Rhizosphere processes do not explain variation in P acquisition from sparingly soluble forms among Lupinus albus accessions
Stuart J. Pearse A C , Erik J. Veneklaas A , Greg Cawthray A , Mike D. A. Bolland A B and Hans Lambers AA School of Plant Biology, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia.
B Department of Agriculture and Food Western Australia, PO Box 1231, Bunbury, WA 6231, Australia.
C Corresponding author. Email: spearse@graduate.uwa.edu.au
Australian Journal of Agricultural Research 59(7) 616-623 https://doi.org/10.1071/AR07404
Submitted: 25 October 2007 Accepted: 19 March 2008 Published: 3 July 2008
Abstract
Seven Lupinus albus L. landraces were selected, based on their geographic origin and the soil type and pH at the site of collection of the seeds, and compared with the cv. Kiev mutant. We hypothesised that those landraces collected from red/yellow acidic sands (pH 5–5.7) would be better at acquiring P from FePO4 or AlPO4 than those selected from brown neutral (pH 7) or fine, calcareous, alkaline sands (pH 9), and that those selected from fine calcareous sands would be more effective at acquiring P from Ca5OH(PO4)3. Plants were grown in sand and supplied with 40 mg P/kg as the above sparingly soluble forms, or as soluble KH2PO4; control plants received no P. All genotypes were able to use these P sources. Variation in using poorly soluble P was not due to differences in rhizosphere carboxylate concentration, cluster-root development, or rhizosphere-extract pH. L. albus landraces with a better ability to use P from different sparingly soluble forms could be exploited to develop cultivars that are more P-acquisition efficient on soils that are low in [P] or highly P-sorbing; however, desirable genotypes cannot simply be selected based on soil type of origin.
Additional keywords: carboxylates, cluster roots, pH, phosphate.
Acknowledgments
This research was part of an Australian Research Council (ARC) Strategic Partnerships with Industry – Research & Training (SPIRT) scheme funding a PhD project in collaboration with the Department of Agriculture and Food, Western Australia, and CSBP FutureFarm. Colin Smith from the Department of Agriculture and Food, Western Australia, provided the seeds and accession selection advice, for which we are very grateful. Thanks to Madeleine Wouterlood, Ben Croxford, Aleksander Moreno, and Jarrad King for assisting with the harvest. This manuscript was partially completed while funded by a Japan Society for the Promotion of Science (JSPS) Postdoctoral Award at the Japan International Research Center for Agricultural Sciences (JIRCAS).
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