Recent Topics Posters
PENAGOS ZULUAGA, JUAN C .
Evaluation of the relationship of Aiouea with Cinnamomum, Ocotea and Mocinnodaphne (Lauraceae) using epidermal leaf characters.
This study was designed to evaluate the relationship of species of Aiouea to specie of Cinnamomum, Ocotea, and Mocinnodaphne (Lauraceae) using leaf epidermal characters. The three genera had been suggested to be related based on a previous molecular study. This study includes thirty-eight neotropical species of Aiouea, Cinnamomum, Ocotea and Mocinnodaphne Samples examined were assessed under light microscopy and scanning electron microscopy, and characters were scored from digital images of samples. A stomatal rim made by a thickness of the cuticle around the stomata was identified for thirty-six species. A principal component analysis and means test were performed to evaluate the suitability of the characters to distinguish groups. Only the stomatal rim width was found to distinguish the groups, although other epidermal characters either had high loadings in the PCA or had significantly different means. Three groups were recognized. The first group has a broad stomatal rim and includes all the species of Aiouea from South America, Cinnamomum from central and South America, and Mocinnodaphne In addition, all the species of this group have conspicuous staminodes in the fourth whorl and a thick leaf margin. The second group has a narrow stomatal rim and includes all the species of Aiouea distributed in Central America with the species of O. insularis group distributed in Central America and northwest of South America. All the species belonging to this group have trichomes in the abaxial side of the third whorl of the stamens and a strictly cymose flattened inflorescence. The third group includes two species (A. guatemalensis and A. inconspicua) without a stomatal rim. These two species are the northern distribution range of Aiouea and lack both the cymose inflorescence with flattened branches and the trichomes in the stamens. In conclusion, epidermal characters still provided information useful in taxonomy of Lauraceae.
Log in to add this item to your schedule
1 - University of Missouri St.Louis- UMSL, Biology, One University Blvd, Department of Biology - R223 Research Building, St. Louis, MO, 63121-4400, USA
Leaf epidermal anatomy.
Presentation Type: Recent Topics Poster
Location: Hall A/Convention Center
Date: Monday, August 2nd, 2010
Time: 5:30 PM