Pollination ecology and floral scent chemistry of Philodendron fragrantissimum (Araceae)

ABSTRACT

In French Guiana, Philodendron fragrantissimum (Hook.) G.Don was specifically pollinated by a single species of night-active cyclocephaline scarab, Cyclocephala simulatrix Höhne. Its inflorescences exhibited short-lasting anthesis (~30 h) and characteristic floral traits such as floral thermogenesis, edible/nutritious floral tissues, and profuse floral scent emission. Our insect exclusion experiments indicate that entomophilous cross-pollination is obligatory for P. fragrantissimum, with olfactory signalling playing a pivotal role in pollinator attraction. Three volatile organic compounds – methyl benzoate, (Z)-jasmone, and dehydrojasmone – dominate the floral scent of pistillate phase inflorescences (84–99%), but their relative proportions were different according to the headspace sampling method used, dynamic or static. Local pollination services provided by both female and male C. simulatrix are effective, as evidenced by a high visitation rate (>70%) that resulted in 55% of the inflorescences maturing into infructescences. Moreover, pollination was highly efficient, since 2–3 beetles sufficed to pollinate an average 94% of the pistillate flowers.

KEYWORDS:

• Cyclocephala
• thermogenesis
• reproductive success
• volatile organic compounds
• headspace sampling

Acknowledgments

We thank Aurélia Leguet for help in the field.

Disclosure statement

No potential conflict of interest was reported by the authors

Correction Statement

This article has been republished with minor changes. These changes do not impact the academic content of the article

Additional information

Notes on contributors

Marc Gibernau

Marc Gibernau study conception, field observations, and manuscript writing.

Artur Campos D. Maia

Artur Campos D. Maia field observations, chemical analyses, and manuscript writing.