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C M Sosa1, A M Gonzalez2,3

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Summary

Colleters, secretory structures in Myrtaceae, were analyzed in five species. Conical and euriform types were identified, secreting lipids, mucilage, phenolics, and proteins, offering taxonomic insights.

Keywords:
Conical colleterEuriform colleterHistochemistryMyrtoideae

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Area of Science:

  • Botany
  • Plant Anatomy
  • Secretory Structures

Background:

  • Colleters are secretory structures found in over 60 plant families, with three types (petaloid, conical, euriform) previously identified in Myrtaceae.
  • Myrtaceae species in Argentina inhabit diverse regions, from subtropical areas to Patagonia's temperate rainforests.

Purpose of the Study:

  • To investigate the presence, morphology, and secretion products of colleters in five species of the subfamily Myrtoideae, tribe Myrtea.
  • To analyze colleters in vegetative buds of species native to Patagonia and Corrientes, Argentina.

Main Methods:

  • Optical and scanning electron microscopy were employed to identify colleters in vegetative organs.
  • Histochemical tests were conducted to determine the main secretion products of these structures.

Main Results:

  • Colleters were found on leaf primordia, cataphylls, and petioles, replacing stipules.
  • Homogeneous colleters, lacking vascularization and originating from the protodermis, were observed.
  • Conical colleters were identified in Luma apiculata, Myrcianthes pungens, and Eugenia moraviana; euriform colleters in Amomyrtus luma and Myrceugenia exsucca.
  • Secretions included lipids, mucilage, phenolic compounds, and proteins.

Conclusions:

  • This study provides the first description of colleters in the analyzed Myrtaceae species.
  • The morphological types and secretion products of colleters hold potential taxonomic and phylogenetic significance within the Myrtaceae family.