Table 2.
Karyological data and population cytotypes for the studied Sorbus taxa (for more detailed information about specimen localities and FCM results, see Supplementary Data Table S1)
| Taxon | 2n* | Ploidy | DNA ploidy† | No. of specimens | No. of populations | Ratio‡ (mean ± s.d.) |
|---|---|---|---|---|---|---|
| S. admonitor M.Proctor | approx. 68 | 4x | 4x | 4 | 1 | 3·172 ± 0·038 |
| S. anglica Hedl. | 51, 68 | 3x, 4x | 4x | 16 | 10 | 2·960 ± 0·038 |
| S. aria (L.) Crantz | 34 | 2x | 2x | 82 | 25 | 1·490 ± 0·017 |
| S. cf. aria | – | – | 3x | 14 | 7 | 2·270 ± 0·028 |
| S. aucuparia L. | 34 | 2x | 2x | 13 | 10 | 1·522 ± 0·011 |
| S. bristoliensis Wilmott | 51 | 3x | 3x | 1 | 1 | 2·318 |
| S. cambrensis M.Proctor | 68 | 4x | 5x | 13 | 3 | 3·737 ± 0·050 |
| S. cheddarensis L.Houston & Ashley Robertson | – | 3x§ | 3x | 5 | 2 | 2·264 ± 0·018 |
| S. cf. cheddarensis | – | – | 3x | 15 | 4 | 2·265 ± 0·022 |
| S. cuneifolia T.C.G.Rich | – | – | 4x | 1 | 1 | 2·963 |
| S. devoniensis E.F.Warb. | 68 | 4x | 4x | 6 | 3 | 3·151 ± 0·033 |
| S. eminens E.F.Warb. | 68 | 4x | 4x | 32 | 8 | 3·029 ± 0·018 |
| S. cf. eminens | – | – | 4x | 3 | 2 | 3·028 ± 0·016 |
| S. eminentiformis T.C.G.Rich | 68 | 4x | 4x | 10 | 3 | 3·009 ± 0·027 |
| S. eminentoides L.Houston | – | 4x§ | 4x | 5 | 1 | 3·002 ± 0·030 |
| S. cf. eminentoides | – | – | 4x | 5 | 1 | 3·017 ± 0·020 |
| S. hybrida L. | 68 | 4x | 4x | 2 | 1 | 2·946 ± 0·053 |
| S. intermedia (Ehrh.) Pers. | 68 | 4x | 4x | 4 | 3 | 3·018 ± 0·054 |
| S. lancastriensis E.F.Warb. | 68 | 4x | 4x | 10 | 4 | 3·000 ± 0·029 |
| S. latifolia (Lam.) Pers. | 34, 68 | 2x, 4x | 4x | 1 | 1 | 3·143 |
| S. leighensis T.C.G.Rich | – | 3x§ | 3x | 2 | 2 | 2·296 ± 0·000 |
| S. leptophylla E.F.Warb. | 68 | 4x | 4x | 5 | 1 | 3·007 ± 0·049 |
| S. leyana Wilmott | 51 | 3x | 3x | 4 | 1 | 2·265 ± 0·013 |
| S. margaretae M.Proctor | 68 | 4x | 4x | 6 | 4 | 3·014 ± 0·036 |
| S. minima (Ley) Hedl. | 51 | 3x | 3x | 4 | 1 | 2·275 ± 0·015 |
| S. mougeotii Soy.-Will. & Godr. | 68 | 4x | 4x | 5 | 3 | 3·018 ± 0·046 |
| S. ‘Observatory Hill taxon’ | – | – | 3x | 12 | 1 | 2·255 ± 0·018 |
| S. parviloba T.C.G.Rich | – | – | 4x | 1 | 1 | 3·011 |
| S. cf. parviloba | – | – | 3x | 2 | 1 | 2·248 ± 0·004 |
| S. porrigentiformis E.F.Warb. (s.s.) | 68 | 4x | 4x | 23 | 9 | 3·018 ± 0·030 |
| S. porrigentiformis (agg.) | – | – | 4x | 5 | 7 | 3·011 ± 0·015 |
| S. porrigentiformis ‘Symonds Yat clone’ | – | – | 3x | 11 | 3 | 2·269 ± 0·017 |
| S. cf. porrigentiformis | – | – | 5x | 1 | 1 | 3·807 |
| S. ‘Portishead taxon’ | – | – | 4x | 19 | 4 | 3·016 ± 0·029 |
| S. rupicola (Syme) Hedl. | 68 | 4x | 4x | 10 | 4 | 3·068 ± 0·024 |
| S. rupicoloides L.Houston | – | – | 4x | 3 | 1 | 3·013 ± 0·013 |
| S. saxicola T.C.G.Rich | – | – | 3x | 3 | 1 | 2·247 ± 0·004 |
| S. stenophylla M.Proctor | – | – | 5x | 5 | 2 | 3·696 ± 0·027 |
| S. subcuneata Wilmott | 51, approx. 68 | 3x, 4x | 3x | 12 | 7 | 2·346 ± 0·028 |
| S. torminalis (L.) Crantz | 34 | 2x | 2x | 14 | 7 | 1·612 ± 0·011 |
| S. vexans E.F.Warb. | 68 | 4x | 4x | 5 | 3 | 3·024 ± 0·030 |
| S. wilmottiana E.F.Warb. | 51 | 3x | 3x | 1 | 1 | 2·278 |
| S. cf. wilmottiana | – | – | 3x | 1 | 1 | 2·275 |
* Chromosome numbers extracted from Rich et al. (2010) and the Index to Plant Chromosome Numbers (IPCN electronic database; http://www.tropicos.org/Project/IPCN).
† Ploidy inferred by FCM.
‡ Fluorescence intensity ratio (target sample peak/internal standard peak) = relative DNA content.
§ Ploidy inferred from molecular data (Houston et al., 2009; Rich et al., 2010; Robertson et al., 2010).