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Plant Systematics and Evolution

, Volume 298, Issue 1, pp 25–32 | Cite as

The leaf secretory scales of Combretum molle (Combretaceae): morphology, ultrastructure and histochemistry

  • Yougasphree NaidooEmail author
  • Samia HeneidakEmail author
  • Sanjay Gairola
  • Ashley Nicholas
  • Gonasageran Naidoo
Original Article

Abstract

This paper reports the results of a study on the morphology, mode of secretion, ultrastructure and histochemistry of leaf secretory scales of Combretum molle using both light and electron microscopy. The density of the secretory scales is higher on the abaxial leaf surface in the intervein areas. Each secretory scale is made up of a basal epidermal cell, a short bicellular stalk and a multicellular umbrella-like head comprising 8–24 cells. The secretion is released from each head cell into the subcuticular space through a lateral ostiole, and then onto the leaf surface via a central pore on each scale. This secretion mechanism is described in this study for the first time in family Combretaceae. Ultrastructural characteristics of scale cells display the typically active metabolism of secretory systems. Preliminary histochemical investigations show that these scales contain lipids, terpenoids, phenolics, flavonoids and alkaloids which probably offer anti-microbial and anti-herbivore protection.

Keywords

Combretum molle Histochemistry Leaf micromorphology Medicinal plant Secretion mechanism Ultrastructure Scales 

Notes

Acknowledgments

The authors gratefully acknowledge the National Research Foundation, South Africa for financial support. We are very grateful to Ms. Farisha Khan and Ms. Jennifer Richards, students of the School of Biological and Conservation Sciences, University of KwaZulu-Natal, for sharing their project on Combretum.

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  1. 1.School of Biological and Conservation Sciences KwaZulu-Natal UniversityDurbanSouth Africa
  2. 2.Botany Department, Faculty of ScienceSuez Canal UniversitySuezEgypt
  3. 3.Geography Programme, School of Distance Education Sains Malaysia UniversityMindenMalaysia

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