Plant Physiol.
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Plant Physiology 65:506-511 (1980)
© 1980 American Society of Plant Biologists

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Articles

Cortical Air Spaces (Aerenchyma) in Roots of Corn Subjected to Oxygen Stress

STRUCTURE AND INFLUENCE ON UPTAKE AND TRANSLOCATION OF 86RUBIDIUM IONS

Malcolm C. Drew1,2, André Chamel, Jean-Paul Garrec3 and André Fourcy

Laboratoire de Biologie Végétale, Départment de Recherche Fondamentale, Centre d'Études Nucléaires 85X 38041 Grenoble, France

When the seminal root system of 14-day-old corn (Zea mays cv. Dekalb 202) was subjected to O2 stress, nodal roots with well developed cortical air spaces (aerenchyma) grew into the deoxygenated solution. Microscopic examination showed that there was extensive breakdown of cells in the midcortex of these roots, while the stele, endodermis, and inner layer of cortical cells remained complete, as did the outer layers of the cortex and the epidermis. Occasional files of intact cells, and the wall residues of collapsed cells, crossed the space between inner and outer cortex. Experiments with short, intact root segments with and without air spaces showed that in the presence of O2 the ability to absorb and translocate 86Rb+, per unit volume or length of root, was little affected by cortical degeneration. The distribution across root sections of recently supplied strontium and rubidium, determined by electron microprobe analysis, indicated that in roots with air spaces the strands of wall residues bridging the cortex could be involved in maintaining the conduction of ions from the outer cortex up to the endodermis.

1 Permanent address: Agricultural Research Council, Letcombe Laboratory, Wantage OX12 9JT England.

2 To whom requests for reprints should be addressed.

3 Centre National de la Recherche Scientifique.






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Copyright © 1980 by the American Society of Plant Biologists