Figure 1.

Photosynthetic indices under different low−temperature treatments during the anther differentiation period. (a) Net photosynthetic rate changes of cold−tolerant variety. (b) Net photosynthetic rate changes of cold−sensitive variety. (c) Transpiration rate changes of cold−tolerant variety. (d) Transpiration rate changes of cold−sensitive variety. (e) Stomatal conductance changes of cold−tolerant variety. (f) Stomatal conductance changes of cold−sensitive variety. (g) Intercellular CO₂ concentration of cold−tolerant variety. (h) Intercellular CO₂ concentration of cold−sensitive variety. Data represent means ± SE (n = 3).