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Table 1 Four-hour electrical penetration graph (EPG) analyses of the green peach aphid Myzus persicae feeding from wild-type (WT) Arabidopsis plants

From: Harpin-induced expression and transgenic overexpression of the phloem protein gene AtPP2-A1 in Arabidopsis repress phloem feeding of the green peach aphid Myzus persicae

Activity examined

Control group mean (SD*)

HrpNEatreatment group mean (SD*)

Student's t-test (n = 20)

Number of nonpuncturing phase

total

13.5 (2.2)

16.0 (3.5)

**

 

1st h

6.0 (1.0)

13 (2.5)

p < 0.01

 

2nd h

0

0

 
 

3rd h

6.5 (0.8)

2 (0.5)

p < 0.01

 

4th h

1.0 (0.3)

1.0 (0.3)

**

Duration of nonpuncturing, min

total

19.8 (5.2)

16.8 (4.6)

**

 

1st h

4.9 (0.3)

15.0 (3.9)

p < 0.01

 

2nd h

0

0

 
 

3rd h

11.1 (3.6)

1.3 (0.4)

p < 0.01

 

4th h

3.8 (1.2)

0.5 (0.2)

p < 0.01

Time to 1st cell puncturing, min

 

2.1 (0.6)

2.1 (0.3)

**

Time to 1st pathway, min

 

3.3 (0.5)

3.0 (0.4)

**

Number of pathway phase

total

19.5 (2.0)

16.5 (1.5)

**

 

1st h

5.2 (0.5)

11.5 (1.0)

p < 0.01

 

2nd h

3.0 (0.3)

2.0 (0.1)

**

 

3rd h

7.3 (1.0)

2.0 (0)

p < 0.01

 

4th h

4.0 (0.5)

2.0 (0.2)

p < 0.01

Duration of pathway phase, min

total

175.7 (48.9)

205.0 (62.5)

p < 0.01

 

1st h

55.1 (6.7)

45.0 (7.5)

p < 0.01

 

2nd h

37.2 (3.5)

43.9 (7.2)

p < 0.05

 

3rd h

47.4 (5.6)

56.6 (8.0)

p < 0.01

 

4th h

36/0 (3.2)

59.5 (10.5)

p < 0.01

Time to 1st phloem phase, min

 

85.6 (10.7)

104.3 (12.0)

p < 0.01

Number of cell puncturing after 1st phloem phase

 

20.5 (2.0)

11 (1.6)

p < 0.01

Number of phloem phase

total

7 (1.0)

3.0 (0.2)

p < 0.01

 

1st h

0

0

 
 

2nd h

3.0 (0.5)

1.5 (0.5)

p < 0.01

 

3rd h

1.0 (0)

1.5 (0.5)

**

 

4th h

3.0 (0.5)

0

p < 0.01

Duration of phloem phase, min

total

44.5 (8.5)

18.2 (3.6)

p < 0.01

 

1st h

0

0

 
 

2nd h

22.8 (5.0)

16.1 (3.5)

p < 0.01

 

3rd h

1.5 (0.5)

2.1 (0.6)

p < 0.01

 

4th h

20.2 (3.5)

0

p < 0.01

Duration of phloem feeding, min

total

44.5 (8.5)

18.2 (3.6)

p < 0.01

 

E1

12.6 (2.8)

5.0 (1.4)

p < 0.01

 

E2

31.9 (3.5)

13.2 (3.1)

p < 0.01

  1. *SD, standard deviation. **Insignificant difference at p < 0.05.