Abstract
The Dipsacales is an order of plants that exhibits a striking shift from radial symmetry in basal lineages like viburnum to strong bilateral symmetry in species like honeysuckle. We are interested in determining how multiple copies of the transcription factor CYCLOIDEA (CYC) may be linked to floral symmetry shifts across Dipsacales. We use quantitative reverse transcriptase PCR (qPCR) to compare relative expression levels of the major copies of CYC (CYC1, CYC2, CYC3) across Dipsacales in seven different species exhibiting radial symmetry, bilateral symmetry, or asymmetry. Our data suggest that radially symmetric species do not exhibit wide variation in expression among petals, whereas bilateral and asymmetric flowers have pronounced differences, especially in CYC2 copiesResearch supported by NSF IOS grant 1121301.
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