scholarly journals The circadian oscillator gene GIGANTEA mediates a long-term response of the Arabidopsis thaliana circadian clock to sucrose

2011 ◽  
Vol 108 (12) ◽  
pp. 5104-5109 ◽  
Author(s):  
N. Dalchau ◽  
S. J. Baek ◽  
H. M. Briggs ◽  
F. C. Robertson ◽  
A. N. Dodd ◽  
...  
Keyword(s):  
Arabidopsis Thaliana ◽  
Circadian Clock ◽  
Circadian Oscillator ◽  
Term Response

scholarly journals The circadian clock contributes to the long-term water use efficiency of Arabidopsis

2019 ◽  
Author(s):  
Noriane M. L. Simon ◽  
Calum A. Graham ◽  
Nicholas E. Comben ◽  
Alistair M. Hetherington ◽  
Antony N. Dodd
Keyword(s):  
Circadian Clock ◽  
Water Use Efficiency ◽  
Water Use ◽  
Biomass Accumulation ◽  
Time Of Day ◽  
Circadian Oscillator ◽  
Circadian Regulation ◽  
Use Efficiency ◽  
The Impact

AbstractIn plants, water use efficiency is a complex trait derived from numerous physiological and developmental characteristics. Here, we investigated the involvement of circadian regulation in long-term water use efficiency. Circadian rhythms are generated by the circadian oscillator, which provides a cellular measure of the time of day. In plants, the circadian oscillator contributes to the regulation of many aspects of physiology, including stomatal opening, the rate of photosynthesis, carbohydrate metabolism and developmental processes. We investigated in Arabidopsis the impact of the misregulation of genes encoding a large number of components of the circadian oscillator upon whole plant, long-term water use efficiency. From this, we identified a role for the circadian oscillator in water use efficiency. This appears to be due to contributions of the circadian clock to the control of transpiration and biomass accumulation. We also identified that the circadian oscillator within guard cells can contribute to long-term water use efficiency. Our experiments indicate that knowledge of circadian regulation will be important for developing future crops that use water more efficiently.One-sentence summaryThe circadian clock in Arabidopsis makes an important contribution to long-term water use efficiency.

scholarly journals Magnesium maintains length of circadian period in Arabidopsis thaliana

2020 ◽  
Author(s):  
J. Romário F. de Melo ◽  
Annelie Gutsch ◽  
Joëlle De Caluwé ◽  
Jean-Christophe Leloup ◽  
Didier Gonze ◽  
...  
Keyword(s):  
Arabidopsis Thaliana ◽  
Circadian Clock ◽  
Translational Regulation ◽  
Magnesium Deficiency ◽  
Circadian Oscillator ◽  
Dependent Manner ◽  
Circadian Period ◽  
Mg Deficiency ◽  
Period Increase ◽  
External Stimuli

AbstractThe circadian clock coordinates the physiological response of a biological system to day and night rhythms through complex loops of transcriptional/ translational regulation. It can respond to external stimuli and adjust generated circadian oscillations accordingly to keep an endogenous period close to 24 h. To date, the interaction between nutritional status and circadian rhythms in plants is poorly understood. Magnesium (Mg) is essential for numerous biological processes in plants and its homeostasis is crucial to maintain optimal development and growth. Magnesium deficiency in young Arabidopsis thaliana seedlings increased the circadian period of pCCA1:LUC oscillations and dampened its amplitude in constant light in a dose-dependent manner. Although circadian period increase by Mg deficiency was light dependent, it did not depend on active photosynthesis. Mathematical modelling of the Mg input to the circadian clock reproduced the experimental increase of the circadian period and suggested that Mg is likely to affect global transcription/translation levels rather than a single component of the circadian oscillator. The model prediction was supported by a synergistic interaction between Mg deficiency and cyclohexamide, an inhibitor of translation. These findings suggest that proper Mg supply is required to support proper timekeeping in plants.One sentence summaryMagnesium maintains the circadian period in Arabidopsis seedlings and interferes with the circadian oscillator most likely through translational mechanisms.

scholarly journals Wind-evoked anemotropism affects the morphology and mechanical properties of Arabidopsis

2020 ◽  
Author(s):  
Oleksandr Zhdanov ◽  
Michael R Blatt ◽  
Hossein Zare-Behtash ◽  
Angela Busse
Keyword(s):  
Mechanical Properties ◽  
Arabidopsis Thaliana ◽  
Mechanical Stress ◽  
Opposite Direction ◽  
Mechanical Stimulus ◽  
Mechanical Stimuli ◽  
Tissue Organization ◽  
Term Response ◽  
Morphology And Mechanical Properties

Abstract Plants are known to exhibit a thigmomorphogenetic response to mechanical stimuli by altering their morphology and mechanical properties. Wind is widely perceived as mechanical stress and in many experiments its influence is simulated by applying mechanical perturbations. However, it is known that wind-induced effects on plants can differ and at times occur even in the opposite direction compared with those induced by mechanical perturbations. In the present study, the long-term response of Arabidopsis thaliana to a constant unidirectional wind was investigated. We found that exposure to wind resulted in a positive anemotropic response and in significant alterations to Arabidopsis morphology, mechanical properties, and anatomical tissue organization that were associated with the plant’s strategy of acclimation to a windy environment. Overall, the observed response of Arabidopsis to wind differs significantly from previously reported responses of Arabidopsis to mechanical perturbations. The presented results suggest that the response of Arabidopsis is sensitive to the type of mechanical stimulus applied, and that it is not always straightforward to simulate one type of perturbation by another.

scholarly journals Adaptation of flocculent anammox culture to low temperature by cold shock: long-term response of microbial population

2021 ◽  
pp. 1-19
Author(s):  
Vojtech Kouba ◽  
Juan Camilo Gerlein ◽  
Andrea Benakova ◽  
Marco Antonio Lopez Marin ◽  
Eva Rysava ◽  
...  
Keyword(s):  
Low Temperature ◽  
Cold Shock ◽  
Microbial Population ◽  
Term Response

Unfolding the case of returnees: How the European Union and its member States are addressing the return of foreign fighters and their families

2021 ◽  
pp. 1-23
Author(s):  
Carlota Rigotti ◽  
Júlia Zomignani Barboza
Keyword(s):  
European Union ◽  
Perceived Threat ◽  
The European Union ◽  
Security Threat ◽  
Short Term ◽  
Member States ◽  
Foreign Fighters ◽  
Term Response

Abstract The return of foreign fighters and their families to the European Union has mostly been considered a security threat by member States, which consequently adopt repressive measures aimed at providing an immediate, short-term response to this perceived threat. In addition to this strong-arm approach, reintegration strategies have also been used to prevent returnees from falling back into terrorism and to break down barriers of hostility between citizens in the long term. Amidst these different strategies, this paper seeks to identify which methods are most desirable for handling returnees.

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