Premium
Carboxylate composition of root exudates does not relate consistently to a crop species’ ability to use phosphorus from aluminium, iron or calcium phosphate sources
Author(s) -
Pearse Stuart J.,
Veneklaas Erik J.,
Cawthray Greg,
Bolland Mike D. A.,
Lambers Hans
Publication year - 2007
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.1469-8137.2006.01897.x
Subject(s) - rhizosphere , sativum , pisum , lupinus , phosphorus , lupinus angustifolius , biology , botany , phosphate , brassica , calcium , exudate , agronomy , chemistry , biochemistry , bacteria , genetics , organic chemistry
Summary• The relationship between carboxylate release from roots and the ability of the species to utilize phosphorus from sparingly soluble forms was studied by comparing Triticum aestivum , Brassica napus , Cicer arietinum , Pisum sativum , Lupinus albus , Lupinus angustifolius and Lupinus cosentinii . • Plants were grown in sand and supplied with 40 mg P kg −1 in the sparingly soluble forms AlPO 4 , FePO 4 or Ca 5 OH(PO 4 ) 3 , or as soluble KH 2 PO 4 ; control plants received no P. • The ability to utilize sparingly soluble forms of P differed between forms of P supplied and species. Pisum sativum and C . arietinum did not access AlPO 4 or FePO 4 despite releasing carboxylates into the rhizosphere. • Species accessed different forms of sparingly soluble P, but no species was superior in accessing all forms. We conclude that a single trait cannot explain access to different forms of sparingly soluble P, and hypothesize that in addition to carboxylates, rhizosphere pH and root morphology are key factors.