Table 2. Identification of lignin biosynthesis genes.
| Enzymes | Numbers of genes | ||||
| Paper mulberry | Poplar* | Arabidopsis* | Medicago* | Rice* | |
| C3H | 1 | 4 | 3 | 1 | 1 |
| F5H | 1 | 4 | 2 | 3 | 3 |
| C4H | 4 | 3 | 1 | 1 | 4 |
| 4CL | 26 | 22 | 13 | 10 | 16 |
| CAD | 6 | 21 | 9 | 21 | 5 |
| HCT | 12 | 7 | 1 | 6 | 9 |
| CCOAMT | 3 | 7 | 7 | 4 | 11 |
| CCR | 14 | 40 | 7 | 18 | 55 |
| PAL | 12 | 6 | 4 | 4 | 14 |
| COMT | 24 | 35 | 16 | 26 | 38 |
Abbriviations: CAD: Cinnamyl alcohol dehydrogenase, PAL: L-Phenylalanine ammonia-lyase, CCOAMT: Cinnamoyl CoA O-methyltransferase, COMT: Caffeic acid O-methyltransferase, 4CL: 4-Coumarate coenzyme A (CoA) ligase, CCR: Cinnamoyl-CoA reductases, C4H: Cinnamate-4-hydroxylase, HCT: Hydroxycinnamoyl transferase, C3H: 4-Coumarate 3-hydroxylase, F5H: Ferulate 5-hydroxylase.
*Those data were referenced from Xu et al., 2009.