Fig. 1

Physiological traits of Z. xanthoxylum in response to different heat treatments. (a) growth status, (b) plant height, (c) leaf area, (d) relative growth rate, (e) fresh weight, (f) dry weight, (g) chlorophyll concentration, (h) net photosynthetic rate (Pn), (i) stomatal conductance (Gs) and (j) transpiration rate (Tr) of Z. xanthoxylum under different heat treatments for 10 days (6 h/d). The time of the beginning of the light phase of the day is 6:00 o’clock. Scale bars in (A) = 10 cm. Values in (b-j) are the means ± SE (n = 5). Asterisks indicate significant differences in comparison with control (25 °C) (* P < 0.05, ** P < 0.01, *** P < 0.001, Student’s t-test)