Morphology, ultrastructure, and function of extrafloral nectaries in three species of Caesalpiniacae

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Publication Type Journal Article
School or College College of Humanities
Department Philosophy
Creator Haber, Matthew
Other Author Durkee, Lenore T; Dorn, Lisa; Remington, Ann
Title Morphology, ultrastructure, and function of extrafloral nectaries in three species of Caesalpiniacae
Date 1999
Description Light and electron microscopy reveal that the morphologically well-differentiated petiolar nectaries of Ckamaecrista fasciculata, Senna hepecarpa, and S. marilandica have an unusually simple anatomy consisting of an epidermis immediately subtended by a mass of small, loosely-packed parenchyma cells. Vascular strands from the petiolar bundles enter the nectary and terminate as phloem within or near this parenchyma. In mature, secreting nectaries, the cuticle of the epidermis extends between the epidermal cells and into the nectary parenchyma, where it occupies, but does not occlude, much of the free space of this tissue. The cutin is not found below the level of the phloem endings and it is not found in very young nectaries, but begins to appear when cell expansion occurs. These observations, together with the proximity of phloem to the parenchyma free space and the almost exclusive presence of sucrose in the nectar suggest that, although symplastic transport of sugars may occur, an alternate pathway for secretion is possible whereby sugar diffuses from the phloem, moves through the nectary to the surface without being acted upon by cells in transit, and is released by rupture of the external cuticle and the concomitant activity of foraging ants and other nectar feeders.
Type Text
Publisher Iowa Academy of Science
Volume 106
Issue 4
First Page 82
Last Page 88
Subject Extrafloral nectaries; Morphology; Ultrastructure; Function; Cutin; Phloem; Parenchyma; Chamaecrista fascicu; Senna hepecarpa; Senna marilandic
Subject LCSH Nectaries; Caesalpiniacae; Nectar; Plant physiology
Language eng
Bibliographic Citation Durkee, L. T., Haber, M. H., Dorn, L., & Remington, A. (1999). Morphology, ultrastructure, and function of extrafloral nectaries in three species of Caesalpiniacae. Journal of the Iowa Academy of Science, 106(4), 82-8.
Rights Management (c)Iowa Academy of Science
Format Medium application/pdf
Format Extent 3,661,566 bytes
Identifier ir-main,2475
ARK ark:/87278/s6np2ng6
Setname ir_uspace
Date Created 2012-06-13
Date Modified 2021-05-06
ID 702424
Reference URL https://collections.lib.utah.edu/ark:/87278/s6np2ng6
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