Reduced ascorbate pool and its maintenance are important determinants of O damage to net photosynthetic rate in Fagus crenata under elevated CO and soil N supply.

Many studies have reported modification in the degree of O damage to photosynthesis by elevated CO and soil N supply. However, the mechanism underlying the modification is unclear. To clarify the important determinants in the degree of O damage to net photosynthetic rate (A) in the leaves of Fagus crenata (Siebold's beech) under elevated CO and with different soil N supply, F.

Effects of elevated ozone and carbon dioxide on the dynamic photosynthesis of Fagus crenata seedlings under variable light conditions.

Ozone (O) is an air pollutant that is toxic to trees. O reduces steady-state net photosynthetic rate (A), and the adverse effects of O are mitigated under elevated CO condition. However, the combined effects of O and elevated CO on dynamic photosynthesis under variable light conditions have not yet been clarified.

Growth and photosynthetic responses to ozone of Siebold's beech seedlings grown under elevated CO and soil nitrogen supply.

Ozone (O) is a phytotoxic air pollutant, the adverse effects of which on growth and photosynthesis are modified by other environmental factors. In this study, we examined the combined effects of O, elevated CO, and soil nitrogen supply on Siebold's beech seedlings. Seedlings were grown under combinations of two levels of O (low and two times ambient O concentration), two levels of CO (ambient and 700 ppm), and three levels of soil nitrogen supply (0, 50, and 100 kg N ha year) during two growing seasons (2019 and 2020), with leaf photosynthetic traits being determined during the second season.

Metabolomics Analyses Reveal Metabolites Affected by Plant Growth-Promoting Endophytic Bacteria in Roots of the Halophyte .

L. (common ice plant) is an edible halophyte. However, if ice plants are used to phytoremediate salinity soil, there are problems of slow initial growth, and a long period before active NaCl uptake occurs under higher salinity conditions.

Toward an impact assessment of ozone on plant carbon fixation using a process-based plant growth model: A case study of Fagus crenata grown under different soil nutrient levels.

Ozone (O) in the troposphere, an air pollutant with phytotoxicity, is considered as a driver of global warming, because it reduces plant carbon fixation. Recently, a process-based plant growth model has been used in evaluating the O impacts on plants (Schauberger et al., 2019).

Effects of ozone on the growth and yield of rice (Oryza sativa L.) under different nitrogen fertilization regimes.

To examine whether the sensitivity of growth and yield of rice (Oryza sativa L.) to ozone (O) varies under different nitrogen (N) fertilization conditions, rice cultivar 'Koshihikari' was exposed to O under either standard N (SN) fertilization or no N (NN) fertilization. The rice plants were subjected to three gas treatments (charcoal-filtered air (CF) and O at 1.

Ozone changes the linear relationship between photosynthesis and stomatal conductance and decreases water use efficiency in rice.

Ozone is an important air pollutant that affects growth, transpiration, and water use efficiency (WUE) in plants. Integrated models of photosynthesis (A) and stomatal conductance (G) (A-G) are useful tools to consistently assess the impacts of ozone on plant growth, transpiration, and WUE. However, there is no information on how to incorporate the influence of ozone into A-G integrated models for crops.

Mesophyll conductance to CO in leaves of Siebold's beech (Fagus crenata) seedlings under elevated ozone.

Ozone is an air pollutant that negatively affects photosynthesis in woody plants. Previous studies suggested that ozone-induced reduction in photosynthetic rates is mainly attributable to a decrease of maximum carboxylation rate (V) and/or maximum electron transport rate (J) estimated from response of net photosynthetic rate (A) to intercellular CO concentration (C) (A/C curve) assuming that mesophyll conductance for CO diffusion (g) is infinite. Although it is known that C-based V and J are potentially influenced by g, its contribution to ozone responses in C-based V and J is still unclear.

Photosynthetic responses to ozone of upper and lower canopy leaves of Fagus crenata Blume seedlings grown under different soil nutrient conditions.

We aimed to clarify the effects of ozone (O) on photosynthetic ability of upper and lower canopy leaves of Fagus crenata Blume seedlings grown under different soil nutrient conditions. To accomplish this objective, we analyzed the response of photosynthetic parameters such as maximum carboxylation rate (V) to cumulative stomatal O uptake (ΣF) and reduction rate of V per unit ΣF as an index of detoxification capacity for O. The seedlings of Fagus crenata were grown for two growing seasons (2014-2015) in nine treatments comprised of a combination of three levels of gas treatments (charcoal-filtered air or 1.

Modeling of stomatal conductance to estimate stomatal ozone uptake by Fagus crenata, Quercus serrata, Quercus mongolica var. crispula and Betula platyphylla.

To construct stomatal conductance models and estimate stomatal O3 uptake for Fagus crenata, Quercus serrata, Quercus mongolica var. crispula and Betula platyphylla, stomatal conductance (gs) was measured in seedlings of the four tree species. Better estimates of gs were made by incorporating the acute effects of O3 on gs into the models and the models could explain 34-52% of the variability in gs.

Modeling stomatal conductance and ozone uptake of Fagus crenata grown under different nitrogen loads.

A multiplicative stomatal conductance model was constructed to estimate stomatal O3 uptake of Fagus crenata exposed to O3 under different N loads to the soil. Our stomatal conductance model included environmental functions such as the stomatal responses of F. crenata to diurnal changes, chronic O3 stress (AOT0), acute O3 stress (O3 concentration), and nitrogen load to soil.