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Relative expression of the 17 P. trichocarpa ABC1 genes. The five treatments investigated were ABA, PEG, Cd, NaCl, and HT (high temperature). I, II, and III represent the three groups shown in the phylogenetic tree in Figure 2. 0 h represents no treatment. 0.5, 1, 4, and 8 h represent the corresponding times under different treatments.
