Photo credit: Scielo
Leaf epidermis and stomata under scanning electron microscopy. 3A: G. virgata adaxial epidermis with striae also over the secondary order vein (white arrow) and fungi hyphae (arrow head). 3B: G. arborescens stoma and epicuticular wax (black arrow). 3C: G. pohlii stoma. 3D: G. virgata stoma. 3E: G. globosa stoma.
Photo credit: Google
Leaf surfaces of Gomphrena spp. (Amaranthaceae) from Cerrado biome
by Fank-de-Carvalho S. M., Rodrigues de Aguiar Gomes M., Tanno Silva P. I., Nair Báo S. (2010)
Suzane Margaret Fank-de-Carvalho, Misléia Rodrigues de Aguiar Gomes, Pedro Ítalo Tanno Silva, Sônia Nair Báo
Departamento de Biologia Celular, Laboratório de Microscopia Eletrônica, Universidade de Brasília, Campus Universitário Darcy Ribeiro, Instituto de Ciências Biológicas. CEP 70919-970, Brasília/DF, Brasil.
in Biocell vol.34 no.1 Mendoza ene./abr. 2010
The leaf structure and micromorphology characterize plant species and reflex its interactions with the environment. Leaf epidermis sculptures aid high transpiration plants on light reflection. The form and distribution of epicuticular wax crystalloids are important to characterize the surface.
Aiming to know the micromorphology and the ultrastructure of G. arborescens,G. pohlii and G. virgata, leaves of these Cerrado native species were collected in Brasília, Distrito Federal, Brazil, at the Olympic Center of the Universidade de Brasília and at Reserva Ecológica do Roncador. Leaves of G. globosa, an Indian native species, were also studied for comparison.
Leaves were fractionated, fixed and treated for observation under optical and scanning electron microscope. A description of the leaf epidermis is provided, along with some quantitative data to help the species taxonomy and support future studies on their physiology: all species are amphistomatic and have Stomatal Index between 7.27 and 18.99.
The Gomphrena spp. studied have epicuticular wax platelets and wax sculptures over their larger trichome, which are relevant for their taxonomy. Over the Cerrado species cuticle, epicuticular wax is damaged by fungi hyphae development. The presence of epicuticular wax on Gomphrena spp. leaves corroborates the phylogenetical alliance between Amaranthaceae and Chenopodiaceae.
Read the full article: Scielo