AI+200 and AI+160 were short-term (one growing season) abrupt increase of [CO2] by ~200 μmol mol-1 and ~160 μmol mol-1, respectively. CI: constant increase of [CO2] by ~200 μmol mol-1 based on ambient [CO2] for four generations. SI: stepwise increase of [CO2] for four generations with the [CO2] being ~40, 80, 120 and 160 μmol mol-1 higher than ambient in each generation. Data is the relative change of Fv/Fm (n=12) from predawn to other moments calculated from equation 1.
Table 4 Correlation coefficient between quantum yield for electron transport (φEo) and maximum photochemical efficiency PS II (Fv/Fm) and probability that trapped exciton moves an electron further than QA-o) under different treatments of elevated CO2 concentration [CO2].