Additional file 2 of Morphological, physiological, and transcriptional responses to low nitrogen stress in Populus deltoides Marsh. clones with contrasting nitrogen use efficiency

Additional file 2: Table S1. Low nitrogen adaptation coefficients of the traits of N-efficient and N-inefficient genotypes. Table S2. Differences in enzyme activities, total amino acid contents, and soluble sugar contents in leaves during N treatment of N-efficient (A) and N-inefficient (C) genotypes. Table S3. Results of quality analysis of the RNA sequencing data. Table S4. Genes in the ‘magenta’ module. Table S5. Annotation description of the top 10 genes for connectivity (hub genes) in the ‘magenta’ module. Table S6. Annotation of transcription factors in the ‘magenta’ module. Table S7. The reaction system of quantitative real-time reverse transcription PCR (qRT-PCR). Table S8. Primers used for quantitative real-time reverse transcription PCR (qRT-PCR) analysis.