentioning

confidence: 50%

Circadian Evening Complex Represses Jasmonate-Induced Leaf Senescence in Arabidopsis

et al. 2018

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“…ABA induces a complex circadian response, with exogenous ABA having no effect or increasing the circadian period in plants grown in the presence of Suc (Hanano et al, 2006;Liu et al, 2013). Conversely, ABA shortens the circadian period in the absence of exogenous Suc (Lee et al, 2016). We were able to recapitulate this latter phenotype in wild-type plants under our conditions (grown in the absence of exogenous Suc; Fig.…”

Section: Discussion Pap Accumulation Is Sufficient To Extend Circadiamentioning

confidence: 63%

3′-Phosphoadenosine 5′-Phosphate Accumulation Delays the Circadian System

2018

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The circadian system optimizes cellular responses to stress, but the signaling pathways that convey the metabolic consequences of stress into this molecular timekeeping mechanism remain unclear. Redox regulation of the SAL1 phosphatase during abiotic stress initiates a signaling pathway from chloroplast to nucleus by regulating the accumulation of a metabolite, 3'-phosphoadenosine 5'-phosphate (PAP). Consequently, PAP accumulates in response to redox stress and inhibits the activity of exoribonucleases (XRNs) in the nucleus and cytosol. We demonstrated that osmotic stress induces a lengthening of circadian period and that genetically inducing the SAL1-PAP-XRN pathway in plants lacking either SAL1 or XRNs similarly delays the circadian system. Exogenous application of PAP was also sufficient to extend circadian period. Thus, SAL1-PAP-XRN signaling likely regulates circadian rhythms in response to redox stress. Our findings exemplify how two central processes in plants, molecular timekeeping and responses to abiotic stress, can be interlinked to regulate gene expression.

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“…The circadian clock controls genes of the photoperiod response pathway and Ppd-H1 519 itself is a barley homolog of an Arabidopsis clock genes (Faure et al, 2012;Campoli 520 et al, 2013). Furthermore, the circadian clock controls stress adaptation and is itself 521 regulated by stress cues (Liu et al, 2013;Tamaru et al, 2013;Habte et al, 2014;522 Grundy et al, 2015;Lee et al, 2016;Ejaz and von Korff, 2017;Guadagno et al, 2018).…”

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confidence: 99%

Ppd-H1integrates drought stress signals to control spike development and flowering time in barley

Gol

Haraldsson

Schmising

2020

Preprint

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Highlight 19 We show that Ppd-H1 integrates photoperiod and drought stress signals via 20 FLOWERING LOCUS T 1 (FT1) and the downstream MADS-box genes BM3 and BM8 21 to modulate reproductive development, and shoot and spike morphology in barley. 22Abstract 23 Drought impairs growth and spike development and is therefore a major cause of yield 24 losses in the temperate cereals barley and wheat. Here, we show that the photoperiod 25 response gene PHOTOPERIOD-H1 (Ppd-H1) interacts with drought stress signals to 26 modulate spike development. We tested the effects of a continuous mild and a transient 27 severe drought stress on developmental timing and spike development in spring barley 28 cultivars with a natural mutation in ppd-H1 and derived introgression lines carrying the 29 wild-type Ppd-H1 allele from wild barley. Mild drought reduced the spikelet number and 30 delayed floral development in spring cultivars but not the introgression lines with a wild-31 type Ppd-H1 allele. Similarly, drought-triggered reductions in plant height, tiller and 32 spike number were more pronounced in the parental lines compared to the 33 introgression lines. Transient severe stress halted growth and floral development, upon 34 rewatering introgression lines, but not the spring cultivars, accelerated development so 35 that control and stressed plants flowered almost simultaneously. These genetic 36 differences in development were correlated with a differential downregulation of the 37 flowering promotors FLOWERING LOCUS T1 and the BARLEY MADS-box genes 38 BM3 and BM8. Our findings, therefore, demonstrate that Ppd-H1 affects 39 developmental plasticity in response to drought in barley. 40 41

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MYB96 shapes the circadian gating of ABA signaling in Arabidopsis

Cited by 53 publications

References 41 publications

Circadian Evening Complex Represses Jasmonate-Induced Leaf Senescence in Arabidopsis

Circadian Evening Complex Represses Jasmonate-Induced Leaf Senescence in Arabidopsis

3′-Phosphoadenosine 5′-Phosphate Accumulation Delays the Circadian System

Ppd-H1integrates drought stress signals to control spike development and flowering time in barley

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