Fig. 6.

Growth curves for the cotyledon and epicotyl–plumule inside radicle-emerged seeds of Viburnum betulifolium incubated at 20/10 or 5 °C for 20–24 weeks (A) and of V. parvifolium seeds incubated at 20/10 or 5 °C for 14–16 weeks (B). The radicle-emerged seeds of V. betulifolium and V. parvifolium were at 5 °C for 12 weeks and then were moved (arrow) to 20/10 °C for another 11 and 2 weeks, respectively. Means (n = 13–20) for each curve with the same letter do not differ significantly (l.s.d., P = 0·05). Seeds of V. betulifolium and V. parvifolium were collected in 2007. Vertical bars are ±1 s.e.