Fig. 1

Physiological experiments of 8X Alamo and 4X Alamo switchgrasses. a–f physiology indicators under 0, 6th, 12th and 18th days of drought, orange columns refer to 4X Alamo, blue columns refer to 8X Alamo, hollow columns refer to control group, slashed columns refer to drought stress group. a Chlorophyll content. b Peroxidase activity. c Superoxide activity. d Malondialdehyde content. e Relative electrical conductivity. f Relative water content. Lower case letters a, b, c above the columns indicating the significance (P < 0.05) among different plant at same time point