scholarly journals Chemical Perturbation of Chloroplast-Related Processes Affects Circadian Rhythms of Gene Expression in Arabidopsis: Salicylic Acid Application Can Entrain the Clock

2020 ◽  
Vol 11 ◽  
Author(s):  
Koumis Philippou ◽  
Amanda M. Davis ◽  
Seth J. Davis ◽  
Alfredo Sánchez-Villarreal
Keyword(s):  
Gene Expression ◽  
Salicylic Acid ◽  
Circadian Rhythms ◽  
Chemical Perturbation

scholarly journals The Arabidopsis mediator complex subunit 8 regulates oxidative stress responses

2021 ◽  
Author(s):  
Huaming He ◽  
Jordi Denecker ◽  
Katrien Van Der Kelen ◽  
Patrick Willems ◽  
Robin Pottie ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Gene Expression ◽  
Salicylic Acid ◽  
Jasmonic Acid ◽  
Stress Responses ◽  
Negative Regulator ◽  
Mediator Complex ◽  
Defense Gene Expression ◽  
A Genome ◽  
Oxidative Stress Responses

Abstract Signaling events triggered by hydrogen peroxide (H2O2) regulate plant growth and defense by orchestrating a genome-wide transcriptional reprogramming. However, the specific mechanisms that govern H2O2-dependent gene expression are still poorly understood. Here, we identify the Arabidopsis Mediator complex subunit MED8 as a regulator of H2O2 responses. The introduction of the med8 mutation in a constitutive oxidative stress genetic background (catalase-deficient, cat2) was associated with enhanced activation of the salicylic acid pathway and accelerated cell death. Interestingly, med8 seedlings were more tolerant to oxidative stress generated by the herbicide methyl viologen (MV) and exhibited transcriptional hyperactivation of defense signaling, in particular salicylic acid- and jasmonic acid-related pathways. The med8-triggered tolerance to MV was manipulated by the introduction of secondary mutations in salicylic acid and jasmonic acid pathways. In addition, analysis of the Mediator interactome revealed interactions with components involved in mRNA processing and microRNA biogenesis, hence expanding the role of Mediator beyond transcription. Notably, MED8 interacted with the transcriptional regulator NEGATIVE ON TATA-LESS, NOT2, to control the expression of H2O2-inducible genes and stress responses. Our work establishes MED8 as a component regulating oxidative stress responses and demonstrates that it acts as a negative regulator of H2O2-driven activation of defense gene expression.

The effect of salicylic acid on phenylalanine ammonia-lyase and stilbene synthase gene expression in Vitis amurensis Cell Culture

2010 ◽  
Vol 57 (3) ◽  
pp. 415-421 ◽  
Author(s):  
K. V. Kiselev ◽  
A. S. Dubrovina ◽  
G. A. Isaeva ◽  
Y. N. Zhuravlev
Keyword(s):  
Gene Expression ◽  
Cell Culture ◽  
Salicylic Acid ◽  
Phenylalanine Ammonia Lyase ◽  
Stilbene Synthase ◽  
Vitis Amurensis ◽  
Stilbene Synthase Gene

The strength and periodicity of D. melanogaster circadian rhythms are differentially affected by alterations in period gene expression

Neuron ◽  
1991 ◽  
Vol 6 (5) ◽  
pp. 753-766 ◽  
Author(s):  
Xin Liu ◽  
Qiang Yu ◽  
Zuoshi Huang ◽  
Laurence J. Zwiebel ◽  
Jeffrey C. Hall ◽  
...  
Keyword(s):  
Gene Expression ◽  
Circadian Rhythms ◽  
Period Gene

scholarly journals Casein Kinase 1 Underlies Temperature Compensation of Circadian Rhythms in Human Red Blood Cells

2019 ◽  
Vol 34 (2) ◽  
pp. 144-153 ◽  
Author(s):  
Andrew D. Beale ◽  
Emily Kruchek ◽  
Stephen J. Kitcatt ◽  
Erin A. Henslee ◽  
Jack S.W. Parry ◽  
...  
Keyword(s):  
Gene Expression ◽  
Circadian Rhythms ◽  
Red Blood Cells ◽  
Blood Cells ◽  
Temperature Compensation ◽  
Clock Gene ◽  
Cell Types ◽  
Casein Kinase ◽  
Casein Kinase 1 ◽  
Human Red Blood Cells

Temperature compensation and period determination by casein kinase 1 (CK1) are conserved features of eukaryotic circadian rhythms, whereas the clock gene transcription factors that facilitate daily gene expression rhythms differ between phylogenetic kingdoms. Human red blood cells (RBCs) exhibit temperature-compensated circadian rhythms, which, because RBCs lack nuclei, must occur in the absence of a circadian transcription-translation feedback loop. We tested whether period determination and temperature compensation are dependent on CKs in RBCs. As with nucleated cell types, broad-spectrum kinase inhibition with staurosporine lengthened the period of the RBC clock at 37°C, with more specific inhibition of CK1 and CK2 also eliciting robust changes in circadian period. Strikingly, inhibition of CK1 abolished temperature compensation and increased the Q10 for the period of oscillation in RBCs, similar to observations in nucleated cells. This indicates that CK1 activity is essential for circadian rhythms irrespective of the presence or absence of clock gene expression cycles.

