Interactive effects of ultraviolet radiation and elevated CO2 concentration on photosynthetic characteristics of European beech saplings during the vegetation season

Urban, Otmar; Hrstka, Miroslav; Holub, Petr; Veselá, Barbora; Večeřová, Kristýna; Novotná, Kateřina; Grace, John; Klem, Karel

doi:10.1016/j.plaphy.2018.08.026

Cited by 13 publications

(9 citation statements)

References 42 publications

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“…Our results further show significant effect of tree species (Table 1) on most of the gas-exchange, chlorophyll fluorescence, and biochemical parameters investigated. In accordance with previous studies [6,25,28,[35][36][37], we have found higher CO 2 assimilation rate and capacity in well-watered broadleaved than coniferous trees under ambient [CO 2 ] (Figure 3). Such findings are in agreement with higher values of V C , J, and G Smax in broadleaved saplings (Figures 3 and 5) and document higher strength of carbon sinks in oak as compared to spruce.…”

Section: Species Specificity In Response To Elevated Co 2 and Water Asupporting

confidence: 93%

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Interactive Effect of Elevated CO2 and Reduced Summer Precipitation on Photosynthesis is Species-Specific: The Case Study with Soil-Planted Norway Spruce and Sessile Oak in a Mountainous Forest Plot

Ofori-Amanfo

Klem

Veselá

et al. 2020

Forests

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We investigated how reduced summer precipitation modifies photosynthetic responses of two model tree species—coniferous Norway spruce and broadleaved sessile oak—to changes in atmospheric CO2 concentration. Saplings were grown under mountainous conditions for two growing seasons at ambient (400 μmol CO2 mol–1) and elevated (700 μmol CO2 mol–1) CO2 concentration. Half were not exposed to precipitation during the summer (June–August). After two seasons of cultivation under modified conditions, basic photosynthetic characteristics including light-saturated rate of CO2 assimilation (Amax), stomatal conductance (GSmax), and water use efficiency (WUE) were measured under their growth CO2 concentrations together with in vivo carboxylation rate (VC) and electron transport rate (J) derived from CO2-response curves at saturating light. An increase in Amax under elevated CO2 was observed in oak saplings, whereas it remained unchanged or slightly declined in Norway spruce, indicating a down-regulation of photosynthesis. Such acclimation was associated with an acclimation of both J and VC. Both species had increased WUE under elevated CO2 although, in well-watered oaks, WUE remained unchanged. Significant interactive effects of tree species, CO2 concentration, and water availability on gas-exchange parameters (Amax, GSmax, WUE) were observed, while there was no effect on biochemical (VC, J) and chlorophyll fluorescence parameters. The assimilation capacity (Asat; CO2 assimilation rate at saturating light intensity and CO2 concentration) was substantially reduced in spruce under the combined conditions of water deficiency and elevated CO2, but not in oak. In addition, the stimulatory effect of elevated CO2 on Amax persisted in oak, but completely diminished in water-limited spruce saplings. Our results suggest a strong species-specific response of trees to reduced summer precipitation under future conditions of elevated CO2 and a limited compensatory effect of elevated CO2 on CO2 uptake under water-limited conditions in coniferous spruce.

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Section: Species Specificity In Response To Elevated Co 2 and Water Asupporting

confidence: 93%

“…The efficiency of primary photochemical reactions was determined by chlorophyll fluorescence (Chl-F) following the protocols described in details by Urban et al [25]. In brief, the emission of the Chl-F signal at the red band (near 690 nm) was measured by a fluorometer PAM-2500 (H. Walz, Effeltrich, Germany).…”

Section: Chlorophyll Fluorescencementioning

confidence: 99%

Interactive Effect of Elevated CO2 and Reduced Summer Precipitation on Photosynthesis is Species-Specific: The Case Study with Soil-Planted Norway Spruce and Sessile Oak in a Mountainous Forest Plot

Ofori-Amanfo

Klem

Veselá

et al. 2020

Forests

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“…This seasonality of the eCO 2 effect on C dynamics at leaf and whole-tree level is not limited to young Populus spp. trees, as it has been observed in a variety of tree species, including for instance Eucalyptus globulus (Quentin et al 2015) and Fagus sylvatica (Urban et al 2019) (see Table 1 in Lauriks et al 2020).…”

