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Abstract Detail



Developmental and Structural Section

Gutierrez, Jessel [1], Cohen, Jim [2].

Comparative floral development of heterostylous species.

Heterostyly, a complex and elegant breeding system, is characterized by the presence of two or three floral morphs that exhibit reciprocal herkogamy. Heterostyly is known to be present in 28 families of flowering plants, and it is hypothesized to have originated independently in each. The development of the two morphs of heterostylous species has been shown to differ among families, but these developmental patterns have only been studied in a small number of families. The present study involves a comparison of floral development patterns of five heterostylous species from four families: Oreocarya flava, Oreocarya paysonii (both Boraginaceae), Salvia brandegeei (Labiatae), Aliciella heterostyla (Polemoniaceae), and Fagopyrum esculentum (Polygonaceae). With the use of light microscopy, patterns of macroscopic floral development were observed and compared between morphs and among species. In most species, anther height differs between morphs due to different, morph-specific rates of growth of the corolla tube and filaments; however, in F. esculentum the growth rate of the filaments of the long-style morph slows in the latter half of development, while that of the filaments of the short-style morph grows at a constant rate throughout development. For stigma height, in the short-style morph of most species the rate of growth of the style slows or ceases later in development, while the rate of growth of the style is constant in the long-style morph. In A. heterostyla and F. esculentum, the styles of the two morphs grow at different rates.

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1 - Texas A&M International University
2 - 7614 Laguna Del Mar Ct., Apt. 214, Laredo, TX, 78041, USA

Keywords:
Heterostyly
Boraginaceae
Lamiaceae
Polemoniaceae
Polygonaceae
Floral development.

Presentation Type: Poster:Posters for Sections
Session: P
Location: Grand Salon A - D/Riverside Hilton
Date: Monday, July 29th, 2013
Time: 5:30 PM
Number: PDS013
Abstract ID:592
Candidate for Awards:None


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