Abstract
The morphology and anatomy of the flower of Dalechampia alata, as well as the chemical nature of the exudates secreted in the inflorescence were studied using light microscope. This is the first report showing the presence of colleters in the genus Dalechampia. In the staminate flower occur a group of small secretory glands. The histochemical results indicate that the substance secreted from the glands is lipidic and resinuous in nature, while in the colleters it consists of polysaccharides and lipid-rich substances. The ovule of D. alata are anatropous, subglobose and bitegmic. It presents obturator, micropyle occluded by nucellar beak and meristematic activity in the ovary wall. The secretion produced in the stigmatic and transmitting tissue consists of polysaccharides.
Highlights
The Euphorbiaceae exhibits a widespread distribution and is comprised of about 222 genera and 6100 species, but it is most diverse in tropical regions (Judd et al, 2009)
The goal of this study is to describe the morphology and anatomy of the flower of Dalechampia alata Klotzsch ex Baill., as well as the chemical nature of the exudates secreted in the inflorescence
Non-glandular and unicellular trichomes and colleters are present in the axils of the bracts
Summary
The Euphorbiaceae exhibits a widespread distribution and is comprised of about 222 genera and 6100 species, but it is most diverse in tropical regions (Judd et al, 2009). A diversity of secretory structures is involved in the production of different compounds from secondary metabolism, documented in a number of Euphorbiaceae species (Metcalfe and Chalk 1950). L., subfamily Acalyphoideae and tribe Plukenetieae, is the only genus of the subtribe Dalechampiinae (Tokuoka and Tobe, 2003) comprising approximately 120 species of lianas or rarely shrubs that are distributed throughout of the lowland tropics of the world (Armbruster et al, 2009). L., subfamily Acalyphoideae and tribe Plukenetieae, is the only genus of the subtribe Dalechampiinae (Tokuoka and Tobe, 2003) comprising approximately 120 species of lianas or rarely shrubs that are distributed throughout of the lowland tropics of the world (Armbruster et al, 2009). Armbruster (1996) calculated that approximately 90 species occur in the Neotropics, mostly in South America (Armbruster and Webster, 1981)
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