Identification of the primary lesion of toxic aluminum in plant roots

Kopittke, Peter M., Moore, Katie L., Lombi, Enzo, Gianoncelli, Alessandra, Ferguson, Brett J., Blamey, F. Pax C., Menzies, Neal W., Nicholson, Timothy M., McKenna, Brigid A., Wang, Peng, Gresshoff, Peter M., Kourousias, George, Webb, Richard I., Green, Kathryn and Tollenaere, Alina (2015) Identification of the primary lesion of toxic aluminum in plant roots. Plant Physiology, 167 4: 1402-1411. doi:10.1104/pp.114.253229


Author Kopittke, Peter M.
Moore, Katie L.
Lombi, Enzo
Gianoncelli, Alessandra
Ferguson, Brett J.
Blamey, F. Pax C.
Menzies, Neal W.
Nicholson, Timothy M.
McKenna, Brigid A.
Wang, Peng
Gresshoff, Peter M.
Kourousias, George
Webb, Richard I.
Green, Kathryn
Tollenaere, Alina
Title Identification of the primary lesion of toxic aluminum in plant roots
Journal name Plant Physiology   Check publisher's open access policy
ISSN 1532-2548
0032-0889
Publication date 2015-04
Year available 2015
Sub-type Article (original research)
DOI 10.1104/pp.114.253229
Open Access Status DOI
Volume 167
Issue 4
Start page 1402
End page 1411
Total pages 10
Place of publication Rockville, MD United States
Publisher American Society of Plant Biologists
Collection year 2016
Language eng
Abstract Despite the rhizotoxicity of aluminum (Al) being identified over 100 years ago, there is still no consensus regarding the mechanisms whereby root elongation rate is initially reduced in the approximately 40% of arable soils worldwide that are acidic. We used high-resolution kinematic analyses, molecular biology, rheology, and advanced imaging techniques to examine soybean (Glycine max) roots exposed to Al. Using this multidisciplinary approach, we have conclusively shown that the primary lesion of Al is apoplastic. In particular, it was found that 75 µm Al reduced root growth after only 5 min (or 30 min at 30 µm Al), with Al being toxic by binding to the walls of outer cells, which directly inhibited their loosening in the elongation zone. An alteration in the biosynthesis and distribution of ethylene and auxin was a second, slower effect, causing both a transient decrease in the rate of cell elongation after 1.5 h but also a longer term gradual reduction in the length of the elongation zone. These findings show the importance of focusing on traits related to cell wall composition as well as mechanisms involved in wall loosening to overcome the deleterious effects of soluble Al.
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

 
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Created: Tue, 17 Mar 2015, 11:01:34 EST by Dr Brett Ferguson on behalf of Centre for Integrative Legume Research