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Abstract Detail


Evolutionary Developmental Biology (Evo-Devo)

Buzgo, Matyas [1], Liang, Haying [2], Schlarbaum, Scott E. [3], DiLoreto, D. Scott [2], Carlson, John [4], Soltis, Pamela S. [5], Soltis, Douglas E. [1].

Floral development in Liriodendron tulipifera L. (Magnoliaceae) and other basal angoisperms.

THE developmental series of the flower of Liriodendron tulipifera is presented and compared with other basal angiosperms (Magnoliaceae, Lauraceae, basal monocots, Amborella, Nymphaeaceae). After a single bract-like organ is produced, phyllotaxy changes from spiral to whorled. At the initiation of stamens, the floral shoot apical meristem is remarkably enlarged compared to other basal angiosperms. The transition to carpels is abrupt. As a result of the enlarged floral apical meristem, the adaxial cross meristem of the carpels is fused to the floral shoot axis (leaving the plicate portion free). Similar fusions of floral axis and the adaxial side of the carpels are observed in other basal angiosperms and monocots (Nymphaeaceae, Illicium, Triglochin) and support the hypothesized involvement of main shoot components into the adaxial carpel portions, as suggested by observations in Amborella. The enlargement of the floral apical meristem is one of four inflorescence architectures recurring in basal angiosperms: [1] a large flower with multiple organs often starting as whorls, later seemingly irregular along a convex elongated floral apex (floral dome; Liriodendron, Magnolia, Nuphar); [2] like [1], but the floral axis is concave and expanded peripherally (cup-shaped receptacle; some Nymphaeaceae); [3] several smaller flowers arranged in a determinate inflorescence (thyrse), often also with an irregular number of floral organs or trimerous, and with a cup-shaped receptacle similar to [2] (some Laurales, Amborella); [4] an extreme reduction of single flowers and their congregation to a dense determinate inflorescence (see [3]) which starts as a large meristem with rapid initiation of lateral organs (similar to the floral dome in [1]) and is terminated by a pseudanthium (Saururaceae, Acoraceae, some Juncaginaceae).


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1 - University of Florida, Department of Botany, 220 Bartram Hall, P.O. Box 118526, Gainesville, Florida, 32611-8526, USA
2 - Pennsylvania State University, 304 Wartik Laboratory, University Park, Pennsylvania, 16802, USA
3 - The University of Tennessee, Forestry, Wildlife & Fisheries, Knoxville, Tennessee, 37996-4563, USA
4 - Pennsylvania State University, School of Forest Resources, University Park, Pennsylvania, 16802, USA
5 - University of Florida, Department of Botany, Florida Museum of Natural History, P.O. Box 117800, Gainesville, Florida, 32611-7800, USA

Keywords:
Evolutionary development
comparative floral morphology
flower-inflorescence boundary
Terminal flower
Organ identity
Floral development.

Presentation Type: Oral Paper:Papers for Topics
Session: 52-7
Location: 303/Bell Memorial Union
Date: Tuesday, August 1st, 2006
Time: 4:00 PM
Abstract ID:617


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