Table 2 Effect of drought stress on the photosynthetic parameters of ‘Jizhen-2’ and ‘ZC9-3’

Pn (µmol·m^− 2·s^− 1)

10.82 ± 0.21 a

2.31 ± 0.20 c

-78.62

11.42 ± 0.61 a

4.73 ± 0.18 b

-58.61

Tr (mmol·m^− 2·s^− 1)

5.76 ± 0.11 a

0.62 ± 0.01 c

-89.21

5.86 ± 0.03 a

1.01 ± 0.07 b

-82.79

Ci (µmol·mol^− 1)

325.54 ± 4.15 a

247.39 ± 5.53 c

-24.00

321.03 ± 1.78 a

260.46 ± 2.95 b

-18.87

Gs (mol·m^− 2·s^− 1)

0.288 ± 0.010 a

0.016 ± 0.001 b

-94.44

0.295 ± 0.008 a

0.024 ± 0.001 b

-91.93

WUE_I (µmol·mmol^− 1)

1.88 ± 0.07 c

3.73 ± 0.32 b

98.08

1.95 ± 0.10 c

4.38 ± 0.17 a

124.60