Abstract
Exposure of Zea mays seedlings to a continuous electromagnetic field (EMF) for 30 h induced a 30% stimulation in the rate of root elongation compared with the controls. It also resulted in a significant increase of cell expansion, in both the acropetal (metaxylem cell lineage) and basipetal (root cap cells) direction. In addition, in EMF-exposed roots a precocious structural disorder was observed both in differentiating metaxylem cells and root cap cells. All these features may be consistent with an advanced differentiation of root cells that are programmed to die. EMF treatment also resulted in a significant reduction in the size of the quiescent centre in the root apical meristem. The extent to which these responses are causally linked is discussed.
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