Water use strategy affects avoidance of ozone stress by stomatal closure in Mediterranean trees—A modelling analysis

Hoshika, Yasutomo; Fares, Silvano; Pellegrini, Elisa; Conte, Adriano Mosca; Paoletti, Elena

doi:10.1111/pce.13700

Cited by 36 publications

(35 citation statements)

References 68 publications

(99 reference statements)

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“…Kitao et al (2009) reported a strong decrease of stomatal conductance in this species during O 3 exposure, which may be a primary cause of the reduction of photosynthetic activity. At the same time, a decrease of stomatal conductance may reduce stomatal O 3 flux to leaves, thus limiting the O 3 damages to photosynthetic systems in mesophyll cells (Hoshika, Fares, et al, 2020a). In fact, Warren et al (2007) pointed that the difference in stomatal O 3 flux was relatively small between control (ambient O 3 ) and elevated O 3 (twice ambient O 3 ) treatments in a deciduous F. sylvatica due to an O 3 ‐induced stomatal closure.…”

Section: Discussionmentioning

confidence: 99%

“…Cotrozzi et al, 2016). In fact, the combination of O 3 and drought may cause the generation of excessive reactive oxygen species (ROS), and may thus overwhelm the detoxification capacity of plants (Alonso et al, 2001; Cotrozzi et al, 2016; Hoshika, Fares, et al, 2020a). Reactive oxygen species have been proposed to function as secondary messengers in ABA signalling in plant cells (Vainonen & Kangasjärvi, 2015).…”

Section: Introductionmentioning

confidence: 99%

“…Ozone causes stomatal closure due to the increased production of phytohormones such as abscisic acid (ABA) (Kangasjärvi et al, 2005;McAdam et al, 2017). In addition, several studies indicate that O 3 may also cause a reduction of mesophyll conductance ( g mCO2 ) as reported in snap bean (Flowers et al, 2007), poplars (Xu et al, 2019) and beech trees (Hoshika, Fares, et al, 2020a;Watanabe et al, 2018) although Warren et al (2007) did not find such an effect of O 3 on g mCO2 in Fagus sylvatica. Mesophyll conductance ( g mCO2 ) consists of both physical and biochemical components in the transport of CO 2 (Flexas et al, 2008;Loreto et al, 1992).…”

Section: Introductionmentioning

confidence: 99%

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Species‐specific variation of photosynthesis and mesophyll conductance to ozone and drought in three Mediterranean oaks

Hoshika

Paoletti

Centritto

et al. 2022

Physiologia Plantarum

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Mesophyll conductance (gmCO2) is one of the most important components in plant photosynthesis. Tropospheric ozone (O3) and drought impair physiological processes, causing damage to photosynthetic systems. However, the combined effects of O3 and drought on gmCO2 are still largely unclear. We investigated leaf gas exchange during mid‐summer in three Mediterranean oaks exposed to O3 (ambient [35.2 nmol mol−1 as daily mean]; 1.4 × ambient) and water treatments (WW [well‐watered] and WD [water‐deficit]). We also examined if leaf traits (leaf mass per area [LMA], foliar abscisic acid concentration [ABA]) could influence the diffusion of CO2 inside a leaf. The combination of O3 and WD significantly decreased net photosynthetic rate (PN) regardless of the species. The reduction of photosynthesis was associated with a decrease in gmCO2 and stomatal conductance (gsCO2) in evergreen Quercus ilex, while the two deciduous oaks (Q. pubescens, Q. robur) also showed a reduction of the maximum rate of carboxylation (Vcmax) and maximum electron transport rate (Jmax) with decreased diffusive conductance parameters. The reduction of gmCO2 was correlated with increased [ABA] in the three oaks, whereas there was a negative correlation between gmCO2 with LMA in Q. pubescens. Interestingly, two deciduous oaks showed a weak or no significant correlation between gsCO2 and ABA under high O3 and WD due to impaired stomatal physiological behaviour, indicating that the reduction of PN was related to gmCO2 rather than gsCO2. The results suggest that gmCO2 plays an important role in plant carbon gain under concurrent increases in the severity of drought and O3 pollution.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Species‐specific variation of photosynthesis and mesophyll conductance to ozone and drought in three Mediterranean oaks

