Fig. 2.

CO₂ assimilation and bundle‐sheath leakiness during photosynthetic induction of sorghum measured with an LI‐6400XT coupled to a tunable diode laser absorption spectroscope (TDL). (a) CO₂ assimilation rate (A). (b) Bundle‐sheath leakiness (ϕ, Eqn 12). Open dots represent the data points derived from values of observed discrimination that had large uncertainty (the error in the calculated Δ¹³C_obs was > 50% of its calculated value). (c) Stomatal conductance to water vapor (g _s). (d) Intercellular CO₂ concentration (C _i). The dotted vertical lines mark the time of highest leakiness, which was 286 s. t ₁ is the time constant (τ) of the exponential curve for leakiness. Time 0 s is when the light was switched on to 1800 μmol m⁻² s⁻¹. Each data point is the mean (±SE) of eight plants (n = 8).