Figure 5.

Changes in ABA (a) and IAA contents (b) before (T0) and after a heat stress treatment (37 or 50 °C for 3 h), in needles of in vitro growing maritime pine plants. Plants were generated by SE from not primed (NP plants, grey bars), or primed at 37 °C (P37, orange bars) or at 50 °C (P50, red bars) megagametophytes. Data are mean ± SE of 4 replicates. For each group of plants, values followed by the same letter were not significantly different according to Tukey (a) or Kruskal-Wallis (b) tests.