Root cortex: structural and functionla variability and responses to environmental stress

Lux, A and Luxova, M and Abe, J and Morita, S (2004) Root cortex: structural and functionla variability and responses to environmental stress. Root Research, 13 (3). pp. 117-131.

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The cortex is the basic part of the primary root body and represents an important constituent of the root, both structurally and functionally. In monocotyledons, it might persist during the entire life of the root. In dicotyledons, with limited secondary thickening it might persist for a long time and be subject to dilatation growth. In intensively secondary-thickening roots, the cortex gradually deteriorates and is replaced by secondary tissues-the periderm. The functions of cortical tissues are diverse. The endodermis, and to some extent the exodermis, represent apoplastic barriers that control the uptake and radial transport of water and solutes by the root. However, these layers have several additional functions such as mechanically protecting the stele and protection against pathogens and parasites. Although the mid-cortex (or mesodermis) is primarily the site for reserve material deposition it can also have several different functions that depend on the species and growth conditions. These include aeration in hypoxia (aerenchyma formation), and the location for symbiosis and even photosynthesis. The cortex varies widely amongst species and even in various root types of the same species. It might be designated as a root buffer zone, especially under stress conditions. Some aspects of the development, structure and function of cortical tissues are discussed in this report.

Item Type: Article
Additional Information: The work was partially supported by the Field Production Science Center, the University of Tokyo, grant 1/0100/03 from the Slovak Grant Agency VEGA and COST Action 859. We apologize to all colleagues whose works were not included due to the lack of space. The authors appreciate the generosity of the Keyence Company in allowing us to use their high sensitive CCD color camera to take some photos for this review.
Uncontrolled Keywords: cortex, endodermis, exodermis, hypodermis, mid-cortex
Author Affiliation: Dep. of Plant Physiology, Faculty of Natural Sciences, Comenius University in Bratislava, Slovak Republic
Subjects: Plant Protection
Divisions: General
Depositing User: Mr Siva Shankar
Date Deposited: 19 Apr 2012 05:14
Last Modified: 19 Apr 2012 05:14

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