Nectar spur evolution in the Mexican lobelias (Campanulaceae: Lobelioideae)
| العنوان: | Nectar spur evolution in the Mexican lobelias (Campanulaceae: Lobelioideae) |
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| المؤلفون: | Tina J. Ayers, Margaret M. Koopman |
| المصدر: | American Journal of Botany. 92:558-562 |
| بيانات النشر: | Wiley, 2005. |
| سنة النشر: | 2005 |
| مصطلحات موضوعية: | Systematics, food.ingredient, Lobelioideae, Campanulaceae, biology, food and beverages, Lobelia, Plant Science, biology.organism_classification, food, Evolutionary biology, biology.animal, Botany, Genetics, Nectar, Hummingbird, Internal transcribed spacer, Heterotoma, Ecology, Evolution, Behavior and Systematics |
| الوصف: | Phylogenetic studies are often hampered by the independent evolution of characters that may potentially obscure relationships. The adaptive significance of the nectar spur and its evolution within the Mexican lobeliads (Campanulaceae) is considered here. The taxonomic delimitations of Heterotoma from the Mexican species within the genera Lobelia and Calcaratolobelia were tested. Independent molecular data were gathered to determine whether the Mexican spurred lobeliads should be treated as distinct genera. The internal transcribed spacer (ITS) region from 18-26S nuclear rDNA and chloroplast DNA from the 3' trnK intron were sequenced from 14 representative species. Our data suggest that Heterotoma, as originally conceived, is a good evolutionary unit within Lobelia and that the presence of a nectar spur is an important morphological character that can be used in defining phylogenetic position. This study also suggests that morphological changes associated with hummingbird pollination have evolved more than once in the Mexican lobeliads, from small blue-flowered, insect-pollinated relatives. |
| تدمد: | 1537-2197 0002-9122 |
| DOI: | 10.3732/ajb.92.3.558 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::dbfa2c661488db4df633a12ec5035247 https://doi.org/10.3732/ajb.92.3.558 |
| رقم الانضمام: | edsair.doi.dedup.....dbfa2c661488db4df633a12ec5035247 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 15372197 00029122 |
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| DOI: | 10.3732/ajb.92.3.558 |