Fig. 1

Growth of nettle under drought stress. CK, TL and TH represent the control, low-gradient drought stress and high-gradient drought stress treatments, respectively, and 0 d, 1 d, 4 d, and 8 d represent different days. CK0d: control on day 0; CK1d: control on day 1; CK4d: control on day 4; CK8d: control on day 8; TL0d: lower drought stress on day 0; TL1d: lower drought stress on day 1; TL4d: lower drought stress on day 4; TL8d: lower drought stress on day 8; TH0d: greater drought stress on day 0; TH1d: greater drought stress on day 1; TH4d: greater drought stress on day 4; TH8d: greater drought stress on day 8.