Table 3. Effect of temperature on stomatal conductance, transpiration rate, vapor pressure deficit of leaf-air and water use efficiency of Salvia miltiorrhiza Bunge exposed to LED at 1,000 μmol/m²/s of photosynthetic photon density, 400 ppm CO₂

Temperature	Stomatal conductance (mmol/m2/s)	Transpiration rate (mmol H2O/m2/s)	Vapor pressure deficit (kPa)	Water use efficiency (μmol CO2/mmol H2O)
20°C	0.035a1)	0.698b	1.918c	7.108a
25°C	0.024b	0.720a	2.848b	4.955b
30°C	0.012c	0.507c	4.023a	3.311b

Values represent the mean (n=3). Means with different letters are significantly different at p<0.05 probability level by Duncan’s multiple range test.