Table 5.
Lignin Biosynthesis Pathway
| Enzymatic Activity | Reaction EC | Gene Name | Citrus Unigenesa | Phyl. Anal.b | ESTs |
| 4-coumarate coenzyme A ligase | 6.2.1.12 | At1g51680 | 1 | 1 | 4 |
| At1g62940 | 1 | 1 | 5 | ||
| At1g65060 | 1 (1) | 1 | 7 | ||
| At3g21240 | 1 (1) | 1 | 9 | ||
| At4g05160 | 1 | 1 | 1 | ||
| At5g63380 | 3 (1) | 3 | 13 | ||
| At1g20510 | 1 | 1 | 5 | ||
| Total | 7 | 9 | |||
| 5-hydroxy coniferaldehyde o-methyltransferase | 2.1.1.68 | At5g54160 | 5 (1) | 5 | 41 |
| caffeoyl-CoA O-methyltransferase | 2.1.1.104 | At4g34050 | 3 | 2 | 14 |
| cinnamoyl-CoA reductase | 1.2.1.44 | At1g80820 | 1 | 1 | 2 |
| At2g23910 | 1 | 1 | 10 | ||
| At4g30470 | 1 | 1 | 7 | ||
| At5g14700 | 1 | 1 | 10 | ||
| Total | 4 | 4 | |||
| cinnamyl-alcohol dehydrogenase | 1.1.1.195 | At1g09490 | 1 | 1 | 1 |
| At1g51410 | 1 | 1 | 2 | ||
| At4g27250 | 1 | 1 | 1 | ||
| At5g19440 | 2 (1) | 2 | 1 | ||
| At3g19450 | 1 | 1 | 6 | ||
| At4g34230 | 1 | 1 | 1 | ||
| Total | 6 | 7 | |||
| coniferyl aldehyde 5-hydroxylase | NIL | At4g36220 | 3 (2) | 3 | 15 |
| coumarate 3-hydroxylase | 1.14.13.36 | At2g40890 | 2 | 2 | 25 |
| feruloyl coenzyme A reductase | 1.2.1.44 | At1g15950 | 2 | 2 | 32 |
| UDP-glucose 4-epimerase | 1.2.1.44 | At2g02400 | 2 | 2 | 17 |
| At2g33590 | 1 | 1 | 13 | ||
| At5g58490 | 1 | 1 | 62 | ||
| Total | 3 | 4 | |||
a Number Citrus unigenes annotated assigned to the enzymatic activty
b Nimber of Unigenes that clustered with the Arabidpopsis proteins asociated with the enzymatic activity, in the phlyogenetic analysis.