Table 1. Segmental duplications of trihelix paralogous pairs in soybean and inference of duplication time.
| Trihelix gene pairs | Ka | Ks | Ka/Ks | P-Value (Fisher) | Length (bp) | Approximate duplication date (MYA) |
|---|---|---|---|---|---|---|
| Glyma.01G121000 &Glyma.03G056900 | 0.0320 | 0.2021 | 0.1584 | 2.22E−11 | 792 | 16.57 |
| Glyma.04G194600 &Glyma.06G171400 | 0.0156 | 0.1079 | 0.1445 | 2.20E−20 | 2,640 | 8.84 |
| Glyma.04G216100 &Glyma.09G116400 | 0.0084 | 0.0204 | 0.4141 | 0.041626 | 1,467 | 1.67 |
| Glyma.08G257500 &Glyma.18G281800 | 0.0234 | 0.1620 | 0.1442 | 1.35E−12 | 972 | 13.28 |
| Glyma.09G116400 &Glyma.06G149900 | 0.0432 | 0.1596 | 0.2705 | 8.73E−11 | 1,431 | 13.08 |
| Glyma.10G065100 &Glyma.13G149900 | 0.0176 | 0.1279 | 0.1376 | 8.36E−15 | 1,437 | 10.48 |
| Glyma.10G202300 &Glyma.20G188100 | 0.0364 | 0.1109 | 0.3286 | 2.45E−07 | 1,593 | 9.09 |
| Glyma.10G298700 &Glyma.20G249900 | 0.0537 | 0.2249 | 0.2388 | 1.95E−11 | 945 | 18.43 |
| Glyma.11G247300 &Glyma.18G010000 | 0.0013 | 0.1009 | 0.0126 | 0 | 1,119 | 8.27 |
| Glyma.12G210900 &Glyma.13G290500 | 0.0252 | 0.2416 | 0.1042 | 1.21E−16 | 909 | 19.80 |
| Glyma.13G195800 &Glyma.15G234100 | 0.0600 | 0.2071 | 0.2898 | 9.48E−09 | 957 | 16.97 |
| Glyma.13G359800 &Glyma.15G014200 | 0.0355 | 0.1386 | 0.2565 | 1.71E−07 | 1,146 | 11.36 |
| Glyma.19G190000 &Glyma.03G189600 | 0.0274 | 0.1288 | 0.2126 | 7.40E−11 | 1,320 | 10.55 |
Notes.
Non-synonymous (Ka) and synonymous (Ks) show the substitution rates. Ka/Ks is the ratio of non-synonymous (Ka) versus synonymous (Ks) mutations. This ratio is used as indicator to determine the selective pressure or strength on a protein-encoding gene. Ka/Ks = 1 shows “no selection”, Ka/Ks<1 indicates “negative or purifying selection” and Ka/Ks>1 denotes “positive or Darwinian selection”.