Limited mitigating effects of elevated CO2 in young aspen trees to face drought stress

Lauriks, Fran; Salomón, Roberto L.; Roo, Linus De; Sobrino-Plata, Juan; Rodríguez-García, Aida; Steppe, Kathy

doi:10.1016/j.envexpbot.2022.104942

Cited by 7 publications

(7 citation statements)

References 60 publications

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“…This suggests structural C depletion and likely reserved conversion of structural carbohydrates towards the nonstructural forms. This is evidence of resistance to drought by reserving sugar and starch post-mowing because the depletion of nonstructured carbohydrates is an immediate response to provide energy to fuel enzymic activity ( Wei and Guo, 2017 ; Lauriks et al., 2022 ).…”

Section: Discussionmentioning

confidence: 99%

Forage quality and physiological performance of mowed alfalfa (Medicago sativa L.) subjected to combined light quality and drought

Zhao

Wang

et al. 2022

Front. Plant Sci.

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Alfalfa (Medicago sativa) can dwell in water-deficient habitats, where it is difficult to predict dry mass (DM) production and forage quality due to understory transmittance. Mowing is a recommended practice for alfalfa populations under drought, but its effect on forested land receives less attention. In a controlled indoor experiment, we found that drought better reduces shoot DM weight and crude fiber content (CFi) in blue light (33.7% red, 48.5% green, and 17.8% blue lights) than red light (71.7% red, 13.7% green, and 14.6% blue lights). Mowing decreases carbon (C) isotope signature (δ13C), CFi, and total C content in shoots but increases their accumulations in DM, nonstructural carbohydrates, and crude fat content (CFa). The results also demonstrated that mown alfalfa has higher starch content when exposed to green light (26.2% red, 56.4% green, and 17.4% blue lights) compared to the other two spectra. Multiple factorial regression indicated that higher soluble sugar content accounted for the increase of CFa and DM weight for CFi. Overall, mowing in blue-light–enriched understory stands is recommended and produces high-forage–quality alfalfa, which can be used as a lowered crude fiber component.

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Section: Discussionmentioning

confidence: 99%

Forage quality and physiological performance of mowed alfalfa (Medicago sativa L.) subjected to combined light quality and drought

Zhao

Wang

et al. 2022

Front. Plant Sci.

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“…1 ). This coordination explains observations of more aggressive water use and accelerated declines in ψ and water content in NSC-depleted plants ( O’Brien et al 2014 ; Sapes et al 2019 ) and in defoliated trees ( Salmon et al 2015 , which stored fewer stem NSCs; Poyatos et al 2013 ) as well as heightened stomatal sensitivity to elevated CO 2 concentrations (eCO 2 ) at the beginning of the growing season when NSC demands are high ( Quentin et al 2015 ; Urban et al 2019 ; Sanches et al 2020 ; Lauriks et al 2021 b , 2022 ). Alternatively, stomata should close, deprioritizing carbon gain, even when water is available, if growth is sink limited ( Blonder et al 2023 ).…”

Section: Introductionmentioning

confidence: 72%

“…The carbon-use strategy can explain why maximal photosynthetic stimulation by eCO 2 and coinciding heightened stomatal sensitivity typically occur at the beginning of the growing season (low χ w during the early growing season in Fig. 2 ; Quentin et al 2015 ; Urban et al 2019 ; Sanches et al 2020 ; Lauriks et al 2021 b , 2022 ) when NSCs deplete to meet growth demands ( Palacio et al 2018 ; Tixier et al 2020 ). Since larger seasonal NSC fluctuations occur in more seasonal climates ( Fermaniuk et al 2021 ), we expect seasonal variations in photosynthetic and stomatal sensitivity to eCO 2 to be pronounced in boreal ecosystems.…”

Section: Discussionmentioning

confidence: 99%

Dynamically optimizing stomatal conductance for maximum turgor-driven growth over diel and seasonal cycles

