Fig. 2.

Influence of species-ploidy group on leaf elongation at 10 °C/5 °C. Leaves were measured during 14 d every other day for plants growing at 10 °C/5 °C day/night temperature and a 12h day/12h night cycle under 1000 μmol photons m–2 s–1. Species-ploidy groups are ordered from highest to lowest leaf elongation at 10 °C/5 °C. Asterisks indicate significantly lower leaf elongation in comparison with M. ×giganteus (3x) ‘Illinois’ (2.53mm d–1) based on Dunnett’s test († P≤0.1; *P≤0.05; **P≤0.01). Data are the mean +SE (n varied from 3 to 81 depending on group). Msa, M. sacchariflorus; Msi, M. sinensis; Mxg, M. ×giganteus.