Internal secretory spaces in thickened underground systems of Asteraceae species
Graziela Cury A and Beatriz Appezzato-da-Glória A BA PO Box 09, 13418-900, Piracicaba, São Paulo, Brazil.
B Corresponding author. Email: bagloria@esalq.usp.br
Australian Journal of Botany 57(3) 229-239 https://doi.org/10.1071/BT08139
Submitted: 1 August 2008 Accepted: 7 May 2009 Published: 29 June 2009
Abstract
Secretory structures are present in many vascular plants and have an important ecological role as a plant defence mechanism against herbivors and pathogens. Internal secretory spaces of lipid substances are widespread in the Asteraceae. However, information about the occurrence of these structures in thickened underground systems is sparse, compared with what we know about aerial systems. The main objective of the present paper was to investigate the occurrence, formation and chemical nature of the secretory structures in six Asteraceae species belonging to the following tribes: Eupatorieae (Mikania cordifolia and M. sessilifolia), Mutisiae (Trixis nobilis), Plucheeae (Pterocaulon alopecuroides) and Vernonieae (Vernonia elegans and V. megapotamica). The samples were collected in areas of Cerrado (tropical savanna) in the state of São Paulo, Brazil. The secretory structures found were cortical canals in roots (T. nobilis, P. alopecuroides, V. elegans and V. megapotamica), cortical cavities in roots (M. cordifolia, M. sessilifolia and P. alopecuroides), cavities in the secondary phloem of roots (T. nobilis), cortical cavities in the xylopodium (M. cordifolia, M. sessilifolia, P. alopecuroides and V. megapotamica) and in the underground stem (T. nobilis), and canals in the secondary xylem in the xylopodium (M. cordifolia and M. sessilifolia). Histochemical tests showed the presence of lipid substances in all structures.
Acknowledgements
We are grateful to FAPESP (Process 00/12469-3) for the financial support, and CAPES and CNPq for the grants. We also thank Instituto de Botânica and Instituto Florestal for giving us permission to collect plant material, Professor Vinícius C. Souza (USP) for identifying plant species and Dr Alessandra T. Fidelis, Chair of Vegetation Ecology (Technische Universität München, Germany) for reviewing the English and for comments.
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