Protoplasma

pp 1–10 | Cite as

Structure of the stigma and style of Callaeum psilophyllum (Malpighiaceae) and its relation with potential pollinators

  • Sandra Silvina Aliscioni
  • Marina Gotelli
  • Juan Pablo Torretta
Original Article

Abstract

The family Malpighiaceae, particularly in the Neotropic, shows a similar floral morphology. Although floral attraction and rewards to pollinators are alike, stigmas and styles show more diversity. The stigmas were described covered with a thin and impermeable cuticle that needs to be ruptured by the mechanical action of the pollinators. However, this characteristic was only mentioned for a few species and the anatomy and ultrastructure of the stigmas were not explored. In this work, we analyze the morphology, anatomy, and ultrastructure of the stigma and style of Callaeum psilophyllum. Moreover, we identify the potential pollinators in order to evaluate how the disposition of the stigmas is related with their size and its role in the exposure of the receptive stigmatic surface. Our observations indicate that Centris flavifrons, C. fuscata, C. tarsata, and C. trigonoides are probably efficient pollinators of C. psilophyllum. The three stigmas are covered by a cuticle that remained intact in bagged flowers. The flowers exposed to visitors show the cuticle broken, more secretion in the intercellular spaces between sub-stigmatic cells and abundant electron-dense components inside vacuoles in stigmatic papillae. This indicates that the stigmas prepares in similar ways to receive pollen grains, but the pollinator action is required to break the cuticle, and once pollen tubes start growing, stigmatic and sub-stigmatic cells release more secretion by a granulocrine process.

Keywords

Morphology Anatomy Ultrastructure Centris Cuticle 

Notes

Acknowledgements

We thank to G. Zarvlasky for technical assistance and the Dirección de Áreas Naturales Protegidas, Organismo Provincial para el Desarrollo Sostenible, of the Provincia de Buenos Aires (Multiple-uses Natural Reserve Martín García) for permissions to conduct this study.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

All applicable international, national, and/or institutional guidelines for the care and use of animals were followed. This article does not contain any studies with human participants performed by any of the authors.

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Copyright information

© Springer-Verlag GmbH Austria, part of Springer Nature 2018

Authors and Affiliations

  • Sandra Silvina Aliscioni
    • 1
    • 2
    • 3
  • Marina Gotelli
    • 2
    • 3
  • Juan Pablo Torretta
    • 2
    • 3
  1. 1.Instituto de Botánica Darwinion (IBODA)Buenos AiresArgentina
  2. 2.Universidad de Buenos Aires, Facultad de Agronomía, Cátedra de Botánica GeneralBuenos AiresArgentina
  3. 3.Consejo Nacional de Investigaciones Científicas y TécnicasBuenos AiresArgentina

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