Jones, Eric .
Reciprocal herkogamy in Houstonia procumbens a heterostylous, cleistogamous species.
Heterostyly represents a case of convergent evolution among angiosperms for floral adaptations that promote outcrossing. The mechanism by which heterostyly achieves this is the reciprocal placement of anthers and stigmas (reciprocal herkogamy) in two or three morphs of a given population. This reciprocal herkogamy is usually accompanied by a biochemical self-incompatibility. Thus, how much the degree and precision of reciprocal herkogamy varies without a self-incompatibility mechanism has seldom been investigated. In the genus Houstonia (Rubiaceae) there exists a species (H. procumbens) that is unique in that it is both heterostylous and cleistogamous (i.e. it produces both open flowers available for outcrossing and closed flowers that obligately self-pollinate). The degree and precision of reciprocity for this species will be described from several populations of H. procumbens and compared to that of two closely related heterostylous species, H. caerulea and H. longifolia, both of which exhibit self-incompatibility mechanisms and are non-cleistogamous. The purpose of this investigation is to determine whether the presence of cleistogamy and lack of self-incompatibility in H. procumbens affects the degree and precision of reciprocal herkogamy found in H. procumbens relative to closely related taxa.
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1 - Florida State University, Department of Biological Sciences, Tallahasse, Florida, 32306-1100, USA
Presentation Type: Poster:Posters for Topics
Location: Hall A/Convention Center
Date: Monday, August 2nd, 2010
Time: 5:30 PM