| 要旨トップ | 本企画の概要 | 日本生態学会第67回全国大会 (2020年3月、名古屋) 講演要旨
ESJ67 Abstract


シンポジウム S22-3  (Presentation in Symposium)

Short-term changes of temperature affect significantly photosynthetic induction response

*Yixin MA(Peking University, China)

Terrestrial plants experience drastic temporal changes in photosynthetic photon flux density (PPFD) in the field, and photosynthesis in response to changing PPFD, i.e., dynamic photosynthesis, is affected by temperature. However, compared to knowledge on photosynthesis under constant PPFD, we know much less about dynamic photosynthetic response to temperature, particularly its temperature acclimation. Addressing this question will improve our understanding of dynamic photosynthesis under different temperature conditions, particularly temperature elevation in the future.
In this study, we examined leaf photosynthesis in Populus koreana × trichocarpa cv. Peace at four measurement temperatures (15°C, 20°C, 25°C, 30°C) for plants grown at four growth temperatures (15°C, 20°C, 25°C, 30°C). Using the species with little stomatal response to varying PPFD, we found that the steady-state photosynthetic characteristics including Vcmax, Jmax, steady-state photosynthetic rate changed pronouncedly with growth temperature. However, the dynamic photosynthetic characteristics including t50 and 1/τ (both indicating the velocity of photosynthetic induction) exhibited a clearer trend along measurement than growth temperature gradient, though they showed higher temperature optimum and lower sensitivity at higher growth temperature.
These results suggest that compared to steady-state photosynthesis, measurement temperature, i.e., instantaneous changes of environmental temperature, would have a stronger impact on dynamic photosynthesis than growth temperature.


日本生態学会