Table 2.
Expression (RT-PCR) of Arabidopsis PG genes in different clades
| Set* | Gene1 | Gene2 | Ks† | t‡ | p < 0.05‡ |
| B1 | At1g02460 | At4g01890 | 1.0564 | 3.09 | n |
| B2 | At1g10640 | At1g60590 | 1.252 | -0.32 | n |
| B3 | At1g23460 | At1g70500 | 0.8011 | -0.73 | n |
| B3 | At1g23470 | At1g70500 | 1.877 | -14.70 | y |
| B4 | At2g41850 | At3g57510 | 0.6805 | -1.43 | n |
| B5 | At2g43860 | At3g59850 | 2.1371 | -3.00 | n |
| B5 | At2g43870 | At3g59850 | 0.9534 | 2.13 | n |
| B5 | At2g43880 | At3g59850 | 1.8279 | 1.00 | n |
| B5 | At2g43890 | At3g59850 | 1.8308 | -1.41 | n |
| T1 | At1g05650 | At1g05660 | 0.2385 | ND§ | y |
| T2 | At1g23460 | At1g23470 | 0.878 | 6.53 | y |
| T3 | At2g43860 | At2g43870 | 1.4013 | -6.53 | y |
| T4 | At2g43880 | At2g43890 | 4.2072 | 2.83 | n |
| T5 | At3g07820 | At3g07830 | 0.5342 | ND§ | y |
| T5 | At3g07820 | At3g07840 | 0.4923 | ND§ | y |
| T5 | At3g07830 | At3g07840 | 0.457 | ND | ND |
| T6 | At4g32370 | At4g32380 | 2.6336 | 0.73 | n |
| T7 | At5g44830 | At5g44840 | 0.1626 | ND | ND |
*Each set contains genes that were duplicated through either local-scale block duplication (B) or tandem duplication (T). In duplicated blocks where a PG is collinear with a cluster, the one-to-many relationships are shown. For tandem clusters, all pairwise combinations are shown. †Ks, synonymous substitution rate. ‡Differences in expression patterns significant (y) or not (n) for t-test with df = 2, p < 0.05 [52]. ND, not determined since both genes do not have detectable RT-PCR product or §expression was documented for only one gene in the pair.