Model-based analysis of avoidance of ozone stress by stomatal closure in Siebold's beech (Fagus crenata)

Hoshika, Yasutomo; Watanabe, Makoto; Inada, Naoki; Koike, Takao

doi:10.1093/aob/mct166

Cited by 60 publications

(61 citation statements)

References 69 publications

(67 reference statements)

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“…Although there was no difference of C i / C a between gas treatments in June and August, the C i / C a under elevated O 3 condition in October was higher than that under ambient condition. Hoshika et al (2013) also reported elevated O 3 -induced higher C i / C a in late growing season in Siebold's beech sapling at the same experimental site with the present study, indicating O 3 -induced acceleration of the loss of stomatal control with leaf age, called the 'stomatal sluggishness' (Paoletti and Grulke, 2010;Hoshika et al, 2012a).…”

Section: Resultssupporting

confidence: 86%

Difference in photosynthetic responses to free air ozone fumigation between upper and lower canopy leaves of Japanese oak (Quercus mongolica var. crispula) saplings

Watanabe

Hoshika

Inada

et al. 2015

J. Agric. Meteorol.

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To clarify the difference of ozone (O 3 ) sensitivity of photosynthesis in leaves located different canopy positions, we investigated photosynthetic responses of Japanese oak saplings to free air O 3 exposure, and compared the results with Siebold's beech saplings reported previously. The O 3 at 60 nmol mol -1 during daytime was fumigated for two growing seasons, from 6 August to 11 November 2011 and from 17 May to 10 November 2012. In June, August and October of 2012, we determined photosynthetic activity of upper and lower canopy leaves. The exposure to O 3 increased the ratio of intercellular CO 2 concentration to ambient CO 2 concentration in October, indicating stomatal sluggishness. We observed an O 3 -induced, significant decrease in light-saturated net photosynthetic rate (A sat ) with no significant interaction between O 3 effect and canopy position for A sat . Therefore, we conclude that the O 3 sensitivity of photosynthesis in upper and lower canopy leaves was similar in Japanese oak, while our previous study reported that the upper canopy leaves of Siebold's beech have a higher O 3 sensitivity than lower canopy leaves.

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Section: Resultssupporting

confidence: 86%

Difference in photosynthetic responses to free air ozone fumigation between upper and lower canopy leaves of Japanese oak (Quercus mongolica var. crispula) saplings

Watanabe

Hoshika

Inada

et al. 2015

J. Agric. Meteorol.

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“…Hoshika et al (2013) show a significant difference in the g 1 parameter (higher in elevated O 3 compared to ambient) in Siebold's beech in June of their experiment. However, this is only at the start of the growing season; further measurements show no difference in this parameter among O 3 treatments.…”

Section: Impacts Of O 3 At the Land Surfacementioning

confidence: 76%

Large but decreasing effect of ozone on the European carbon sink

et al. 2018

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Abstract. The capacity of the terrestrial biosphere to sequester carbon and mitigate climate change is governed by the ability of vegetation to remove emissions of CO 2 through photosynthesis. Tropospheric O 3 , a globally abundant and potent greenhouse gas, is, however, known to damage plants, causing reductions in primary productivity. Despite emission control policies across Europe, background concentrations of tropospheric O 3 have risen significantly over the last decades due to hemispheric-scale increases in O 3 and its precursors. Therefore, plants are exposed to increasing background concentrations, at levels currently causing chronic damage. Studying the impact of O 3 on European vegetation at the regional scale is important for gaining greater understanding of the impact of O 3 on the land carbon sink at large spatial scales. In this work we take a regional approach and update the JULES land surface model using new measurements specifically for European vegetation. Given the importance of stomatal conductance in determining the flux of O 3 into plants, we implement an alternative stomatal closure parameterisation and account for diurnal variations in O 3 concentration in our simulations. We conduct our analysis specifically for the European region to quantify the impact of the interactive effects of tropospheric O 3 and CO 2 on gross primary productivity (GPP) and land carbon storage across Europe. A factorial set of model experiments showed that tropospheric O 3 can suppress terrestrial carbon uptake across Europe over the period 1901 to 2050. By 2050, simulated GPP was reduced by 4 to 9 % due to plant O 3 damage and land carbon storage was reduced by 3 to 7 %. The combined physiological effects of elevated future CO 2 (acting to reduce stomatal opening) and reductions in O 3 concentrations resulted in reduced O 3 damage in the future. This alleviation of O 3 damage by CO 2 -induced stomatal closure was around 1 to 2 % for both land carbon and GPP, depending on plant sensitivity to O 3 . Reduced land carbon storage resulted from diminished soil carbon stocks consistent with the reduction in GPP. Regional variations are identified with larger impacts shown for temperate Europe (GPP reduced by 10 to 20 %) compared to boreal regions (GPP reduced by 2 to 8 %). These results highlight that O 3 damage needs to be considered when predicting GPP and land carbon, and that the effects of O 3 on plant physiology need to be considered in regional land carbon cycle assessments.

