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Photosynthetic activity, determined as photosystem II yield, 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. Data are mean ± SE of 3 replicates. For each group of plants, values followed by the same letter were not significantly different according to Tukey test.
