Fig. 1

The physiological changes of three pines under drought and rehydration. A Total antioxidant capacity (TAOC); B Soluble proteins (SP); C Soluble sugars (SS); D Starch; E Non-structural carbohydrate (NSC); F Peroxidase (POD) activity; G Malondialdehyde (MDA) content; H Chlorophyll a (Chla); I Chlorophyll b (Chlb); J The relative change rate of indicators compared to CK at different time points (ratio = (Value_(point)—Value_(CK))/Value_(CK)); K PCA analysis. Note: In (A–I), 7-35D represented drought treatment after 7 D, 14D, 21D, 28D, and 35D. Re7D represented 7 D after rehydration; error bars indicated the standard deviation, the number of seedlings measured for each species was n = 3; the left Y-axis represented value of physiological traitors, “CK” group of each species was set as a reference to compare the mean by the Student's t-Test, “ns” means no difference,”*” P ≤ 0.05;”**” P ≤ 0.01;”***” P ≤ 0.001;”****” P ≤ 0.0001. A least significant difference test (LSD) was used at a probability level of 0.05 to verify the significance between species at sample point