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Abstract Detail



Systematics Section/ASPT

Cohen, Jim [1].

The Evolution of Heterostyly in Boraginaceae.

The breeding system heterostyly is characterized by two or three floral morphs that exhibit reciprocal herkogamy, self- and intramorph incompatibility, and micromorphological differences. Heterostyly arose independently in over 25 families of flowering plants, but different patterns for the origin of the breeding system have not been critically investigated within most families. The medium-sized family Boraginaceae includes multiple species, distributed among three tribes, that exhibit heterostyly. Using phylogenetic and floral development studies, the evolutionary origin of heterostyly within the family has been investigated. A phylogeny of Boraginaceae based on four DNA regions and organismal character data provides evidence of at least eight to twelve origins of heterostyly within the family, with different ancestral types of herkogamy are resolved for species from the three tribes. Floral developmental data of three studied heterostylous species demonstrate that each species has a distinct pattern of development for the two morphs. Comparative transcriptomics for the flowers of the two morphs of the heterostylous species Lithospermum multiflorum provides evidence of differential gene expression at various stages of floral development. Transcriptome data from other species of Boraginaceae will allow for additional comparisons at the molecular level to be made among heterostylous species of the family.


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Keywords:
Boraginaceae
Heterostyly
Distyly
Evolution.

Presentation Type: Oral Paper:Papers for Sections
Session: 47
Location: Salon 3/The Shaw Conference Centre
Date: Tuesday, July 28th, 2015
Time: 1:30 PM
Number: 47001
Abstract ID:383
Candidate for Awards:None


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