Carboxylate composition of root exudates does not relate consistently to a crop species' ability to use phosphorus from aluminium, iron or calcium phosphate sources

被引:167
|
作者
Pearse, Stuart J.
Veneklaas, Erik J.
Cawthray, Greg
Bolland, Mike D. A.
Lambers, Hans
机构
[1] Univ Western Australia, Sch Plant Biol, Nedlands, WA 6009, Australia
[2] Dept Agr & Food Western Australia, Bunbury, WA 6231, Australia
关键词
canola; carboxylates; Lupinus; pH; phosphate; pulse; rhizosphere; wheat; ORGANIC ANION EXUDATION; LUPINUS-ALBUS L; ROCK PHOSPHATE; SINGLE ROOT; MALIC-ACID; RHIZOSPHERE; SOIL; WHEAT; SOLUBILIZATION; MOBILIZATION;
D O I
10.1111/j.1469-8137.2006.01897.x
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
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 AIPO(4), FePO4 or Ca5O(H)(PO4)(3), or as soluble KH2PO4; 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 AIPO(4) or FePO4 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.
引用
收藏
页码:181 / 190
页数:10
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