Fig. 2.

Heatmaps of DEGs in the roots, stems and leaves of Populus simonii× P.nigra.a The heatmap of DEGs in the three tissues of Populus simonii× P.nigra; b The heatmap of DEGs in the three tissues of Populus simonii× P.nigra with salt treatment. Red and green colors indicate up- and down-regulated expression, respectively. The colorful vertical bars denote different gene clusters. R, S, L indicate the roots, stems and leaves under control condition, respectively; S-R, S-S, S-L indicate the roots, stems and leaves under salt stress condition, respectively