Table 1 Effect of exogenous Put, SA, and AsA pretreatment on Y (II), Fm, Fv, Fv/Fm, F0, Fv/F0 in ‘Giziluzum’ under frost stress

-3

Control

0

0.5210 ± 0.004ab

2.514 ± 0.112bc

0.9723 ± 0.125 g

0.3853 ± 0.033e

1.377 ± 0.091a

0.7130 ± 0.124 g

Putrescine (mM)

1

0.5217 ± 0.002ab

2.095 ± 0.170de

1.009 ± 0.089 g

0.4870 ± 0.071c-e

1.286 ± 0.071ab

0.7850 ± 0.064 fg

5

0.5347 ± 0.005a

2.167 ± 0.159d

1.302 ± 0.154ef

0.60530.088 ± bc

1.197 ± 0.072b-d

1.099 ± 0.201de

Salicylic acid (mM)

0.1

0.5363 ± 0.005a

1.995 ± 0.322de

1.215 ± 0.104 fg

0.6183 ± 0.063bc

1.218 ± 0.027bc

0.9967 ± 0.070ef

0.5

0.5380 ± 0.012a

1.991 ± 0.196de

1.027 ± 0.121 g

0.5170 ± 0.048c-e

1.215 ± 0.020bc

0.8473 ± 0.115 fg

Ascorbic acid (mgL⁻¹)

200

0.5357 ± 0.004a

1.761 ± 0.107e

1.345 ± 0.038ef

0.7653 ± 0.026 a

1.090 ± 0.029e

1.234 ± 0.021c-e

22

Control

0

0.4583 ± 0.016c

3.532 ± 0.124a

1.826 ± 0.099ab

0.5167 ± 0.010c-e

1.213 ± 0.054bc

1.511 ± 0.145b

Putrescine (mM)

1

0.4627 ± 0.015c

2.586 ± 0.137bc

1.991 ± 0.143a

0.7737 ± 0.085a

1.126 ± 0.011c-e

1.769 ± 0.142a

5

0.4727 ± 0.009c

3.269 ± 0.124a

1.760 ± 0.144a-c

0.5393 ± 0.051 cd

1.178 ± 0.015c-e

1.494 ± 0.123b

Salicylic acid (mM)

0.1

0.5123 ± 0.008b

2.755 ± 0.080b

1.542 ± 0.072c-e

0.5600 ± 0.025c

1.182 ± 0.047c-e

1.306 ± 0.068b-d

0.5

0.5253 ± 0.003ab

2.247 ± 0.123 cd

1.601 ± 0.075b-d

0.7163 ± 0.073ab

1.096 ± 0.025de

1.463 ± 0.101bc

Ascorbic acid (mgL⁻¹)

200

0.5373 ± 0.003a

3.459 ± 0.112a

1.435 ± 0.069d-f

0.4150 ± 0.017de

1.120 ± 0.018c-e

1.282 ± 0.065b-d

Means of squares

df

Temperature

**

**

**

ns

**

**

Treatments

**

**

ns

**

**

ns

Temperature×Treatments

**

**

**

**

*

**

Error

0.000

0.038

0.0018

0.0018

0.003

0.019

CV

2.05

7.70

9.34

11.56

4.88

11.47