Figure 1.

Variation in Relative Water Content (a) and in proline content (b) in needles of 3-year-old maritime pine plants generated by somatic embryogenesis from not-primed (NP) or primed at 37 °C (P37) or at 50 °C (P50) megagametophytes, when subjected to a 30-day hydric stress treatment and allowed to recover for further 10 days. Data are mean ± SE of differences referred to the mean initial content determined in needles sampled during (T15), at the end of the treatment (T30), and after the recovery period (TR), in 6 replicates each. At each sampling time, values following the same letter were not significantly different according to Tukey-b test (α = 0.05).