Deep Time Colloquium
Liu, Zhong , Hao, Gang , Luo, Yibo , Thien, Leonard , Rosso, Samuel , Lu, Anming , Chen, Zhiduan .
Phylogeny and androecial evolution in Schisandraceae inferred from sequences of nrDNA ITS and cpDNA trnL-F regions.
SEQUENCES of nrDNA ITS and chloroplast trnL-F regions were used to construct a phylogeny of Schisandraceae. The results show that there are two major clades in Schisandraceae, one is composed entirely of Schisandra species; however, the other contains a mixture of Schisandra and Kadsura species. Molecular data place Smith's section Sphaerostema of Schisandra prominently within Kadsura and thus neither Schisandra nor Kadsura is monophyletic, refuting the traditional division of the family into two genera based on morphological characters of mature fruits. The sister relationship between S. glabra (North America) and S. bicolor (China), and the monophyly of sect. Sphaerostema and sect. Kadsura are strongly supported. The trnL-F and combined data sets yield phylogenetic trees that are well resolved and concordant with androecial types of staminate flowers, however, they do not support the evolutionary pathways for androecia constructed by previous authors for Kadsura and Schisandra. The new alignment of species in Schisandraceae indicate that morphological characters traditionally used to construct phylogenetic relationships and evolutionary pathways, e.g., habit (deciduous vs. evergreen or semi-evergreen), fruit type (bacceta vs. separated apocarps), arrangement of flowers (solitary vs. paired or in glomerules), and pollen (3-colpate vs. 6-colpate), evolved more than once in the family. Preliminary observations suggest that the androecium and gynoecium of Schisandra glabra and Kadsura longipedunculata are thermogenic and heat may play a role in the reproductive biology of Schisandraceae to enhance floral odor or simulate the temperature of brood sites for many types of insects.[c.e.:srb]
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1 - Chinese Academy of Sciences, Institute of Botany, State Key Laboratory of Systematic and Evolutionary Botany, Haidian District, 20 Nanxincun, Xiangshan, Beijing, 100093, China
2 - South China Botanical Garden, the Chinese Academy of Sciences, Guangzhou, 510650, China
3 - Tulane University, Cell & Molecular Biology Department, 6823 St Charles Avenue, New Orleans, Louisiana, 70118, USA
4 - University of Southern Mississippi, Department of Biological Sciences, Po Box 5018, Hattiesburg, Mississippi, 39406-5018, USA
Presentation Type: Symposium or Colloquium Presentation
Location: 206/Performing Arts Center
Date: Tuesday, August 1st, 2006
Time: 11:00 AM