Root zone temp.

Leaf number

Shoot length (cm)

Total root length (cm)

Tap root diameter (mm)

20˚C

7.6 ± 0.2 a

34.5 ± 1.1 a

61.7 ± 6.3 a

16.8 ± 1.5 a

25˚C

7.8 ± 0.2 a

32.1 ± 1.1 ab

65.2 ± 3.4 a

14.2 ± 1.3 ab

29˚C

7.6 ± 0.2 a

34.7 ± 0.9 a

67.4 ± 4.2 a

11.6 ± 0.7 bc

33˚C

6.4 ± 0.2 b

29.2 ± 0.6 b

42.1 ± 2.3 b

7.8 ± 0.6 c