Table 5.
DNA 2C values for the species and hybrids of Diphasiastrum studied
| Taxon and genome formula | Genome formula | Values measured (pg ± s.d.) | Values predicted (pg) | Difference measured – predicted (pg) |
|---|---|---|---|---|
| Species | ||||
| D. alpinum | AA | 7·52 ± 0·06 | ||
| D. complanatum | CC | 5·76 ± 0·05 | ||
| D. tristachyum | TT | 5·26 ± 0·06 | ||
| Diploid hybrids | ||||
| D. × issleri | AC | 6·64 ± 0·07 | 6·64 | 0·00 |
| D. × oellgaardii | AT | 6·39 ± 0·08 | 6·39 | 0·00 |
| D. × zeilleri | CT | 5·53 ± 0·05 | 5·51 | 0·02 |
| Triploid hybrids | ||||
| D. alpinum × D. × issleri | AAC | 10·30 ± 0·06 | 10·40 | –0·10 |
| D. alpinum × D. × oellgaardii | AAT | 9·97 ± 0·07 | 10·15 | –0·18 |
| D. complanatum × D. × issleri | ACC | 9·48 ± 0·12 | 9·52 | –0·04 |
For the hybrids, a comparison is made between the values measured and those predicted on the basis of the parental genome sizes; the calculation for the triploids was made in accordance with the assumed origin (e.g. by summing the size of an unreduced genome of a hybrid and one half of the parental species' genome; see text); the assumed hybrid origin is indicated by genome formulae.