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

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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
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)
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)

Submitter: 小池 孝良

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