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Anatomical and developmental studies on floral nectaries in Cardiospermum species: an approach to the evolutionary trend in Paullinieae

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Abstract

Floral nectaries are a widespread trait in the Sapindaceae. However, until now only a few data on nectaries and their evolutionary shifts are available for most taxa. This research focuses on the anatomy and development of floral nectaries in two endemic species, Cardiospermum heringeri and C. integerrimum. The nectary consists of two horn-like lobes, located at the base of the androgynophore. Anatomically, it is characterized by three components: uniseriate epidermis, sub-epidermal secretory tissue and vascular tissue. The epidermis contains many nectarostomata involved in the exudation process. The secretory parenchyma is composed of small thin-walled cells, relatively lightly stained, and idioblasts containing oxalate druses. Vascular tissue supplying the nectary consists exclusively of phloem. From an early stage of development, the nectary lobes in both species are associated with the base of the posterior petals, but each organ originates independently of one another. These results plus additional morphological observations of nectary lobes in some species of Cardiospermum, Serjania, Paullinia and Urvillea were analyzed within the framework of phylogenetic knowledge.

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Acknowledgments

We are indebted to Juan Pablo Coulleri for his assistance in character mapping. Financial support for our research was provided by the Agencia Nacional de Promoción Científica y Tecnológica (ANPCyT) and the Consejo Nacional de Investigaciones Científicas y Tecnológicas (CONICET), Argentina.

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  1. Instituto de Botánica del Nordeste, Consejo Nacional de Investigaciones Científicas y Técnicas, Universidad Nacional del Nordeste (UNNE-CONICET), 3400, Corrientes, Argentina

    Lucía Melisa Zini, Stella Maris Solís & María Silvia Ferrucci

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  1. Lucía Melisa Zini
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  2. Stella Maris Solís
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  3. María Silvia Ferrucci
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Correspondence to Lucía Melisa Zini.

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Zini, L.M., Solís, S.M. & Ferrucci, M.S. Anatomical and developmental studies on floral nectaries in Cardiospermum species: an approach to the evolutionary trend in Paullinieae. Plant Syst Evol 300, 1515–1523 (2014). https://doi.org/10.1007/s00606-013-0978-4

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