Comparative floral spur anatomy and nectar secretion in four representatives of Ranunculaceae

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• 作者：Sebastian Antoń ; Magdalena Kamińska
• 关键词：Cell ultrastructure ; Cuticle micro ; channels ; Holocrine secretion ; Nectary structure ; Morphology and anatomy ; Secretory structures
• 刊名：Protoplasma
• 出版年：2015
• 出版时间：November 2015
• 年：2015
• 卷：252
• 期：6
• 页码：1587-1601
• 全文大小：4,719 KB
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  Martin JT, Juni
• 作者单位：Sebastian Antoń (1)
  Magdalena Kamińska (1)
  
  1. Department of Botany, University of Life Sciences in Lublin, Akademicka 15, 20-950, Lublin, Poland
  
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Cell Biology
  Plant Sciences
  Zoology
  
• 出版者：Springer Wien
• ISSN：1615-6102

文摘

Nectaries are common in Ranunculaceae. These secretory structures, however, have not been studied in detail despite their importance in plant-animal interactions, and data relating to the structure of nectary spurs, which are so characteristic of several genera of this family, remain scarce. In order to redress this imbalance, we sought, in the present paper, to analyze the anatomical and ultrastructural organization of the nectary spurs of four representatives of Ranunculaceae, i.e., Aconitum lycoctonum L., Aquilegia vulgaris L., Consolida regalis Gray, and Delphinium elatum L. Nectary spurs were examined using light, fluorescence, scanning electron, and transmission electron microscopy. The floral nectaries of A. lycoctonum and A. vulgaris are situated at the apices of the spurs, whereas in C. regalis and D. elatum, the nectary is located along the floor surface of the spurs. Nectar in C. regalis and D. elatum is exuded through micro-channels in the cuticle, whereas in A. lycoctonum and A. vulgaris, it is released by means of cell wall disruption, indicating that the method of nectar secretion here is holocrine. Structurally, the nectary of all four investigated species is quite similar, and its cells are typical of nectar-producing cells described in the literature. It is proposed that in A. lycoctonum and A. vulgaris, disruption of the cell wall and the release of the entire cell contents into the spur cavity contribute to the composition of the nectar that the latter contains, enriching it with cytoplasmic components. We conclude that the manner of nectar exudation may vary considerably between closely related plant species, regardless of their geographical origin and phylogeny. Keywords Cell ultrastructure Cuticle micro-channels Holocrine secretion Nectary structure Morphology and anatomy Secretory structures