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Interactive effect of leaf age and ozone on mesophyll conductance in Siebold's beech
Title: | Interactive effect of leaf age and ozone on mesophyll conductance in Siebold's beech |
Authors: | Hoshika, Yasutomo Browse this author | Haworth, Matthew Browse this author | Watanabe, Makoto Browse this author | Koike, Takayoshi Browse this author →KAKEN DB |
Keywords: | PHOTOSYNTHETIC ELECTRON-TRANSPORT | BIRCH BETULA-PENDULA | DIFFUSION CONDUCTANCE | STOMATAL CLOSURE | CHLOROPHYLL FLUORESCENCE | SPECIFICITY FACTOR | ISOPRENE EMISSION | QUANTUM YIELD | CO2 DIFFUSION | FAGUS-CRENATA |
Issue Date: | Oct-2020 |
Publisher: | John Wiley & Sons |
Journal Title: | Physiologia Plantarum |
Volume: | 170 |
Issue: | 2 |
Start Page: | 172 |
End Page: | 186 |
Publisher DOI: | 10.1111/ppl.13121 |
Abstract: | Mesophyll conductance (G(m)) is one of the most important factors determining photosynthesis. Tropospheric ozone (O-3) is known to accelerate leaf senescence and causes a decline of photosynthetic activity in leaves. However, the effects of age-related variation of O-3 on G(m) have not been well investigated, and we, therefore, analysed leaf gas exchange data in a free-air O-3 exposure experiment on Siebold's beech with two levels (ambient and elevated O-3: 28 and 62 nmol mol(-1) as daylight average, respectively). In addition, we examined whether O-3-induced changes on leaf morphology (leaf mass per area, leaf density and leaf thickness) may affect CO2 diffusion inside leaves. We found that O-3 damaged the photosynthetic biochemistry progressively during the growing season. The G(m) was associated with a reduced photosynthesis in O-3-fumigated Siebold's beech in August. The O-3-induced reduction of G(m) was negatively correlated with leaf density, which was increased by elevated O-3, suggesting that the reduction of G(m) was accompanied by changes in the physical structure of mesophyll cells. On the other hand, in October, the O-3-induced decrease of G(m) was diminished because G(m) decreased due to leaf senescence regardless of O-3 treatment. The reduction of photosynthesis in senescent leaves after O-3 exposure was mainly due to a decrease of maximum carboxylation rate (V-cmax) and/or maximum electron transport rate (J(max)) rather than diffusive limitations to CO2 transport such as G(m). A leaf agexO(3) interaction of photosynthetic response will be a key for modelling photosynthesis in O-3-polluted environments. |
Rights: | This is the peer reviewed version of the following article: Interactive effect of leaf age and ozone on mesophyll conductance in Siebold's beech, which has been published in final form at 10.1111/ppl.13121. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving. |
Type: | article (author version) |
URI: | http://hdl.handle.net/2115/82826 |
Appears in Collections: | 農学院・農学研究院 (Graduate School of Agriculture / Faculty of Agriculture) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 小池 孝良
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