Table 1.
Summary of Allopolyploid Lineages Used in This Study.
| Allopolyploid Species Complex | Time Since Polyploidization (Ma) | Subgenome Divergence (dS)a | Genome Type | Maternal Diploid (Genome Type) | Paternal Diploid (Genome Type) | Outgroup Species |
|---|---|---|---|---|---|---|
| Brachypodium hybridum | 0.10–0.15 | 0.103 | SSTT | B. stacei (SS) | B. distachyon (DD) | Hordeum vulgare (barley) |
| Chenopodium quinoa (quinoa) | 4–6 | 0.105 | AABB | Ch. pallidicaule (AA) | Ch. suecicum (BB) | Spinacea oleracea (spinach) |
| Coffea arabica (coffee) | 0.01–0.05 | 0.026 | EECC | Co. eugenioides (EE) | Co. canephora (CC) | Gardenia jasminoides |
| Gossypium hirsutum (cotton) | 1–2 | 0.041 | AADD | G. arboreum (AA) | G. raimondii (DD) | Gossypioides kirkii |
| Nicotiana tabacum (tobacco) | 0.1–0.20 | 0.096 | SSTT | N. sylvestris (SS) | N. tomentosiformis (SS) | Solanum lycopersicum (tomato) |
| Triticum dicoccoides (wheat) | 0.5–1 | 0.076 | BBAA | A. speltoides (SS) | T. urartu (AA) | H. vulgare (barley) |
a
Synonymous substitutions per synonymous site inferred from the concatenated estimates of dS from the non-organelle-targeted genes, see fig. 1.