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

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. integ...

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Bibliographic Details
Published in:Plant systematics and evolution 2014-06, Vol.300 (6), p.1515-1523
Main Authors: Zini, Lucía Melisa, Solís, Stella Maris, Ferrucci, María Silvia
Format: Article
Language:English
Subjects:
Anatomy
Biological evolution
Biological taxonomies
Biomedical and Life Sciences
Calyx
Cardiospermum
corolla
Developmental stages
Endemic species
Epidermis
Evolution
Extrafloral nectaries
Exudation
flowering
indigenous species
Life Sciences
Lobes
Nectaries
Ontogeny
Original Article
Oxalic acid
Parenchyma
Paullinia
Petals
Phloem
Phylogeny
Plant Anatomy/Development
Plant Ecology
Plant Sciences
Plant Systematics/Taxonomy/Biogeography
Plant tissues
Vascular tissue
Vascular tissues
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Summary: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.
ISSN:0378-2697
1615-6110
2199-6881
DOI:10.1007/s00606-013-0978-4