Table 2 Shoot length, Leaf mass per area (LMA), dry biomass of leaf (DM_leaves), stem (DM_stem) and roots (DM_root) measured for 5C and Riesling x 5C (RR) plants 8 weeks after the beginning of treatments (n = 7–10). W = well-watered plants; D = drought-stressed; C = control, non-phylloxerated; P = root phylloxerated. * indicates statistically significant differences within the factors (Irrigation or Infestation). A significant interaction between factors (Irr x Inf) was observed in Shoot length (within C level: W > D; within P level: W > D) and DM_roots (within D level: C > P) measured in RR

W

D

C

P

Irr x Inf

W

D

C

P

Irr x Inf

Shoot length, m

5.3 ± 0.2

2.0 ± 0.2*

3.8 ± 0.2

3.5 ± 0.2

n.s.

3.5 ± 0.1

1.4 ± 0.1*

2.4 ± 0.1

2.5 ± 0.1

*

LMA, g cm⁻²

5.7 ± 0.1

5.6 ± 0.1

5.6 ± 0.1

5.7 ± 0.1

n.s.

5.8 ± 0.1

5.9 ± 0.2

6.1 ± 0.1

5.6 ± 0.2*

n.s.

DM_leaves, g

31.0 ± 1.6

13.9 ± 1.5*

23.0 ± 1.7

21.9 ± 1.4

n.s.

23.7 ± 0.9

11.4 ± 0.9*

17.6 ± 1.0

17.4 ± 0.9

n.s.

DM_stem, g

26.8 ± 1.3

9.1 ± 1.2*

18.7 ± 1.3

17.2 ± 1.2

n.s.

22.5 ± 1.0

9.0 ± 0.9*

15.7 ± 1.0

15.8 ± 0.9

n.s.

DM_roots, g

21.2 ± 1.3

23.8 ± 1.2

22.0 ± 1.3

23.1 ± 1.2

n.s.

22.2 ± 1.0

21.9 ± 1.0

22.6 ± 1.0

21.5 ± 1.0

*