Interaction of Arabidopsis TGA3 and WRKY53 transcription factors on Cestrum yellow leaf curling virus (CmYLCV) promoter mediates salicylic acid-dependent gene expression in planta

Planta ◽  
2017 ◽  
Vol 247 (1) ◽  
pp. 181-199 ◽  
Author(s):  
Shayan Sarkar ◽  
Abhimanyu Das ◽  
Prashant Khandagale ◽  
Indu B. Maiti ◽  
Sudip Chattopadhyay ◽  
...  
Keyword(s):  
Gene Expression ◽  
Salicylic Acid ◽  
Transcription Factors ◽  
Yellow Leaf ◽  
In Planta ◽  
Leaf Curling

scholarly journals Bacterial Compound N,N-Dimethylhexadecylamine Modulates Expression of Iron Deficiency and Defense Response Genes in Medicago truncatula Independently of the Jasmonic Acid Pathway

Plants ◽  
2020 ◽  
Vol 9 (5) ◽  
pp. 624 ◽  
Author(s):  
Vicente Montejano-Ramírez ◽  
Ernesto García-Pineda ◽  
Eduardo Valencia-Cantero
Keyword(s):  
Gene Expression ◽  
Salicylic Acid ◽  
Iron Deficiency ◽  
Jasmonic Acid ◽  
Pseudomonas Syringae ◽  
Medicago Truncatula ◽  
Abiotic Stresses ◽  
Biotic And Abiotic Stresses ◽  
Iron Deprivation ◽  
Iron Deficient

Plants face a variety of biotic and abiotic stresses including attack by microbial phytopathogens and nutrient deficiencies. Some bacterial volatile organic compounds (VOCs) activate defense and iron-deficiency responses in plants. To establish a relationship between defense and iron deficiency through VOCs, we identified key genes in the defense and iron-deprivation responses of the legume model Medicago truncatula and evaluated the effect of the rhizobacterial VOC N,N-dimethylhexadecylamine (DMHDA) on the gene expression in these pathways by RT-qPCR. DMHDA increased M. truncatula growth 1.5-fold under both iron-sufficient and iron-deficient conditions compared with untreated plants, whereas salicylic acid and jasmonic acid decreased growth. Iron-deficiency induced iron uptake and defense gene expression. Moreover, the effect was greater in combination with DMHDA. Salicylic acid, Pseudomonas syringae, jasmonic acid, and Botrytis cinerea had inhibitory effects on growth and iron response gene expression but activated defense genes. Taken together, our results showed that the VOC DMHDA activates defense and iron-deprivation pathways while inducing a growth promoting effect unlike conventional phytohormones, highlighting that DMHDA does not mimic jasmonic acid but induces an alternative pathway. This is a novel aspect in the complex interactions between biotic and abiotic stresses.

Changes in the Endogenous Content and Gene Expression of Salicylic Acid Correlate with Grapevine Bud Dormancy Release

2020 ◽  
Author(s):  
María Armida Orrantia-Araujo ◽  
Miguel Ángel Martínez-Téllez ◽  
Marisela Rivera-Domínguez ◽  
Miguel Ángel Hernández-Oñate ◽  
Irasema Vargas-Arispuro
Keyword(s):  
Gene Expression ◽  
Salicylic Acid ◽  
Bud Dormancy ◽  
Dormancy Release ◽  
Bud Dormancy Release

A molecular explanation for the long-term suppression of circadian rhythms by a single light pulse

2001 ◽  
Vol 280 (4) ◽  
pp. R1206-R1212 ◽  
Author(s):  
Jean-Christophe Leloup ◽  
Albert Goldbeter
Keyword(s):  
Gene Expression ◽  
Steady State ◽  
Circadian Rhythms ◽  
Light Pulse ◽  
Molecular Model ◽  
Stable Steady State ◽  
Biochemical Effects ◽  
Actual Duration ◽  
Or Gene

With the use of a molecular model for circadian rhythms in Drosophila based on transcriptional regulation, we show how a single, critical pulse of light can permanently suppress circadian rhythmicity, whereas a second light pulse can restore the abolished rhythm. The phenomena occur via the pulsatile induction of either protein degradation or gene expression in conditions in which a stable steady state coexists with stable circadian oscillations of the limit cycle type. The model indicates that suppression by a light pulse can only be accounted for by assuming that the biochemical effects of such a pulse much outlast its actual duration. We determine the characteristics of critical pulses suppressing the oscillations as a function of the phase at which the rhythm is perturbed. The model predicts how the amplitude and duration of the biochemical changes induced by critical pulses vary with this phase. The results provide a molecular, dynamic explanation for the long-term suppression of circadian rhythms observed in a variety of organisms in response to a single light pulse and for the subsequent restoration of the rhythms by a second light pulse.

Circadian rhythms: from gene expression to behaviour

1992 ◽  
Vol 2 (1) ◽  
pp. 51
Author(s):  
Joseph S Takahashi
Keyword(s):  
Gene Expression ◽  
Circadian Rhythms
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