Comparación de caracteres epidérmicos entre Allenrolfea patagonica (MOQ.) KUNTZE y Nitrophila australis CHODAT & WILCZEK var. australis

PÉREZ CUADRA, V.; HERMANN, P.

Ciudad Autónoma de Buenos Aires

Jornada; VIII Jornadas Multidisciplinarias de la Sociedad Argentina de Biología; 2006

Sociedad Argentina de Biología

A. patagonica and N. australis have different leaf arrangements on the stem: they are appressed in the former, exposing its abaxial surface to the environment, whereas in the latter, both surfaces are equally exposed. It is intended to determine whether foliar arrangement produces any effect on the epidermal morphology. Leaves were gathered at the Salitral de la Vidriera (Prov. Bs. As.), fixed in FAA and sectioned manually. Later, they were subdued to a weak dissociation. In N. australis the abaxial epidermis contains elongated cells and the stomata tend to be distributed in rows, while the adaxial epidermis shows polygonal cells and the stomata locate at random. In A. patagonica the abaxial epidermis is composed of somewhat circular cells and the subsidiary cells form rings that delimit pores; the guard cells are located below the rings. The adaxial epidermis consists of variously shaped cells and the rings delimited by the subsidiary cells are not well defined. In both surfaces the epidermal cells show various kinds of papillae. The stomatal index of each epidermal surface was compared with an ANOVA test in both species; this allows to affirm, with p