AI Article Synopsis
- The root cap and root border cells in plants produce mucilage that can bind aluminum ions, playing a potential role in aluminum resistance.
- Two soybean cultivars with different levels of aluminum resistance were studied to see how aluminum affected mucilage secretion and root growth.
- The study found that higher aluminum concentrations increased mucilage excretion and decreased root growth, but the more resistant cultivar showed better performance by immobilizing and detoxifying aluminum through mucilage.
Article Abstract
The root cap and root border cells (RBCs) of most plant species produced pectinaceous mucilage, which can bind metal cations. In order to evaluate the potential role of root mucilage on aluminum (Al) resistance, two soybean cultivars differing in Al resistance were aeroponic cultured, the effects of Al on root mucilage secretion, root growth, contents of mucilage-bound Al and root tip Al, and the capability of mucilage to bind Al were investigated. Increasing Al concentration and exposure time significantly enhanced mucilage excretion from both root caps and RBCs, decreased RBCs viability and relative root elongation except roots exposed to 400 μM Al for 48 h in Al-resistant cultivar. Removal of root mucilage from root tips resulted in a more severe inhibition of root elongation. Of the total Al accumulated in root, mucilage accounted 48-72 and 12-27 %, while root tip accounted 22-52 and 73-88 % in Al-resistant and Al-sensitive cultivars, respectively. A (27)Al nuclear magnetic resonance spectrum of the Al-adsorbed mucilage showed Al tightly bound to mucilage. Higher capacity to exclude Al in Al-resistant soybean cultivar is related to the immobilization and detoxification of Al by the mucilage secreted from root cap and RBCs.
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| http://dx.doi.org/10.1007/s11356-013-1815-6 | DOI Listing |
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