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| Content Provider | Springer Nature Link |
|---|---|
| Author | Aoki, Seishiro Uehara, Koichi Imafuku, Masao Hasebe, Mitsuyasu Ito, Motomi |
| Copyright Year | 2004 |
| Abstract | The B-class MADS-box genes composed of APETALA3 (AP3) and PISTILLATA (PI) lineages play an important role in petal and stamen identity in previously studied flowering plants. We investigated the diversification of the AP3-like and PI-like MADS-box genes of eight species in five basal angiosperm families: Amborella trichopoda (Amborellaceae); Brasenia schreberi and Cabomba caroliniana (Cabombaceae); Euryale ferox, Nuphar japonicum, and Nymphaea tetragona (Nymphaeaceae); Illicium anisatum (Illiciaceae); and Kadsura japonica (Schisandraceae). Sequence analysis showed that a four amino acid deletion in the K domain, which was found in all previously reported angiosperm PI genes, exists in a PI homologue of Schisandraceae, but not in six PI homologues of the Amborellaceae, Cabombaceae, and Nymphaeaceae, suggesting that the Amborellaceae, Cabombaceae, and Nymphaeaceae are basalmost lineages in angiosperms. The results of molecular phylogenetic analyses were not inconsistent with this hypothesis. The AP3 and PI homologues from Amborella share a sequence of five amino acids in the 5′ region of exon 7. Using the linearized tree and likelihood methods, the divergence time between the AP3 and PI lineages was estimated as somewhere between immediately after to several tens of millions of years after the split between angiosperms and extant gymnosperms. Estimates of the age of the most recent common ancestor of all extant angiosperms range from ~140–210 Ma, depending on the trees used and assumptions made. |
| Starting Page | 229 |
| Ending Page | 244 |
| Page Count | 16 |
| File Format | |
| ISSN | 09189440 |
| Journal | Journal of Plant Research |
| Volume Number | 117 |
| Issue Number | 3 |
| e-ISSN | 16180860 |
| Language | English |
| Publisher | Springer-Verlag |
| Publisher Date | 2004-05-12 |
| Publisher Place | Tokyo |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Amborella Floral homeotic genes Illicium Kadsura MADS Nymphaeales |
| Content Type | Text |
| Resource Type | Article |
| Subject | Plant Science |
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