title: Morpho-anatomy and ontogeny of the underground system of Chrysolaena simplex (Less.) Dematt. (Asteraceae).
abstract: The occurrence of thickened underground systems in Asteraceae is widely reported in the literature. Given the great complexity of underground systems, which may originate from roots, stems, or both, morpho-anatomical analyses are essential to ensure the use of correct terminology. The goals of this study were to describe the morpho-anatomy and ontogeny, investigate the occurrence of secondary metabolites and evaluate the effects of seasonality on the underground system of Chrysolaena simplex (Less.) Dematt. Samples were studied using standard protocols of plant anatomy, scanning electron microscopy, histochemical and phytochemical. The underground system of C. simplex was categorised as a rhizophore which started from cotyledonary node. In adult individuals, with rhizophores completely developed, the primary roots degenerated and adventitious radicular systems are formed. The buds in the subterranean portions promote the rhizophore growing, and form aerial stems when exposed to light. Lipophilic droplets were evident in the parenchymatous cells of the cortex and pith, endodermis and buds. Inulin-type fructans were observed in the stem axis and buds of the rhizophore. The presence of buds, secondary metabolites and the storage of fructans and lipids in the rhizophore can be seen as adaptive traits.
authors.affiliation: Instituto de Ciências Biológicas, Universidade Federal de Goiás, Goiânia, GO, Brasil.
authors.forename: Vanessa S
authors.initials: VS
authors.lastname: Santos
authors.affiliation: Instituto de Ciências Biológicas, Universidade Federal de Goiás, Goiânia, GO, Brasil.
authors.forename: Vinicius P
authors.initials: VP
authors.lastname: Souza
authors.affiliation: Instituto de Ciências Biológicas, Universidade Federal de Goiás, Goiânia, GO, Brasil.
authors.forename: Divina A A
authors.initials: DA
authors.lastname: Vilhalva
authors.affiliation: Instituto de Ciências Biológicas, Universidade Federal de Goiás, Goiânia, GO, Brasil.
authors.forename: Fernanda P S
authors.initials: FP
authors.lastname: Ferreira
authors.affiliation: Faculdade de Farmácia, Instituto de Ciências Biológicas, Universidade Federal de Goiás, Goiânia, GO, Brasil.
authors.forename: José R
authors.initials: JR
authors.lastname: Paula
authors.affiliation: Instituto de Ciências Biológicas, Universidade Federal de Goiás, Goiânia, GO, Brasil.
authors.forename: Maria Helena
authors.initials: MH
authors.lastname: Rezende
mesh_terms: D000222:Adaptation, Physiological; D019659:Asteraceae / Q000033:anatomy & histology* / Q000502:physiology; D018517:Plant Roots / Q000033:anatomy & histology* / Q000502:physiology