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

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• 作者：Lucía Melisa Zini (1)
  Stella Maris Solís (1)
  María Silvia Ferrucci (1)
  
• 关键词：Floral nectary ; Nectary structure ; Nectary ontogeny ; Paullinieae ; Cardiospermum ; Character evolution
• 刊名：Plant Systematics and Evolution
• 出版年：2014
• 出版时间：June 2014
• 年：2014
• 卷：300
• 期：6
• 页码：1515-1523
• 全文大小：
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• 作者单位：Lucía Melisa Zini (1)
  Stella Maris Solís (1)
  María Silvia Ferrucci (1)
  
  1. Instituto de Botánica del Nordeste, Consejo Nacional de Investigaciones Científicas y Técnicas, Universidad Nacional del Nordeste (UNNE-CONICET), 3400, Corrientes, Argentina
  
• ISSN：1615-6110

文摘

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.