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“…At a moderate level of chronic O 3 exposure, O 3 -induced decline of photosynthetic capacity may therefore cause stomatal closure (Reich, 1987;Farage and Long, 1995;Heath and Taylor, 1997). However, free-air O 3 exposure experiments showed that such O 3 -induced stomatal closure was diminished in European and Seibold's beech (Fagus sylvatica and Fagus crenata, respectively) during the late growing season, although O 3 decreased photosynthetic capacity (Löw et al, 2007;Hoshika et al, 2013b). The observation here implies a decoupling of stomatal conductance and photosynthesis after O 3 exposure.…”

Section: Discussionmentioning

confidence: 99%

Determinants of stomatal sluggishness in ozone-exposed deciduous tree species

Hoshika

Carriero

Zhu

et al. 2014

Science of The Total Environment

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• Our knowledge of ozone (O 3 ) effects on dynamic stomatal response is still limited.• Determinants of O 3 -induced stomatal sluggishness were examined in deciduous tree species in open-top chambers.• Ozone exposure slowed closing of stomata after leaf cutting.• Stomatal sluggishness was well explained by stomatal O 3 flux per net photosynthesis.• Stomatal sluggishness depended both on ozone flux and on the capacity for detoxification or repair. a b s t r a c t a r t i c l e i n f o Our knowledge of ozone effects on dynamic stomatal response is still limited, especially in Asian tree species. We thus examined ozone effects on steady-state leaf gas exchange and stomatal dynamics in three common tree species of China (Ailanthus altissima, Fraxinus chinensis and Platanus orientalis). Seedlings were grown and were exposed to three levels of ozone in open-top chambers (42, 69, 100 nmol mol −1 daylight average, from 09:00 to 18:00). At steady-state, ozone exposure induced an uncoupling of photosynthesis and stomatal conductance, as the former decreased while the latter did not. Dynamic stomatal response was investigated by cutting the leaf petiole after a steady-state stomatal conductance was reached. Ozone exposure increased stomatal sluggishness, i.e., slowed stomatal response after leaf cutting, in the following order of sensitivity, F. chinensis N A. altissima N P. orientalis. A restriction of stomatal ozone flux reduced the ozone-induced sluggishness in P. orientalis. The ozone-induced impairment of stomatal control was better explained by stomatal ozone flux per net photosynthesis rather than by stomatal ozone flux only. This suggests that ozone injury to stomatal control depends both on the amount of ozone entering a leaf and on the capacity for biochemical detoxification or repair. Leaf mass per area and the density of stomata did not affect stomatal sluggishness.

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Model-based analysis of avoidance of ozone stress by stomatal closure in Siebold's beech (Fagus crenata)

Abstract: Ozone-induced stomatal closure in Siebold's beech during early summer reduces ozone influx and allows the maximum photosynthetic capacity to be reached, but is not sufficient in older leaves to protect the photosynthetic system.

Cited by 60 publications

References 69 publications

Difference in photosynthetic responses to free air ozone fumigation between upper and lower canopy leaves of Japanese oak (<i>Quercus mongolica</i> var. <i>crispula</i>) saplings

Difference in photosynthetic responses to free air ozone fumigation between upper and lower canopy leaves of Japanese oak (<i>Quercus mongolica</i> var. <i>crispula</i>) saplings

Large but decreasing effect of ozone on the European carbon sink

Determinants of stomatal sluggishness in ozone-exposed deciduous tree species

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