Fig. 2.

Physiological responses of B. napus under ambient conditions. Photosynthetic assimilation rates of Spring accessions (A) and Semi-Winter accessions (B) were recorded under ambient CO₂ (400 p.p.m.) and light (PAR 500 µmol photons m⁻² s⁻¹) conditions. (C, D) Instantaneous transpiration efficiency was calculated as the ratio of photosynthetic CO₂ assimilation rate to transpiration rate. (E, F) Intrinsic transpiration efficiency was calculated as the ratio of photosynthetic CO₂ assimilation rate to stomatal conductance. Error bars denote the SEM. Statistical values for differences within categories were calculated using a one-way ANOVA followed by Tukey’s multiple comparisons test.