Spatial coordination of aluminium uptake, production of reactive oxygen species, callose production and wall rigidification in maize roots
Open Access
- 28 April 2006
- journal article
- Published by Wiley in Plant, Cell & Environment
- Vol. 29 (7) , 1309-1318
- https://doi.org/10.1111/j.1365-3040.2006.01509.x
Abstract
Aluminium (Al) toxicity associated with acid soils represents one of the biggest limitations to crop production worldwide. Although Al specifically inhibits the elongation of root cells, the exact mechanism by which this growth reduction occurs remains controversial. The aim of this study was to investigate the spatial and temporal dynamics of Al migration into roots of maize (Zea mays L.) and the production of the stress response compound callose. Using the Al‐specific fluorescent probe morin, we demonstrate the gradual penetration of Al into roots. Al readily accumulates in the root’s epidermal and outer cortical cell layers but does not readily penetrate into the inner cortex. After prolonged exposure times (12–24 h), Al had entered all areas of the root apex. The spatial and temporal accumulation of Al within the root is similarly matched by the production of the cell wall polymer callose, which is also highly localized to the epidermis and outer cortical region. Exposure to Al induced the rapid production of reactive oxygen species and induced a significant rigidification of the cell wall. Our results suggest that Al‐induced root inhibition in maize occurs by rigidification of the epidermal layers.Keywords
This publication has 45 references indexed in Scilit:
- A role for pectin in the control of cell expansionSoil Science and Plant Nutrition, 2003
- Role of dynamics of intracellular calcium in aluminium‐toxicity syndromeNew Phytologist, 2003
- Aluminum-induced oxidative stress in maizePhytochemistry, 2003
- The systemic movement of a tobamovirus is inhibited by a cadmium-ion-induced glycine-rich proteinNature Cell Biology, 2002
- A comparison of the kinetics of aluminum (Al) uptake and distribution in roots of wheat (Triticum aestivum) using different aluminum sources. A revision of the operational definition of symplastic AlPhysiologia Plantarum, 1996
- Aluminum Inhibition of the Inositol 1,4,5-Trisphosphate Signal Transduction Pathway in Wheat Roots: A Role in Aluminum Toxicity?Plant Cell, 1995
- Aluminum Inhibition of the Inositol 1,4,5-Trisphosphate Signal Transduction Pathway in Wheat Roots: A Role in Aluminum Toxicity?Plant Cell, 1995
- Cellular Mechanisms of Aluminum Toxicity and Resistance in PlantsAnnual Review of Plant Biology, 1995
- Gibberellic Acid Stimulation of Cucumber Hypocotyl ElongationPlant Physiology, 1989
- Chitosan-Elicited Callose Synthesis in Soybean Cells as a Ca2+-Dependent ProcessPlant Physiology, 1985