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https://hdl.handle.net/2440/64423
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dc.contributor.author | Denton, M. | - |
dc.contributor.author | Sasse, C. | - |
dc.contributor.author | Tibbett, M. | - |
dc.contributor.author | Ryan, M. | - |
dc.date.issued | 2006 | - |
dc.identifier.citation | Functional Plant Biology: an international journal of plant function, 2006; 33(12):1091-1102 | - |
dc.identifier.issn | 1445-4408 | - |
dc.identifier.issn | 1445-4416 | - |
dc.identifier.uri | http://hdl.handle.net/2440/64423 | - |
dc.description.abstract | Many Australian plant species have specific root adaptations for growth in phosphorus-impoverished soils, and are often sensitive to high external P concentrations. The growth responses of native Australian legumes in agricultural soils with elevated P availability in the surface horizons are unknown. The aim of these experiments was to test the hypothesis that increased P concentration in surface soil would reduce root proliferation at depth in native legumes. The effect of P placement on root distribution was assessed for two Australian legumes, Kennedia prorepens F. Muell. and Lotus australis Andrews, and the exotic Medicago sativa L. Three treatments were established in a low-P loam soil: amendment of 0.15 g mono-calcium phosphate in either (i) the top 50 mm (120 µg P g–1) or (ii) the top 500 mm (12 µg P g⁻¹) of soil, and an unamended control. In the unamended soil M. sativa was shallow rooted, with 58% of the root length of in the top 50 mm. K. prorepens and L. australis had a more even distribution down the pot length, with only 4 and 22% of their roots in the 0–50 mm pot section, respectively. When exposed to amendment of P in the top 50 mm, root length in the top 50 mm increased 4-fold for K. prorepens and 10-fold for M. sativa, although the pattern of root distribution did not change for M. sativa. L. australis was relatively unresponsive to P additions and had an even distribution of roots down the pot. Shoot P concentrations differed according to species but not treatment (K. prorepens 2.1 mg g⁻¹, L. australis 2.4 mg gv, M. sativa 3.2 mg g⁻¹). Total shoot P content was higher for K. prorepens than for the other species in all treatments. In a second experiment, mono-ester phosphatases were analysed from 1-mm slices of soil collected directly adjacent to the rhizosphere. All species exuded phosphatases into the rhizosphere, but addition of P to soil reduced phosphatase activity only for K. prorepens. Overall, high P concentration in the surface soil altered root distribution, but did not reduce root proliferation at depth. Furthermore, the Australian herbaceous perennial legumes had root distributions that enhanced P acquisition from low-P soils. | - |
dc.description.statementofresponsibility | Matthew D. Denton, Camille Sasse, Mark Tibbett, Megan H. Ryan | - |
dc.language.iso | en | - |
dc.publisher | C S I R O Publishing | - |
dc.rights | © CSIRO 2006 | - |
dc.source.uri | http://dx.doi.org/10.1071/fp06176 | - |
dc.subject | alfalfa | - |
dc.subject | Kennedia prorepens | - |
dc.subject | Lotus australis | - |
dc.subject | lucerne | - |
dc.subject | Medicago sativa | - |
dc.subject | phosphatase. | - |
dc.title | Root distributions of Australian herbaceous perennial legumes in response to phosphorus placement | - |
dc.type | Journal article | - |
dc.identifier.doi | 10.1071/FP06176 | - |
pubs.publication-status | Published | - |
dc.identifier.orcid | Denton, M. [0000-0002-2804-0384] | - |
Appears in Collections: | Agriculture, Food and Wine publications Aurora harvest 5 |
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