Developmental and Structural Section
Bachelier, Julien B. , Endress, Peter K. .
Comparative floral morphology and anatomy of Anacardiaceae and Burseraceae, with a special focus on the evolution of gynoecium and ovule.
THE systematic position of Julianiaceae and Blepharocaryaceae, as well as the ordinal affinities of Anacardiaceae and Burseraceae, were uncertain for a long time. Recently, molecular phylogenetic studies supported the position of Julianiaceae and Blepharocaryaceae within Anacardiaceae and also indicated that Anacardiaceae and Burseraceae form a well-supported clade, nested within Sapindales. Usually, Anacardiaceae and Burseraceae are distinguished on the basis of the ovule number and orientation in the ovary locules. While floral morphology and anatomy were studied in some detail in Anacardiaceae, mainly in genera of economic importance or from temperate regions, Burseraceae remained poorly known and a broad comparative study of their floral structures is lacking. We thus studied the reproductive structures of both Anacardiaceae (including Julianiaceae and Blepharocaryaceae) and Burseraceae in order to find structural support for their sister relationship and their position within Sapindales. We also aimed to have a better understanding of the evolution of the reproductive structures in each family. Our preliminary results indicate that there is a broad diversity of gynoecium structure, in both carpel number and degree of synorganisation. In addition, the outer integument of the ovules is unusually plastic in both families and, especially in Anacardiaceae, unusual appendages without any correspondence in other angiosperms sometimes develop in the funicular region. However, the lack of resolution of the actual phylogenies makes evolutionary interpretation difficult at the generic level. These ovules, apart from the systematic interest, might also represent an interesting topic for evo-devo studies on the mechanisms involved in the reduction of the integument number.
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1 - Universität Zürich, Institut für Systematische Botanik, Zollikerstrasse 107, Zürich, CH-8008, Schweiz
Comparative floral morphology
Presentation Type: Oral Paper:Papers for Sections
Location: 303/Bell Memorial Union
Date: Wednesday, August 2nd, 2006
Time: 11:15 AM