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Table 1 Effect of SL on the photosynthetic parameters of P. purpureum leaves under drought stress

From: Effects of exogenous Strigolactone on the physiological and ecological characteristics of Pennisetum purpureum Schum. Seedlings under drought stress

Treatment

Net photosynthetic rate

Stomatal conductance

Transpiration rate

Intercellular CO2 concentration

Water use efficiency

μmol·(m2·s)−1

μmol·(m2·s)− 1

mmol·(m2·s)− 1

μmol∙mol− 1

mmol·mol− 1

24 h

N

19.94 ± 0.24a

174.20 ± 1.80a

4.46 ± 0.02a

154.00 ± 2.28b

4.47 ± 0.03a

D

12.14 ± 0.51c

98.00 ± 2.55b

3.23 ± 0.07c

148.80 ± 8.48b

3.76 ± 0.16b

T1

16.54 ± 0.90b

178.60 ± 8.27a

3.81 ± 0.11b

189.60 ± 10.12a

4.35 ± 0.21a

T2

17.06 ± 1.73ab

184.20 ± 23.50a

4.43 ± 0.34a

184.60 ± 3.94a

3.81 ± 0.11b

T3

15.94 ± 1.01b

172.80 ± 11.68a

4.54 ± 0.15a

189.60 ± 2.73a

3.50 ± 0.15bc

T4

12.42 ± 1.08c

123.80 ± 10.88b

4.00 ± 0.17ab

183.20 ± 5.68a

3.08 ± 0.15c

48 h

N

18.80 ± 0.33a

137.40 ± 4.20b

4.21 ± 0.06a

133.20 ± 6.35c

4.47 ± 0.14a

D

11.14 ± 0.56bc

103.40 ± 6.71c

2.66 ± 0.09cd

185.20 ± 15.86b

4.21 ± 0.25ab

T1

12.48 ± 1.00b

165.60 ± 16.34a

3.91 ± 0.20ab

225.80 ± 8.65a

3.19 ± 0.19c

T2

12.84 ± 0.82b

133.60 ± 9.50b

3.56 ± 0.17b

194.00 ± 7.12b

3.61 ± 0.18bc

T3

11.94 ± 0.30b

112.00 ± 4.44bc

2.85 ± 0.07c

181.40 ± 5.07b

4.19 ± 0.11ab

T4

9.38 ± 0.97c

94.00 ± 6.56c

2.38 ± 0.12d

201.20 ± 10.20ab

3.90 ± 0.26ab

120 h

N

19.56 ± 0.54a

168.60 ± 16.50a

5.04 ± 0.31a

138.60 ± 7.26b

4.24 ± 0.20bc

D

7.66 ± 1.15d

59.20 ± 8.11d

1.78 ± 0.19c

163.60 ± 8.43a

3.91 ± 0.16c

T1

14.98 ± 0.50b

128.20 ± 5.28b

3.16 ± 0.15b

159.20 ± 1.53a

4.76 ± 0.14ab

T2

13.16 ± 0.75b

99.00 ± 8.45c

2.76 ± 0.10b

137.40 ± 6.55b

4.75 ± 0.16ab

T3

10.42 ± 0.93c

76.00 ± 8.23cd

2.11 ± 0.18c

138.60 ± 11.05b

4.96 ± 0.25a

T4

7.50 ± 1.02d

53.00 ± 5.84d

1.65 ± 0.15c

148.20 ± 11.36ab

4.46 ± 0.26abc

  1. Different lowercase letters in the same column indicate significant differences (P < 0.05). N: normal watering treatment; D: drought stress treatment only; T1, T2, T3, and T4 represent the different treatment concentrations of SL under drought stress (1, 3, 5, and 7 μmol·L− 1, respectively)