| 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 S22-5  (Presentation in Symposium)

Effects of CO2 environments on photosynthetic induction response in rice and wheat leaves

*Ting ZHU(Peking University, China)

Elevated CO2 (eCO2) is reported to accelerate the photosynthetic induction in response to sudden increases in photon flux density. However, it is still unclear which effect of eCO2 contributes more to the acceleration, more CO2 as substrate or photosynthetic acclimation? particularly in crop species. We grew two crop species, Oryza sativa L. (rice) and Triticum aestivum L. (wheat) in the open-top chambers at 400 and 600 μmol CO2 mol-1 air. We measured the time course of photosynthetic rate after a sudden PFD increase under 400 and 600 μmol CO2 mol-1air, respectively, for plants from both the growth CO2 . The in situ measurements, i.e., measurements conducted under the same CO2 as that during the growth, showed reduced induction time in leaves from the high CO2 than the low CO2. However, the instantaneous eCO2, i.e., eCO2 only during measurement, did not significantly changed the induction time in leaves from different growth CO2. Moreover, in situ eCO2 reduced stomatal opening time in wheat, while instantaneous eCO2 tend to increase the stomatal limitation. These results suggest photosynthetic acclimation, rather than higher CO2 substrate, would accelerate more the photosynthetic induction and the acceleration is mainly due to acclimation of stomatal response.


日本生態学会