Academic Journal
Molecular phylogeny and biogeography of Androsace (Primulaceae) and the convergent evolution of cushion morphology
| العنوان: | Molecular phylogeny and biogeography of Androsace (Primulaceae) and the convergent evolution of cushion morphology |
|---|---|
| المؤلفون: | Wang, YJ, Li, XJ, Hao, G, Liu, JQ |
| سنة النشر: | 2004 |
| المجموعة: | Northwest Institute of Plateau Biology: NWIPB OpenIR (Chinese Academy of Sciences) / 中国科学院西北高原生物研究所机构知识库 |
| مصطلحات موضوعية: | Science & Technology, Life Sciences & Biomedicine, DNA SUBSTITUTION, CHLOROPLAST DNA, GENE RBCL, MYR AGO, TIBET, ASTERACEAE, SEQUENCES, Plant Sciences |
| الوصف: | Androsace L. consists of more than 100 species distributed mainly in northern temperate areas. This genus, typically characterized by having small flowers with a constricted corolla throat, was subdivided into six sections: sect. Samuelia Schlechtd., sect. Mirabiles (Hand. -Mazz.) Yang & Huang, sect. Androsace, sect. Chamaejasme Koch., sect. Aizoidium Hand. -Mazz., and sect. Orthocaulon Hand. -Mazz. In this genus, the species with cushion-like growth belong to sect. Chamaejasme occurring in alpine habitats. There are other three small genera in the tribe Androsaceae. Pomatosace Maxim., with only one species, P. filicula Maxim., endemic to Qinghai-Tibetan Plateau, is traditionally placed in the subtribe Soldanellinae because of its circumscissile capsules, but other morphological characters and the recently reported evidence from cytology indicate that its affinity is closer with Androsace. Douglasia Lindley has eight homogeneous species in Northern American mountains. Vitaliana Sesler, with only one species in the European Alps, is usually considered a congener of Douglasia. These four genera, morphologically similar in having small flowers with a constricted corolla throat and "Androsace pollen", referred here as "Androsace group", am disjunctly distributed from the Qinghai-Tibetan Plateau, to Central- and Northern-Asia, Europe and North America. It is an ideal group to elucidate the origin and dispersal patterns of the Northern Hemisphere flora, which has a distribution center in the eastern Qinghai-Tibetan Plateau and the Hengduan Mountains. In addition, the habits of this group range from annuals to rosette perennials and cushion-like perennials. The cushion-like species are disjunctly distributed in the central Qinghai-Tibetan Plateau and European Alps mountains. Further studies are needed to determine whether they are closely related to each other or it is only the result of convergent evolution under the habitat pressure selection in separate sites. |
| نوع الوثيقة: | article in journal/newspaper report |
| اللغة: | English |
| Relation: | ACTA PHYTOTAXONOMICA SINICA; http://210.75.249.4/handle/363003/6844 |
| الاتاحة: | http://210.75.249.4/handle/363003/6844 |
| رقم الانضمام: | edsbas.562A27F3 |
| قاعدة البيانات: | BASE |
| الوصف غير متاح. |