Development and Structure of the Root Cortex in Caltha palustris L. and Nymphaea odorata Ait

Structural features of the mature root cortex and its apoplastic permeability to dyes have been determined for two dicotyledonous wetland plants of differing habitats: Nymphaea odorata, growing rooted in water and mud, and Caltha palustris, growing in temporal wetlands among cattails. In mature root...

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Bibliographic Details
Published in:Annals of botany 2000-09, Vol.86 (3), p.631-640
Main Authors: Seago, James L., Peterson, Carol A., Kinsley, Laura J., Broderick, Jennifer
Format: Article
Language:English
Subjects:
aerenchyma
aquatic plants
Caltha palustris
Caltha palustris, Nymphaea odorata, root development, cortex, endodermis, aerenchyma, exodermis, hypodermis, permeability, wetland plants
cell division
Cell walls
cortex
Endodermis
exodermis
habitats
Hypodermis
Meristems
Nymphaea odorata
permeability
Physiology and Anatomy of Roots in Wetland Environments
plant anatomy
Plant cortex
plant development
Plant roots
Plants
root development
roots
species differences
Ultraviolet radiation
Wetland plants
Wetlands
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Summary:Structural features of the mature root cortex and its apoplastic permeability to dyes have been determined for two dicotyledonous wetland plants of differing habitats: Nymphaea odorata, growing rooted in water and mud, and Caltha palustris, growing in temporal wetlands among cattails. In mature roots, movement of the apoplastic dyes, berberine and safranin, into the roots was blocked at the hypodermis, indicating the presence of an exodermis. A hypodermis with an exodermis, i.e. Casparian bands in the outermost uniseriate layer plus suberin lamellae, is present in both species. In N. odorata, hypodermal walls are further modified with cellulosic secondary walls. Roots of N. odorata and C. palustris have an endodermis with Casparian bands only. A honeycomb aerenchyma is produced by differential expansion in N. odorata and includes astrosclereids and diaphragms, while roots of C. palustris have no aerenchyma, but some irregular lacunae are found in old roots. These aspects of cortex structure are related to an open meristem organization, with unusual patterns of cell divisions in certain ground meristem cells (called semi-regular hexagon cells) of N. odorata. The correlation between aerenchyma pattern and hypodermal structure appears to be related to habitat differences.
ISSN:0305-7364
1095-8290
DOI:10.1006/anbo.2000.1107