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Wolff, Doris ; Liede-Schumann, Sigrid:
Evolution of flower morphology, pollen dimorphism, and nectar composition in Arcytophyllum, a distylous genus of Rubiaceae.
In: Organisms Diversity & Evolution.
Bd. 7
(2007)
Heft 2
.
- S. 106-123.
ISSN 1618-1077
DOI: https://doi.org/10.1016/j.ode.2006.02.005
Abstract
A phylogenetic study of Arcytophyllum based on ITS was conducted and compared with an earlier study based on cpDNA. The position of the widespread A. thymifolium as sister to all other species was confirmed and several well-supported clades could be retrieved. The Central American A. lavarum is well embedded between exclusively or predominantly South American species. To understand the expression of heterostyly in the genus, we analyzed inter- and intraspecific variation in floral morphology, nectar, pollen-ovule-ratio and seed set of ten species in eleven populations. Stigma and anther levels differed significantly between the morphs in the species/populations investigated except for A. filiforme. Different expressions of heterostyly in Arcytophyllum seem independent of phylogenetic relationships. Nectar sugar composition was similar between the morphs. Nectar of most species presented a larger proportion of hexoses than of sucrose, only the most derived species, A. macbridei and A. vernicosum, have higher sucrose proportions. There is a significant positive correlation between corolla tube length and the proportion of sucrose. Pollen dimorphism, both with regard to the number (long-style > short-style) and to the size (short-style > long-style) was observed in all taxa investigated except for A. filiforme. According to the pollen-ovule-ratios the breeding systems range from facultative autogamy to facultative xenogamy, independent of phylogenetic relationsship. The main floral visitors of the species studied were Hymenoptera, Diptera and Coleoptera. Seed production did not differ significantly between the morphs in eight of the eleven species/populations investigated. There is, however a tendency in all species/populations (except for A. macbridei Peru) that the short-styled morph had a higher percentage of seeds per ovule indicating that the short-styled morphs display higher female reproductive success.
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| Publikationsform: | Artikel in einer Zeitschrift |
|---|---|
| Begutachteter Beitrag: | Ja |
| Zusätzliche Informationen: | BAYCEER52478 |
| Institutionen der Universität: | Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Biologie > Lehrstuhl Pflanzensystematik Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Biologie > Lehrstuhl Pflanzensystematik > Lehrstuhl Pflanzensystematik - Univ.-Prof. Dr. Sigrid Liede-Schumann Forschungseinrichtungen > Forschungszentren > Bayreuther Zentrum für Ökologie und Umweltforschung - BayCEER Fakultäten Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Biologie Forschungseinrichtungen Forschungseinrichtungen > Forschungszentren |
| Titel an der UBT entstanden: | Ja |
| Themengebiete aus DDC: | 500 Naturwissenschaften und Mathematik |
| Eingestellt am: | 14 Jul 2015 06:22 |
| Letzte Änderung: | 17 Jan 2020 08:27 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/16410 |