Hoshika

Paoletti

Centritto

et al. 2022

Physiologia Plantarum

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“…For example, the leaf area and related physiological processes depend on individual competition, which could be introduced to models to obtain a better individual performance estimate (Pace et al 2018). On the process level, the interaction between ozone and the stomatal conductance might be introduced, that is, the decrease of the stomatal control under high ozone concentrations (Hoshika et al 2018(Hoshika et al , 2020. The introduction of such a feature would also provide the means for considering the potential positive effects of reduced ozone concentrations on the water balances.…”

Section: Discussionmentioning

confidence: 99%

A single tree model to consistently simulate cooling, shading, and pollution uptake of urban trees

et al. 2020

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Extremely high temperatures, which negatively affect the human health and plant performances, are becoming more frequent in cities. Urban green infrastructure, particularly trees, can mitigate this issue through cooling due to transpiration, and shading. Temperature regulation by trees depends on feedbacks among the climate, water supply, and plant physiology. However, in contrast to forest or general ecosystem models, most current urban tree models still lack basic processes, such as the consideration of soil water limitation, or have not been evaluated sufficiently. In this study, we present a new model that couples the soil water balance with energy calculations to assess the physiological responses and microclimate effects of a common urban street-tree species (Tilia cordata Mill.) on temperature regulation. We contrast two urban sites in Munich, Germany, with different degree of surface sealing at which microclimate and transpiration had been measured. Simulations indicate that differences in wind speed and soil water supply can be made responsible for the differences in transpiration. Nevertheless, the calculation of the overall energy balance showed that the shading effect, which depends on the leaf area index and canopy cover, contributes the most to the temperature reduction at midday. Finally, we demonstrate that the consideration of soil water availability for stomatal conductance has realistic impacts on the calculation of gaseous pollutant uptake (e.g., ozone). In conclusion, the presented model has demonstrated its ability to quantify two major ecosystem services (temperature mitigation and air pollution removal) consistently in dependence on meteorological and site conditions.

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“…3D), although a significant relationship has been previously found between G sH2O and G m (Lloyd et al 1992, Lauteri et al 2014). Although stomata generally regulate CO 2 uptake, several studies have shown evidence that chronic O 3 exposure impairs efficient stomatal control of gas exchange (Paoletti 2005, Hoshika et al 2019, 2020).…”

Section: Discussionmentioning

confidence: 99%

Interactive effect of leaf age and ozone on mesophyll conductance in Siebold's beech

Hoshika

Haworth

Watanabe

et al. 2020

Physiologia Plantarum

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Mesophyll conductance (Gm) is one of the most important factors determining photosynthesis. Tropospheric ozone (O3) is known to accelerate leaf senescence and causes a decline of photosynthetic activity in leaves. However, the effects of age‐related variation of O3 on Gm have not been well investigated, and we, therefore, analysed leaf gas exchange data in a free‐air O3 exposure experiment on Siebold's beech with two levels (ambient and elevated O3: 28 and 62 nmol mol−1 as daylight average, respectively). In addition, we examined whether O3‐induced changes on leaf morphology (leaf mass per area, leaf density and leaf thickness) may affect CO2 diffusion inside leaves. We found that O3 damaged the photosynthetic biochemistry progressively during the growing season. The Gm was associated with a reduced photosynthesis in O3‐fumigated Siebold's beech in August. The O3‐induced reduction of Gm was negatively correlated with leaf density, which was increased by elevated O3, suggesting that the reduction of Gm was accompanied by changes in the physical structure of mesophyll cells. On the other hand, in October, the O3‐induced decrease of Gm was diminished because Gm decreased due to leaf senescence regardless of O3 treatment. The reduction of photosynthesis in senescent leaves after O3 exposure was mainly due to a decrease of maximum carboxylation rate (Vcmax) and/or maximum electron transport rate (Jmax) rather than diffusive limitations to CO2 transport such as Gm. A leaf age×O3 interaction of photosynthetic response will be a key for modelling photosynthesis in O3‐polluted environments.

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Water use strategy affects avoidance of ozone stress by stomatal closure in Mediterranean trees—A modelling analysis

Cited by 36 publications

References 68 publications

Species‐specific variation of photosynthesis and mesophyll conductance to ozone and drought in three Mediterranean oaks

Species‐specific variation of photosynthesis and mesophyll conductance to ozone and drought in three Mediterranean oaks

A single tree model to consistently simulate cooling, shading, and pollution uptake of urban trees

Interactive effect of leaf age and ozone on mesophyll conductance in Siebold's beech

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