Aluminium tolerance of root hairs underlies genotypic differences in rhizosheath size of wheat (Triticum aestivum) grown on acid soil
Article first published online: 29 MAY 2012
© 2012 The Authors. New Phytologist © 2012 New Phytologist Trust
Volume 195, Issue 3, pages 609–619, August 2012
How to Cite
Delhaize, E., James, R. A. and Ryan, P. R. (2012), Aluminium tolerance of root hairs underlies genotypic differences in rhizosheath size of wheat (Triticum aestivum) grown on acid soil. New Phytologist, 195: 609–619. doi: 10.1111/j.1469-8137.2012.04183.x
- Issue published online: 9 JUL 2012
- Article first published online: 29 MAY 2012
- Received: 23 March 2012, Accepted: 13 April 2012
- acid soil;
- aluminium resistance;
- aluminium tolerance;
- root hairs;
- •We found significant genetic variation in the ability of wheat (Triticum aestivum) to form rhizosheaths on acid soil and assessed whether differences in aluminium (Al3+) tolerance of root hairs between genotypes was the physiological basis for this genetic variation.
- •A method was developed to rapidly screen rhizosheath size in a range of wheat genotypes. Backcrossed populations were generated from cv Fronteira (large rhizosheath) using cv EGA-Burke (small rhizosheath) as the recurrent parent.
- •A positive correlation existed between rhizosheath size on acid soil and root hair length. In hydroponic experiments, root hairs of the backcrossed lines with large rhizosheaths were more tolerant of Al3+ toxicity than the backcrossed lines with small rhizosheaths.
- •We conclude that greater Al3+ tolerance of root hairs underlies the larger rhizosheath of wheat grown on acid soil. Tolerance of the root hairs to Al3+ was largely independent of the TaALMT1 gene which suggests that different genes encode the Al3+ tolerance of root hairs. The maintenance of longer root hairs in acid soils is important for the efficient uptake of water and nutrients.