Abstract Detail

Anatomy and Morphology

L. Cunha Neto, Israel [1], A. Douglas, Norman [2], Angyalossy, Veronica [1].

First report on the structure and histochemistry of the “sticky rings” in stems of Anulocaulis (Nyctaginaceae).

Anulocaulis, commonly known as “ringstem”, is a small, unusual genus restricted to the the Chihuahuan, Sonoran, and Mojave deserts of North America. Here we combined light microscopy and histochemical tests to characterize the ‘sticky structures’ (here called secretory rings) found in the stem internodes of Anulocaulis for the first time. The secretory rings were shown to be groups of epidermal cells which largely differ from their neighboring cells both in structure and histochemistry. The cells start to differentiate in early stages of stem development. They begin as regular epidermal cells but later their anticlinal and external tangential walls start to enlarge. At maturity the cells become remarkably elongated, even balloon-like, with dense cytoplasmic content. Although the secretory rings have been reported as “mucilaginous structures” based on morphological observations, preliminary histochemical analyses showed that its exudate is complex, including a mixture of mucilage, proteins and phenolic compounds. Future investigations are needed to comparatively study the anatomy of the secretory rings within related genera of Nyctaginaceae and characterize the chemical components of their exudate more specifically to search for potential homologies and adaptive functions of these structures.

1 - University of São Paulo, 277 Matao st., Instituto de Biociências, São Paulo, SP, 05508-090, Brazil
2 - University of Florida, P.O. Box 118525, Gainesville, FL, 32611, Estados Unidos

secretory structure
Chihuahuan Desert

Presentation Type: Poster This poster will be presented at 5:30 pm. The Poster Session runs from 5:30 pm to 7:00 pm. Posters with odd poster numbers are presented at 5:30 pm, and posters with even poster numbers are presented at 6:15 pm.
Number: PAM007
Abstract ID:607
Candidate for Awards:Developmental and Structural Section best poster

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