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Triticum aestivum shows a greater biomass response to a supply of aluminium phosphate than Lupinus albus , despite releasing fewer carboxylates into the rhizosphere
Author(s) -
Pearse Stuart J.,
Veneklaas Erik J.,
Cawthray Greg,
Bolland Mike D. A.,
Lambers Hans
Publication year - 2006
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.2005.01614.x
Subject(s) - lupinus , rhizosphere , phosphate , biology , biomass (ecology) , agronomy , phosphorus , nutrient , poaceae , botany , chemistry , bacteria , biochemistry , ecology , genetics , organic chemistry
Summary• The relationship between carboxylate release and the ability of plants to access phosphorus from AlPO 4 and to detoxify aluminium was studied by comparing species with a low and high rate of carboxylate release, Triticum aestivum (wheat) and Lupinus albus (white lupin), respectively. • Species were supplied with P at 10, 20, 40 or 100 mg P kg −1 sand in the form of sparingly soluble AlPO 4 or soluble KH 2 PO 4 ; control plants did not receive any P. • Triticum aestivum was significantly better than L . albus at accessing P from AlPO 4 , despite accumulating fewer carboxylates in its rhizosphere. Rhizosphere pH of L . albus did not vary with form or level of P supply, while the rhizosphere pH of T . aestivum increased with the level of P supplied. • Based on the evidence in the present study, a model is proposed to explain the poor performance of L . albus , whereby the release of carboxylates and associated protons reduces the chelating ability of exuded carboxylates, thus reducing P acquisition and increasing Al toxicity.