Correlation coefficient between transpiration efficiency related traits and yield.

Asterisks represent significant differences. * P< 0.05; ** P< 0.01. SD: stomatal density (No. mm-2); FLA: flag leaf area (cm2); A: photosynthetic rate (μmol. m-2 s-1); gs: stomatal conductance (mmol. m-2 s-1); E: transpiration rate (mmol. m-2 s-1); WUEi: instant water use efficiency (μmol. mmol-1); CID: carbon isotopic discrimination (‰); BYPP: biomass yield per plant (g); GYPP: grain yield per plant (g); HI: harvest index. Correlation coefficient between transpiration efficiency related traits and yield.