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Developmental and structural features of secretory canals in root and shoot wood of Copaifera langsdorffii Desf. (Leguminosae–Caesalpinioideae)

Abstract

Copaifera langsdorffii Desf., popularly known as copaíba, is an oleoresin-producing tree has been overexploited in Brazil by the pharmaceutical, cosmetic and varnish industries. Despite the long history of the use of this species, the structural knowledge on the resin-producing sites remains inadequate and is limited to the trunk. The aim of this study was to describe the origin, structure and developmental features of secretory spaces present in shoot and root wood of C. langsdorffii, based on the usual techniques of wood anatomy studies. Both root and shoot wood present secretory canals distributed along the marginal parenchyma bands which delimit growth layers. Secretory canals are constituted by a locally biseriate epithelium and lume that contains terpenes. They are arisen in the cambial zone from fusiform cambial initial cells and, eventually, ray initials. The origin of lumen is schizogenous. The epithelial cells have meristematic potential and are responsible for the locally biseriate epithelium. Mature secretory canals are wider and are separated between themselves only by a row of radial cells. The fusion of these adjacent secretory canals is frequent and results from the radial cell collapse. The finding of an interconnected system of resin canals in C. langsdorffii might be of value in terms of sustainable extraction of the resin and realistically assess its sustainable harvest potential.

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Acknowledgments

We are grateful to FAPESP (Fundação de Amparo à Pesquisa do Estado de São Paulo—Proc. DR 05/60086-0) and CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico—Proc. 470643/2006-4) for the financial support. We also thank Doctor Carmen Regina Marcati and the technical team of the Wood Anatomy Laboratory of the Department of Forest Sciences at the Faculty of Agronomic Sciences, FCA, UNESP, Botucatu, for their assistance in the preparation of samples.

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Correspondence to Tatiane Maria Rodrigues.

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Communicated by P. von Aderkas.

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Rodrigues, T.M., Machado, S.R. Developmental and structural features of secretory canals in root and shoot wood of Copaifera langsdorffii Desf. (Leguminosae–Caesalpinioideae). Trees 23, 1013–1018 (2009). https://doi.org/10.1007/s00468-009-0343-y

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  • DOI: https://doi.org/10.1007/s00468-009-0343-y

Keywords

  • Anatomy
  • Copaifera langsdorffii
  • Oleoresin
  • Secondary xylem
  • Secretory canals