Table 2.
Statistical Tests of Synonymous (Ks) and Nonsynonymous (Ka) Substitution Rates and Mutation Rates between Cen8 Genes and Chr3S Noncentromeric Genes
| Test | Gene | OS versus OG | OS versus OB | OG versus OB |
| Ks | Chr3S genes | 0.0287 (1515) | 0.3000 (268) | 0.3245 (238) |
| Cen8 genes | 0.0056 (13) | 0.2234 (7) | 0.2219 (7) | |
| Welch t test P value (one tail) | 7.716E-11*** | 0.00182** | 3.62E-5*** | |
| Ka | Chr3S genes | 0.0113 (1515) | 0.0436 (268) | 0.0505 (238) |
| Cen8 genes | 0.0043 (13) | 0.0385 (7) | 0.0347 (7) | |
| Welch t test P value (one tail) | 0.000828*** | 0.3000 | 0.0796 | |
| Mutation rate (/bp/MY) | Chr3S gene | 0.0066 (1515) | 0.00466 (268) | 0.00486 (238) |
| Cen8 genes | 0.00250 (13) | 0.00393 (7) | 0.00381 (7) | |
| Welch t test P value (one tail) | 1.3553E-5*** | 0.169 | 0.0594 |
OB, O. brachyantha; OG, O. glaberrima; OS, O. sativa. **, significant level as P < 0.01; ***, significant level as P < 0.001. The numbers in parentheses indicate the number of genes used for each test.