Genetic variation in circadian regulation of nocturnal stomatal conductance enhances carbon assimilation and growth
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Circadian resonance, whereby a plant's endogenous rhythms are tuned to match environmental cues, has been repeatedly shown to be adaptive, although the underlying mechanisms remain elusive. Concomitantly, the adaptive value of nocturnal transpiration in C3 plants remains unknown because it occurs without carbon assimilation. These seemingly unrelated processes are interconnected because circadian regulation drives temporal patterns in nocturnal stomatal conductance, with maximum values occurring immediately before dawn for many species. We grew individuals of six Eucalyptus camaldulensis genotypes in naturally lit glasshouses and measured sunset, predawn and midday leaf gas exchange and whole-plant biomass production. We tested whether sunrise anticipation by the circadian clock and subsequent increases in genotype predawn stomatal conductance led to rapid stomatal opening upon illumination, ultimately affecting genotype differences in carbon assimilation and growth. We observed faster stomatal responses to light inputs at sunrise in genotypes with higher predawn stomatal conductance. Moreover, early morning and midday stomatal conductance and carbon assimilation, leaf area and total plant biomass were all positively correlated with predawn stomatal conductance across genotypes. Our results lead to the novel hypothesis that genotypic variation in the circadian-regulated capacity to anticipate sunrise could be an important factor underlying intraspecific variation in tree growth.
Is part ofPlant Cell and Environment, 2015
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Resco de Dios, Víctor; Loik, Michael E.; Smith, Renee; Tissue, David T. (MDPI, 2018)Nocturnal transpiration constitutes a significant yet poorly understood component of the global water cycle. Modeling nocturnal transpiration has been complicated by recent findings showing that stomata respond differently ...
Resco de Dios, Víctor; Anderegg, William R. L.; Li, Ximeng; Tissue, David T.; Bahn, Michael; Landais, Damien; Milcu, Alexandru; Yao, Yinan; Nolan, Rachael H.; Roy, Jacques; Gessler, Arthur (MDPI, 2020-08-25)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 ...
Night and day - Circadian regulation of night-time dark respiration and light-enhanced dark respiration in plant leaves and canopies Gessler, Arthur; Roy, Jacques; Kayler, Zachary; Ferrio Díaz, Juan Pedro; Alday, Josu G.; Bahn, Michael; Del Castillo, Jorge; Devidal, Sébastien; García-Muñoz, Sonia; Landais, Damien; Martín Gómez, Paula; Milcu, Alexandru; Piel, Clément; Pirhofer Walzl, Karin; Galiano, Lucia; Schaub, Marcus; Haeni, Matthias; Ravel, Olivier; Salekin, Serajis; Tissue, David T.; Tjoelker, Mark G.; Voltas Velasco, Jordi; Hoch, Güter; Resco de Dios, Víctor (Elsevier, 2017)The potential of the vegetation to sequester C is determined by the balance between assimilation and respiration. Respiration is under environmental and substrate-driven control, but the circadian clock might also contribute. ...