Table 2.
Statistics summary of R genes in the 13 studied species.
| Index | Species | #R candidate | #NBS R | NBS R/Gene | #R TD* | #TD R** | TD R/NBS | #R singleton | #R locus |
|---|---|---|---|---|---|---|---|---|---|
| 1 | S. italica | 1,264 | 535 | 1.55% | 106 | 303 | 0.57 | 232 | 338 |
| 2 | S. viridis | 1,152 | 465 | 1.32% | 92 | 241 | 0.52 | 224 | 316 |
| 3 | P. virgatum+ | 2,949 | 1,267 | 1.38% | 212 | 524 | 0.41 | 743 | 955 |
| 4 | P. hallii | 1,101 | 420 | 1.13% | 86 | 234 | 0.56 | 186 | 272 |
| 5 | S. bicolor | 1,036 | 425 | 1.24% | 82 | 233 | 0.55 | 192 | 274 |
| 6 | Z. mays+ | 1,101 | 306 | 0.34% | 36 | 79 | 0.26 | 227 | 263 |
| 7 | O. thomaeum | 410 | 97 | 0.34% | 4 | 8 | 0.08 | 89 | 93 |
| 8 | T. aestivum++ | 5,712 | 2,747 | 2.55% | 547 | 1,588 | 0.58 | 1,159 | 1,706 |
| 9 | B. stacei | 945 | 377 | 1.26% | 78 | 203 | 0.54 | 174 | 252 |
| 10 | B. distachyon | 1,091 | 464 | 1.35% | 105 | 267 | 0.58 | 197 | 302 |
| 11 | O. sativa | 1,390 | 587 | 1.40% | 116 | 339 | 0.58 | 248 | 364 |
| 12 | M. acuminate | 863 | 190 | 0.52% | 24 | 67 | 0.35 | 123 | 147 |
| 13 | A. thaliana | 896 | 229 | 0.83% | 49 | 124 | 0.54 | 105 | 154 |
*R TD means tandem duplication array that is composed of R genes;
**TD R means the R genes comes from a tandem array; +: tetrapolyploidization; ++: hexapolyploidization.