Developmental and Structural Section
Evans, Rodger C. , Kramer, Elena M .
MADS-box Gene Expression in Rosaceae Flowers.
Once restricted to the study of Arabidopsis and Antirrhinum, using developmental genes for the study of plant evolution (evo-devo) has increased considerably over the past several years. The ABC(E) model of floral development, along with the apparent conservation of the genes that underpin this model, have allowed studies to move away from traditional model organisms in an effort to understand the developmental genetic basis for angiosperm floral diversity. The rose family (Rosaceae) present an interesting group in which to study developmental genes as their flowers produce a floral tube (hypanthium), and while most taxa have perigynous flowers some produce epigynous flowers through fusion of ovary and hypanthium. Our work uses patterns of ‘B’ (PISTILLATA(PI), APETALA3 (euAP3), and TOMATO MADS BOX GENE 6 (TM6) and ‘C’ (AGAMOUS (AG) and PLENA (PLE)) class gene expression as a means to study the genetic basis of hypanthium development, as well as differences between perigynous and epigynous flowers. The Rosaceae hypanthium is believed to be either appendicular (phylogenetic fusion of sepal, petal and stamen bases), or receptacular (extension of vegetative receptacle tissue) in origin. If the former, one possible outcome would be to observe ‘B’ and ‘C’ class expression in the developing hypanthium. Preliminary results show expression on the floral apex as it is pulled up with the developing hypanthium and second, third and fourth whorl organs are initiated. No distinct patterns of expression in hypanthium tissues are observed during its development. Our results are compared with previous analyses of floral development genes in Rosaceae.
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1 - Acadia University, Biology, 24 University Avenue, Wolfville, Nova Scotia, B4P 2R6, Canada
2 - Harvard Univerisity, Organismic and Evolutionary Biology, 16 Divinity Ave, Biolabs 1109, Cambridge, Massachusetts, 02138, USA
Presentation Type: Oral Paper:Papers for Sections
Date: Tuesday, July 29th, 2008
Time: 8:00 AM