Developmental and Structural Section
Pabon Mora, Natalia , Gonzalez, Favio .
Floral development of Aristolochia fimbriata Chamisso (Piperales: Aristolochiaceae: Aristolochioideae) as an attractive candidate for Evo-Devo studies among herbaceous Magnoliids.
Aristolochia fimbriata is a procumbent herb that grows in temperate South America. The species belongs to a neotropical clade recognized by the presence of fully developed prophylls, solitary, axillary flowers, a 6-merous gynostemium lacking a transversal process between anthers and stigmatic lobes, and an acropetal capsule with many unwinged seeds. Flowers of A. fimbriata exhibit all the synapomorphies for the subgenus Aristolochia, to which it belongs (e.g. the perianth concavity towards the upper flank of the flower, and conical trichomes on the inside of the perianth tube). Developmental studies show a rapid floral differentiation and a monosymmetric perianth. Monosymmetry restricted to the perianth (not the gynostemium) occurs by: (a) an early monosymmetric floral primordium undergoing differential degrees of fusion between the median and the lateral sepal primordia (b) an unequal elongation of the upper vs. the lower flanks of the perianth. The gynostemium forms by early fusion of the anthers and the commissural, bifid stigmatic lobes. Fimbriae (likely with apical osmophores) are formed from the margins of the yellow and purple limb. Epidermal cells vary from flattened and isodiametric, to papillate and elongated; four types of trichomes are found in the perianth: two nectarial types of pluricellular, uniseriate trichomes inside the utricle; thick, pluricellular conical trichomes inside the tube; and tricellular, uncinate trichomes on the limb and the fimbriae. Epidermal cells may play a role in the color pattern of the adaxial limb. A. fimbriata is an attractive candidate for studies in molecular biology because it is a¬†self-compatible herb with elaborate flowers, high seed germination, low genome size and low chromosome number (2n=14). Additionally, VIGS are being asessed as a gene silencing technique for this non-model species.
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1 - Graduate Center CUNY/ New York Botanical Garden, Plant Sciences, 200th St and Southern Blvd, Plant Research Laboratory, Bronx, NY, 10458, USA
2 - Universidad Nacional de Colombia, Ap Ae 7495, Bogota, Colombia
Presentation Type: Poster:Posters for Sections
Location: Ball Room & Party Room/SUB
Date: Monday, July 28th, 2008
Time: 12:30 PM