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GrainGenes Reference Report: PPS-103-685

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Reference	PPS-103-685
Title	Aluminim tolerance in wheat ( Triticum aestivum L.) 1. Uptake and distribution of aluminum in root species.
Journal	Plant Physiology
Year	1993
Volume	103
Pages	685-693
Author	[ Hide all but 1 of 6 ] Delhaize E Craig S Beaton CD Bennet RJ Jagadish VC Randall PJ
Abstract	We investigated the uptake and distribution of Al in root apices of near-isogenic wheat (Triticum aestivum L.) lines differing in Al tolerance at a single locus (Alt1: aluminum tolerance). Seedlings were grown in nutrient solution that contained 100 [mu]M Al, and the roots were subsequently stained with hematoxylin, a compound that binds Al in vitro to form a colored complex. Root apices of Al-sensitive genotypes stained after short exposures to Al (10 min and 1 h), whereas apices of Al-tolerant seedlings showed less intense staining after equivalent exposures. Differential staining preceded differences observed in either root elongation or total Al concentrations of root apices (terminal 2-3 mm of root). After 4 h of exposure to 100 [mu]M Al in nutrient solution, Al-sensitive genotypes accumulated more total Al in root apices than Al-tolerant genotypes, and the differences became more marked with time. Analysis of freeze-dried root apices by x-ray microanalysis showed that Al entered root apices of Al-sensitive plants and accumulated in the epidermal layer and in the cortical layer immediately below the epidermis. Long-term exposure of sensitive apices to Al (24 h) resulted in a distribution of Al coinciding with the absence of K. Quantitation of Al in the cortical layer showed that sensitive apices accumulated 5- to 10-fold more Al than tolerant apices exposed to Al solutions for equivalent times. These data are consistent with the hypothesis that Alt1 encodes a mechanism that excludes Al from root apices.
External Databases	https://doi.org/10.1104/pp.103.3.685
Gene	alt1 (Triticum) Alt1 (Triticum)
Germplasm	ES3 ET3

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