Circadian Rhythms in Stomata: Physiological and Molecular Aspects

Hubbard, Kevin M.; Hotta, Carlos Takeshi; Gardner, Michael; Baek, Soeng Jin; Dalchau, Neil; Suhita, Dontamala; Dodd, Antony N.; Webb, Alex A. R.

doi:10.1007/978-3-540-68071-0_8

Cited by 13 publications

(18 citation statements)

References 113 publications

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“…Circadian biologists have addressed how the clock regulates water use efficiency [ 15 ] and they often mention circadian regulation as important for attaining optimal stomatal conductance [ 16 ]. However, we are unaware of any direct tests for stomatal optimality incorporating circadian regulation.…”

Section: Introductionmentioning

confidence: 99%

Circadian Regulation Does Not Optimize Stomatal Behaviour

Dios

Anderegg

et al. 2020

Plants

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The circadian clock is a molecular timer of metabolism that affects the diurnal pattern of stomatal conductance (gs), amongst other processes, in a broad array of plant species. The function of circadian gs regulation remains unknown and here, we test whether circadian regulation helps to optimize diurnal variations in stomatal conductance. We subjected bean (Phaseolus vulgaris) and cotton (Gossypium hirsutum) canopies to fixed, continuous environmental conditions of photosynthetically active radiation, temperature, and vapour pressure deficit (free-running conditions) over 48 h. We modelled gs variations in free-running conditions to test for two possible optimizations of stomatal behaviour under circadian regulation: (i) that stomata operate to maintain constant marginal water use efficiency; or (ii) that stomata maximize C net gain minus the costs or risks of hydraulic damage. We observed that both optimization models predicted gs poorly under free-running conditions, indicating that circadian regulation does not directly lead to stomatal optimization. We also demonstrate that failure to account for circadian variation in gs could potentially lead to biased parameter estimates during calibrations of stomatal models. More broadly, our results add to the emerging field of plant circadian ecology, where circadian controls may partially explain leaf-level patterns observed in the field.

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Section: Introductionmentioning

confidence: 99%

Circadian Regulation Does Not Optimize Stomatal Behaviour

Dios

Anderegg

et al. 2020

Plants

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“…It has been recognized that the circadian clock at 126 least in part controls these diurnal modifications in A and g s responses over the diurnal 127 period (e.g. Hassidim et al, 2017), through regulating the temporal 128 patterns of transcription in photosynthesis, stomatal opening and other physiological 129 processes (Gorton et al, 1989(Gorton et al, , 1993Hubbard & Webb, 2015). Phase adjustment of the over the entire diurnal period, as these will have important implications for cumulative A 141 and water loss as well as model predictions.…”

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confidence: 99%

Acclimation to Fluctuating Light Impacts the Rapidity of Response and Diurnal Rhythm of Stomatal Conductance

2018

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“…Stomata and mesophyll cell processes may be controlled by distinct circadian clocks in C 3 species (Hubbard and Webb, 2016), and understanding the interplay between these cycles could provide insights for the coordination of CAM, as well as the interplay between responses to internal and external signals via metabolite feedback, internal CO 2 availability (C i ), and environmental cues (Fig. 1).…”

Section: Stomatal Sensitivity To Endogenous Stimuli: Control Of and mentioning

confidence: 99%

“…The circadian rhythm of CAM plants involves the same system of clock genes as have been intensively studied in Arabidopsis (Arabidopsis thaliana; Boxall et al, 2005;Hubbard and Webb, 2016) and controls diurnal oscillations in physiological processes including photosynthetic enzyme activity (Nimmo, 2000;Hartwell, 2005). However, there is evidence for an important role for metabolite control of the temporal dynamics of the CAM cycle.…”

Section: Stomatal Sensitivity To Endogenous Stimuli: Control Of and mentioning

confidence: 99%

Stomatal Biology of CAM Plants

Males

Griffiths

2017

Plant Physiol.

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ORCID ID: 0000-0001-9899-8101 (J.M.).Crassulacean acid metabolism (CAM) is a major physiological syndrome that has evolved independently in numerous land plant lineages. CAM plants are of great ecological significance, and there is increasing interest for their water-use efficiency and drought resistance. Integral to the improvement in water-use efficiency that CAM affords is a unique pattern of stomatal conductance, distinguished by primarily nocturnal opening and often extensive diurnal flexibility in response to environmental factors. Here, we assess how recent research has shed new light on the functional biology of CAM plant stomata and integration within the broader physiology and ecology of succulent organisms. Divergences in stomatal sensitivity to environmental and endogenous factors relative to C 3 species have been a key aspect of the evolution of functional CAM. Stomatal traits of CAM plants are closely coordinated with other leaf functional traits, and structural specialization of CAM stomatal complexes may be of undiagnosed functional relevance. We also highlight how salient results from ongoing work on C 3 plant stomatal biology could apply to CAM species. Key questions remaining relate to the interdependence between stomatal and mesophyll responses and are particularly relevant for bioengineering of CAM traits or bioenergy crops to exploit enhanced water-use efficiency and productivity on marginal land. With the increasing availability of powerful analytical tools and the emergence of new model systems for the study of the molecular basis of physiological traits in CAM plants, many exciting avenues for future research are open to intrepid investigators.

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Circadian Rhythms in Stomata: Physiological and Molecular Aspects

Cited by 13 publications

References 113 publications

Circadian Regulation Does Not Optimize Stomatal Behaviour

Circadian Regulation Does Not Optimize Stomatal Behaviour

Acclimation to Fluctuating Light Impacts the Rapidity of Response and Diurnal Rhythm of Stomatal Conductance

Stomatal Biology of CAM Plants

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