Figure 2.

Functional distribution of genes differentially expressed in soybean roots and nodules by the 5-mM nitrate treatment. (A) Upregulated genes > fourfold in the roots and nodules of soybean plants after 24 h of the 5 mM of the nitrate treatment compared with control. (B) Downergulated genes > fourfold in the roots and nodules of soybean plants after 24 h of the 5 mM of the nitrate treatment compared with control. Functional categories: (1) Information storage and processing, J: translation, ribosomal structure and biogenesis, K: transcription, L: DNA replication, recombination, and repair. (2) Cellular processes, D: cell division and chromosome partitioning, M: cell envelope biogenesis, outer membrane, N: cell motility and secretion, O: post-translational modification, protein turnover, chaperones, P: inorganic ion transport and metabolism, T: signal transduction mechanisms. (3) Metabolism, C: energy production and conversion, E: amino acid transport and metabolism, F: nucleotide transport and metabolism, G: carbohydrate transport and metabolism, H: coenzyme transport and metabolism, I: lipid metabolism. (4) Poorly characterized proteins, R: general function prediction only.