Triticum aestivum shows a greater biomass response to a supply of aluminium phosphate than Lupinus albus, despite releasing fewer carboxylates into the rhizosphere

• DOI: 10.1111/j.1469-8137.2005.01614.x
• Publication Date: 2006-01-10T16:24:43Z
• Authors: Stuart J. Pearse; Erik J. Veneklaas; Greg Cawthray; Mike D. A. Bolland; Hans Lambers
• Keywords: Lupinus

• The relationship between carboxylate release and the ability of plants to access phosphorus from AlPO4 detoxify aluminium was studied by comparing species with a low high rate release, Triticum aestivum (wheat) Lupinus albus (white lupin), respectively. Species were supplied P at 10, 20, 40 or 100 mg kg−1 sand in form sparingly soluble KH2PO4; control did not receive any P. significantly better than L. accessing AlPO4, despite accumulating fewer carboxylates its rhizosphere. Rhizosphere pH vary level supply, while rhizosphere T. increased supplied. Based on evidence present study, model is proposed explain poor performance albus, whereby associated protons reduces chelating exuded carboxylates, thus reducing acquisition increasing Al toxicity.