Figure 3.

Abscisic acid (a) and indole-acetic acid (b) contents in needles of maritime pine plants derived from somatic embryos matured at different temperatures (18, 23, or 28 °C) that were employed in a heat stress experiment for 45 °C for 3 h/day, for 10 days. Plants were sampled at the beginning of the stress treatment (t0), at the end of the stress treatment (t10), and after a recovery period of a further 10 days (tR). Data are the mean ± SD of four replicates. Within each group of plants, values followed by the same lowercase letter did not differ significantly according to the Tukey-b test, while capital letters indicate mean separation among groups of plants sampled at the same time.