Flower and fruit structure of the endangered species Petagnaea gussonei (Sprengel) Rauschert (Saniculoideae,Apiaceae) and implications for its reproductive biology |
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Authors: | O. De Castro P. Colombo L. Gianguzzi R. Perrone |
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Affiliation: | 1. Dip Biologia, Università degli Studi di Napoli Federico II, Via Foria 223 – Orto Botanico, I-80139 Napoli, Italyodecastr@unina.it olga.decastro@unina.it;3. Dip Scienze della Terra e del Mare (DiSTeM), Università degli Studi di Palermo, Viale delle Scienze, Ed. 16, I-90128 Palermo, Italy;4. Dip Scienze Agrarie e Forestali, Università degli Studi di Palermo, Viale delle Scienze, Ed. 4, I-90128 Palermo, Italy |
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Abstract: | Petagnaea gussonei (Apiaceae) is an endangered species endemic to the Nebrodi mountains (north-eastern Sicily). Although an increasing number of studies have been performed on this species, its reproductive biology remains poorly understood. The aim of this study was to investigate in detail the structure of the flower and the fruit of Petagnaea, and the possible implications for its breeding system and seed dispersal mechanism. Results from fieldwork, light microscopy and scanning electron microscopy suggest (1) the presence of protandrous hermaphrodite flowers; (2) geitonogamy, autogamy, and allogamy as breeding system mechanisms of P. gussonei, even if asexual reproduction is preferred by the plant; and (3) epizoochory and hydrochory as possible modalities of fruit dispersal. |
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Keywords: | Anatomy breeding system flower fruit micromorphology endemic Petagnaea gussonei seed dispersal Sicily |
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