Figure 6.

Expression level of WKY (a), HSP (b), SOD (c) and APX (d) genes in needles of 2-year-old maritime pine plants derived by somatic embryogenesis from not primed (NP) or primed at 37 °C (P37) or at 50 °C (P50) megagametophytes, when subjected to a 12-d heat stress treatment, and allowed to recovery for further 14 d. HIS was used as reference gene. Data are mean ± SE of 3 replicates. For each type of sample, values followed by the same letter were not significantly different according to Tukey test.