Table 6 The effect of different qualities of light and three methods of replacement of nutrient solution on DPPH radical scavenging activity and enzymes activity of two varieties of lettuce in floating hydroponics.

From: Manipulation of light spectrum is an effective tool to regulate biochemical traits and gene expression in lettuce under different replacement methods of nutrient solution

Source of variation

Df

DPPH radical scavenging activity

Guaiacol peroxidase enzyme activity

Catalase enzyme activity

Superoxide dismutase enzyme activity

Variety (V)

1

0.0001ns

2234**

8.69*

534**

Light (L)

3

176**

24,004**

275**

10,162**

Nutrient solution (N)

2

26.5**

2361**

27.09**

118ns

V*L

3

194**

6937**

63.9**

1990**

V*N

2

142**

20,389**

154**

7233**

L*N

6

183**

18,891**

255**

11,573**

V*L*N

6

82.2**

9500**

135**

2339**

Experimental Error

48

1.91

80.2

1.46

52.8

Coefficient Variance (%)

–

3.28

3.28

4.0

3.06

  1. ns, * and ** indicate non-significance, significant at 5% and 1% probability level (Duncan’s Test), respectively.
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