Studies on floral nectary, tepals-structure, and gynostemium morphology of Epipactis palustris (L.) Crantz (Orchidaceae)
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- 作者：Agnieszka K. Kowalkowska ; Joanna Kostelecka ; Jerzy Bohdanowicz…
- 关键词：Epipactis palustris ; Floral nectar ; Self ; pollination ; SEM ; TEM ; Orchidaceae
- 刊名：Protoplasma
- 出版年：2015
- 出版时间：January 2015
- 年：2015
- 卷：252
- 期：1
- 页码：321-333
- 全文大小：10,841 KB
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Joanna Kostelecka (1)
Jerzy Bohdanowicz (1)
Ma?gorzata Kapusta (1)
Joanna Rojek (1)
1. Department of Plant Cytology and Embryology, University of Gdańsk, Wita Stwosza 59, 80-308, Gdańsk, 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
The lip of Epipactis palustris consists of two movably joined parts: the basal part (hypochile) with central broad isthmus and epichile with callus. The analysis of flowers provides strong evidence to conclude that the whole surface of lip callus and abaxial side of isthmus are secretory. The exudation at first appears on callus, at early stages, later on isthmus. It could be a strategy to prolong the emission of volatile substances and nectar, and this means to prolong luring pollinators. The results from transmission electron microscopy (TEM) support this conclusion. The plastids noted in callus were without starch, whereas the isthmus-cells contained partly hydrolyzed starch. Some plastids, noted in callus, had polymorphic shapes, which were often related to a starch reduction. During the depletion of starch in callus cells, the number of plastoglobuli within the plastids increased, and also lipid bodies appeared in the cytoplasm whereas, in isthmus cells, proplastids with phytoferritin were noted. The endoplasmic reticulum was in contact with plasmalemma, and the vesicles were fusing with plasmalemma in secretory cells of callus and isthmus, which is a way of granulocrine secretion. The cross-sections of sepals revealed that abaxial epidermis was tomentose, with stomata at the top of substomatal cavities. The pollen grains adhering to the rostellum-viscidium prove previous ecological observations that the rostellum-viscidium is not a barrier preventing self-pollination.