Author： Pellet D.M. Papernik L.A. Jones D.L. Darrah P.R. Grunes D.L. Kochian L.V.
Publisher： Springer Publishing Company
ISSN： 0032-079X
Source： Plant and Soil, Vol.192, Iss.1, 1997-05, pp. : 63-68
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Abstract
The goal of this study was to determine if Al-chelators other than malate are released from root apices and are involved in Al-tolerance in different wheat (Triticum aestivum L.) genotypes. Also we wanted to establish if root exudates contribute to increases in rhizosphere pH around the root tip. In seedlings of Al-tolerant Atlas, we have documented a constitutive phosphate exudation from the root apex. Because phosphate can complex Al and bind protons, it could play an important role in Al tolerance, both via complexation of Al^3+ and by contributing to the alkalinization of rhizosphere pH observed at the apex of Atlas. This study suggests that in wheat, Al-tolerance can be mediated by multiple exclusion mechanisms controlled by different genes.
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