Potkay

Feng

2023

AoB PLANTS

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SUMMARY Stomata have recently been theorized to have evolved strategies that maximize turgor-driven growth over plants’ lifetimes, finding support through steady-state solutions, in which gas exchange, carbohydrate storage, and growth have all reached an equilibrium. However, plants do not operate near steady-state as plant responses and environmental forcings vary diurnally and seasonally. It remains unclear how gas exchange, carbohydrate storage, and growth should be dynamically coordinated for stomata to maximize growth. We simulated the gas exchange, carbohydrate storage, and growth that dynamically maximize growth diurnally and annually. Additionally, we test whether the growth-optimization hypothesis explains nocturnal stomatal opening, particularly through diel changes in temperature, carbohydrate storage, and demand. Yearlong dynamic simulations captured realistic diurnal and seasonal patterns in gas exchange as well as realistic seasonal patterns in carbohydrate storage and growth, improving upon unrealistic carbohydrate responses in steady-state simulations. Diurnal patterns of carbohydrate storage and growth in daylong simulations were hindered by faulty modeling assumptions of cyclic carbohydrate storage over an individual day and synchronization of the expansive and hardening phases of growth, respectively. The growth-optimization hypothesis cannot currently explain nocturnal stomatal opening unless employing corrective ‘fitness factors’ or reframing the theory in a probabilistic manner, in which stomata adopt an inaccurate statistical ‘memory’ of nighttime temperature. The growth-optimization hypothesis suggests that diurnal and seasonal patterns of stomatal conductance are driven by a dynamic carbon-use strategy that seeks to maintain homeostasis of carbohydrate reserves.

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“…Elevated CO 2 and associated climate change affect plant growth and distribution through via influencing physiological processes ( Lauriks et al., 2022 ; Ma et al., 2023 ). Elevated CO 2 usually causes photosynthetic adaptation, which is typically manifested by decreases in photosynthetic capacity ( V cmax , J max ), N area and g s ( Hao et al., 2023 ), but promotes biomass production and photosynthetic rate ( Dusenge et al., 2020 ; Tcherkez et al., 2020 ).…”

Section: Discussionmentioning

confidence: 99%

Elevated CO2 and ammonium nitrogen promoted the plasticity of two maple in great lakes region by adjusting photosynthetic adaptation

Wang,

Dang

2024

Front. Plant Sci.

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IntroductionClimate change-related CO2 increases and different forms of nitrogen deposition are thought to affect the performance of plants, but their interactions have been poorly studied.MethodsThis study investigated the responses of photosynthesis and growth in two invasive maple species, amur maple (Acer ginnala Maxim.) and boxelder maple (Acer negundo L.), to elevated CO2 (400 µmol mol-1 (aCO2) vs. 800 µmol mol-1 (eCO2) and different forms of nitrogen fertilization (100% nitrate, 100% ammonium, and an equal mix of the two) with pot experiment under controlled conditions.Results and discussionThe results showed that eCO2 significantly promoted photosynthesis, biomass, and stomatal conductance in both species. The biochemical limitation of photosynthesis was switched to RuBP regeneration (related to Jmax) under eCO2 from the Rubisco carboxylation limitation (related to Vcmax) under aCO2. Both species maximized carbon gain by lower specific leaf area and higher N concentration than control treatment, indicating robust morphological plasticity. Ammonium was not conducive to growth under aCO2, but it significantly promoted biomass and photosynthesis under eCO2. When nitrate was the sole nitrogen source, eCO2 significantly reduced N assimilation and growth. The total leaf N per tree was significantly higher in boxelder maple than in amur maple, while the carbon and nitrogen ratio was significantly lower in boxelder maple than in amur maple, suggesting that boxelder maple leaf litter may be more favorable for faster nutrient cycling. The results suggest that increases in ammonium under future elevated CO2 will enhance the plasticity and adaptation of the two maple species.

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Limited mitigating effects of elevated CO2 in young aspen trees to face drought stress

Cited by 7 publications

References 60 publications

Forage quality and physiological performance of mowed alfalfa (Medicago sativa L.) subjected to combined light quality and drought

Forage quality and physiological performance of mowed alfalfa (Medicago sativa L.) subjected to combined light quality and drought

Dynamically optimizing stomatal conductance for maximum turgor-driven growth over diel and seasonal cycles

Elevated CO2 and ammonium nitrogen promoted the plasticity of two maple in great lakes region by adjusting photosynthetic adaptation

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