Abstract
The short-term influence (5-180 min) of 50 μM Al on cell division was investigated in root tips of two Zea mays L. varieties differing in Al-resistance. The incorporation of bromodeoxyuridine into S-phase nuclei was visualized by immunofluorescence staining using confocal laser fluorescence microscopy. In Al-sensitive plants 5 min Al exposure was enough to inhibit cell division in the proximal meristem (250-800 μm from the tip). After 10 or 30 min with Al only, a few S-phase nuclei were found in the cortical initials. By contrast, cell division was stimulated in the distal elongation zone (2.5-3.1 mm). After 180 min the protrusion of an incipient lateral root was observed in this zone. These observations suggest a fast change in cell patterning rather than a general cariotoxic effect after exposure to Al for a short time. No such changes were found in Al-resistant maize. This is the first report showing such fast Al-induced alterations in the number and the position of dividing cells in root tips. The observation that similar changes were induced by a local supply of naphthylphthalamic acid to the distal transition zone suggests that inhibition of auxin transport plays a role in the Al-induced alteration of root cell patterning. © The Author [2005]. Published by Oxford University Press. All rights reserved.
Original language | English |
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Pages (from-to) | 1213-1220 |
Journal | Journal of Experimental Botany |
Volume | 56 |
DOIs | |
Publication status | Published - 1 Apr 2005 |
Keywords
- Aluminium toxicity
- Auxin
- Cell division
- Naphthylphthalamic acid
- Root development
- Zea mays L.