Figure legends
Figure 1. The temperature response of photosynthesis at 400 ppm CO2 (P400; left-hand panels) and at 800 ppm CO2 (P800; right hand panels) ofTabebuia rosea plants, as affected by growth conditions. Panels a and b show the effect of growth at elevated temperature and [CO2] relative to control plants grown at ambient conditions; effects of short-term transfer from control to treatment (c, d), and from treatment to control conditions (e, f) are also shown. Curves were fitted with Eqn 6 with MCMC sampler (4000 iterations, 100 random samples are plotted). TOpt is indicated in solid lines for control (blue) and treatment (red) plants; dashed lines indicate the 5 and 95% percentiles of the credible interval of TOpt.
Figure 2. Posterior distributions of TOpt of P400 (a), P800 (b), VCMax (c), and JMax (d), with highlighted 50, 90, and 99% credible intervals.
Figure 3. Maximum RuBP carboxylation capacity (left-hand panels) and maximum electron transport rate (right-hand panels) in relation to leaf temperature in Tabebuia rosea plants. Panels a and b show the effect of growth at elevated temperature and [CO2] relative to control plants grown at ambient conditions; effects of short-term transfer from control to treatment (c, d), and from treatment to control conditions (e, f) are also shown. Curves were fitted with Eqn 3 with MCMC ( iterations). TOpt is indicated in solid lines for control (blue) and treatment (red) plants; dashed lines indicate the 5 and 95% percentiles of the credible interval of TOpt.
Figure 4. JMax to VCMax ratio in relation to leaf temperature in Tabebuia rosea plants grown at ambient conditions and plants grown at elevated temperature and [CO2] conditions (a). Also shown are JMax to VCMax ratios of control plants before and after they were transferred to treatment conditions (b) and of treatment plants before and after they were transferred to control conditions (c).
Figure 5. Stomatal conductance (gs) in relation to leaf temperature (left-hand panels) and leaf-to-air vapor pressure deficit (VPD) (right-hand panels) in Tabebuia rosea plants grown at ambient conditions and plants grown at elevated temperature and [CO2] conditions (top). Also shown are relationships of control plants before and after they were transferred to treatment conditions (center) and of treatment plants before and after they were transferred to control conditions (bottom).
Figure 6. Stomatal limitation of net photosynthesis determined with Eqn 7 in relation to temperature in Tabebuia rosea plants grown at ambient (control) and at elevated temperature and [CO2] (left-hand panels), and plants that were transferred from control to treatment and from treatment to control conditions (right-hand panels). Complete suppression of photosynthesis by low stomatal conductance would yield an l of 1.0, whereas 0 indicates that measured photosynthesis is identical to what it would be under infinite stomatal conductance.
Figure 7. Dark respiration rates in relation to leaf temperature in Tabebuia rosea plants grown at ambient conditions and plants grown at elevated temperature and [CO2] conditions (a). Also shown are respiration rates of control plants before and after they were transferred to treatment conditions (b) and of treatment plants before and after they were transferred to control conditions (c) Curves were fitted to the data pooled across 4–5 plants per treatment with Eqn 2 with MCMC (100 random samples of which are plotted).
Table 1. Leaf mass per area (LMA), concentrations of leaf nitrogen (N) and carbon (C), and nitrogen concentration per unit leaf area (NArea) for Tabebuia rosea plants (n = 4) grown at ambient (Control) and elevated temperature and CO2 concentration (Treatment), and then transferred from control to treatment conditions and vice versa before being re-measured after >7 days.