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Abstract Detail



Developmental and Structural Section

Saenz, Erika [1], Cohen, Jim [2].

Comparative gynoecial development in Boraginales.

Gynoecia in Boraginales are quite variable, ranging from gynobasic styles with one to four stigmas in Boraginaceae to apically attached styles with two stigmas in Ehretiaceae. Comparing the developmental patterns that give rise to these distinct gynoecia can shed light on floral evolution within the order; therefore, the development of the gynoecia of four species of Boraginales (Lappula texana [Boraginaceae], Ehretia anaqua [Ehretiaceae], Heliotropium curassavicum [Heliotropiaceae], and Phacelia sp. [Hydrophyllaceae]) was investigated and compared. For each species, flowers at various stages of development were sectioned, mounted, and stained utilizing standard plant histology methodology, and using light microscopy, developmental patterns of the gynoecia were described. Similar patterns of early gynoecium development were observed in all species, with two small primordial lobes developing and fusing into the two carpels of the gynoecium; however, differences were apparent. L. texana develops a gynobasic style and distinct winged ovaries, while all other species bear a style attached to the apex of the ovary. In H. curassavicum and Phacelia sp., transverse sections of the gynoecia revealed similar anatomical structures. These data suggest a close relationship between members of these two families, although longitudinal sections provided noticeable differences. These differences include a united style with a unique arrow-shaped stigma in H. curassavicum, whereas Phacelia sp. bears two styles terminating in globular stigmas. Longitudinal sections of E. anaqua and Phacelia sp. demonstrate that the gynoecia of both species develop slightly asymmetrically and have lobed stigmas.

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

Keywords:
gynoecium structure
Gynoecium development
Boraginales.

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: PDS012
Abstract ID:573
Candidate for Awards:None


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