Section: Early and Late Season Dynamics In The Eco 2 Responsementioning

confidence: 68%

Leaf and tree responses of young European aspen trees to elevated atmospheric CO2 concentration vary over the season

et al. 2021

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Elevated atmospheric CO2 concentration (eCO2) commonly stimulates net leaf assimilation, decreases stomatal conductance and has no clear effect on leaf respiration. However, effects of eCO2 on whole-tree functioning and its seasonal dynamics remain far more uncertain. To evaluate temporal and spatial variability in eCO2 effects, one-year-old European aspen trees were grown in two treatment chambers under ambient (aCO2, 400 ppm) and elevated (eCO2, 700 ppm) CO2 concentrations during an early (spring 2019) and late (autumn 2018) seasonal experiment (ESE and LSE, respectively). Leaf (net carbon assimilation, stomatal conductance and leaf respiration) and whole-tree (stem growth, sap flow and stem CO2 efflux) responses to eCO2 were measured. Under eCO2, carbon assimilation was stimulated during the early (1.63-fold) and late (1.26-fold) seasonal experiments. Stimulation of carbon assimilation changed over time with largest increases observed in spring when stem volumetric growth was highest, followed by late season down-regulation, when stem volumetric growth ceased. The neutral eCO2 effect on stomatal conductance and leaf respiration measured at leaf level paralleled the unresponsive canopy conductance (derived from sap flow measurements) and stem CO2 efflux measured at tree level. Our results highlight that seasonality in carbon demand for tree growth substantially affects the magnitude of the response to eCO2 at both leaf and whole-tree level.

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“…UV-B can induce stomatal closure and thus reduce stomatal conductance [ 33 ], although it can induce stomatal opening [ 34 , 35 , 36 ]. Some studies exhibited increased stomatal conductance by the exclusion of solar UVB [ 37 , 38 ]. The research on trees exhibited that stomatal conductance increased with increased temperature [ 39 ].…”

Section: Discussionmentioning

confidence: 99%

Alchemilla monticola Opiz. Functional Traits Respond to Diverse Alpine Environmental Conditions in Karavanke, Slovenia

Sedej

Turk

2022

Plants

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Alpine plants are exposed to demanding environmental conditions, such as high ultraviolet (UV) and photosynthetic radiation, extreme temperatures, drought, and nutrient deficiencies. Alpine plants adapt and acclimate to harsh conditions, developing several strategies, including biochemical, physiological, and optical responses. However, alpine plants’ survival strategies are hardly researched due to time-consuming and complex experimental conditions, which are supported by scarce studies. Our study focused on the functional traits of the alpine plant Alchemilla monticola Opiz (hairy lady’s mantle) growing at two different altitudes (1500, 2000 m a.s.l.) and two different UV exposures per altitude. Near-ambient (UV) and reduced (UV-) UV radiations were provided by using two sorts of UV absorbing filters; temperatures were monitored hourly. The experimental plots were located at Tegoška Gora, Karavanke, Slovenia. Functional traits: physiological, biochemical, and optical characteristics were recorded three times during the growing season. A. monticola showed high maximum photochemical efficiency at both altitudes throughout the season, which confirms good adaptation and acclimatization of the plant. Furthermore, significantly higher maximum photochemical efficiency at the subalpine altitude coincided with significantly higher UV absorbing compounds (UV AC) contents at the subalpine compared to the montane altitude in August. A. monticola manifested high UV AC contents throughout the season, with significantly increased synthesis of UV AC contents in the subalpine conditions in August and September. The stomatal conductance rate increased with altitude and was correlated mostly to a lower temperature. A. monticola leaves did not transmit any UV spectrum, which corresponded to high total UV AC contents. The leaf transmittance of the photosynthetic spectrum increased at the subalpine altitude, while the transmittance of the green and yellow spectra increased under the reduced UV radiation in the autumn. A. monticola’s high photosynthetic spectrum transmittance at the subalpine altitude in the autumn might therefore be due to subalpine harsh environmental conditions, as well as plant ontogenetical phase.

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Interactive effects of ultraviolet radiation and elevated CO2 concentration on photosynthetic characteristics of European beech saplings during the vegetation season

Cited by 13 publications

References 42 publications

Interactive Effect of Elevated CO2 and Reduced Summer Precipitation on Photosynthesis is Species-Specific: The Case Study with Soil-Planted Norway Spruce and Sessile Oak in a Mountainous Forest Plot

Interactive Effect of Elevated CO2 and Reduced Summer Precipitation on Photosynthesis is Species-Specific: The Case Study with Soil-Planted Norway Spruce and Sessile Oak in a Mountainous Forest Plot

Leaf and tree responses of young European aspen trees to elevated atmospheric CO2 concentration vary over the season

Alchemilla monticola Opiz. Functional Traits Respond to Diverse Alpine Environmental Conditions in Karavanke, Slovenia

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