Suberin lamella development in maize seedling roots grown in aerated and stagnant conditions
Open Access
- 17 January 2005
- journal article
- Published by Wiley in Plant, Cell & Environment
- Vol. 28 (4) , 444-455
- https://doi.org/10.1111/j.1365-3040.2005.01286.x
Abstract
Hypoxia can stimulate the development of a suberized exodermis in aquatic plants; however, its influence on this aspect of terrestrial root development is sparsely documented. To determine the effects of hypoxia on maize (Zea mays cv. Seneca Horizon) roots, seedlings were grown in vermiculite (VERM), aerated hydroponics (AER), stagnant hydroponics with agar (STAG), or aerated hydroponics with agar (AERAG). The endo‐ and exodermis were examined for wall modifications. Lateral root emergence and aerenchyma formation were documented qualitatively. The endodermal Casparian band formation was unaffected by treatment. Endodermal and exodermal suberin lamella formation was earliest and most extensive in VERM. Suberization, especially in the exodermis of aerated treatments, was depressed in all hydroponic media. In comparison with AER, STAG exodermal lamellae were increased, but endodermal lamellae were decreased. Since the suberized exodermis forms a barrier to radial oxygen loss from roots to the medium, its stimulation in STAG roots (which also developed extensive aerenchyma) would help retain oxygen in the root. The reduction of endodermal lamellae should facilitate oxygen diffusion into the stele. Clearly, the response to environmental conditions is variable within individual cortical cell layers. Additionally, the observed patterns of lamellae, aerenchyma and lateral root development indicate a tight radial co‐ordination of root development.Keywords
This publication has 35 references indexed in Scilit:
- Differences in structure of adventitious roots in Salix clones with contrasting characteristics of cadmium accumulation and sensitivityPhysiologia Plantarum, 2004
- Long‐distance transport of gases in plants: a perspective on internal aeration and radial oxygen loss from rootsPlant, Cell & Environment, 2003
- Waterlogging tolerance in the tribe Triticeae: the adventitious roots ofCritesion marinumhave a relatively high porosity and a barrier to radial oxygen lossPlant, Cell & Environment, 2001
- Changes in growth, porosity, and radial oxygen loss from adventitious roots of selected mono‐ and dicotyledonous wetland species with contrasting types of aerenchymaPlant, Cell & Environment, 2000
- A comparison of NH4+ and NO3– net fluxes along roots of rice and maizePlant, Cell & Environment, 1998
- OXYGEN DEFICIENCY AND ROOT METABOLISM: Injury and Acclimation Under Hypoxia and AnoxiaAnnual Review of Plant Biology, 1997
- Lateral root initiation by asymmetrical transverse divisions of pericycle cells in four plant species:Raphanus sativus, Helianthus annuus, Zea mays, andDaucus carotaProtoplasma, 1995
- THE ANATOMICAL CHARACTERISTICS OF ROOTS AND PLANT RESPONSE TO SOIL FLOODINGNew Phytologist, 1987
- Formation of aerenchyma in roots of Zea mays in aerated solutions, and its relation to nutrient supplyPhysiologia Plantarum, 1980
- Radial Oxygen Losses from Intact Rice Roots as Affected by Distance from the Apex, Respiration and WaterloggingPhysiologia Plantarum, 1971