Jones, Eric .
Reciprocal herkogamy in Houstonia species, an examination of metrics of floral organ reciprocity.
Heterostyly represents a case of convergent evolution among angiosperms for floral adaptations that promote outcrossing. Outcrossing in heterostylous populations is the result of selection for reduced pollen discounting by way of the reciprocal placement of anthers and stigmas (reciprocal herkogamy) and the presence of a biochemical self-incompatibility mechanism that prevents self and intra-morph crosses. In the genus Houstonia (Rubiaceae) there exists a species (H. procumbens) that is possibly unique in that it is both heterostylous and cleistogamous (i.e. it produces both chasmogamous (open) flowers that are distylous and cleistogamous (closed) flowers that obligately self-pollinate). The degree of reproductive organ reciprocity for H. procumbens will be described and compared to that of two closely related heterostylous species, H. caerulea and H. longifolia, both of which are distylous and non-cleistogamous. Results for Houstonia species will be compared to those reported for other distylous and style polymorphic taxa in order to examine the metrics employed to assess reproductive organ polymorphisms.
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1 - Florida State University, Department Of Biological Sciences, Florida State University, Tallahassee, FL, 32306-4295, USA
Presentation Type: Oral Paper:Papers for Topics
Location: Delaware D/Hyatt
Date: Wednesday, July 11th, 2012
Time: 4:30 PM