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https://hdl.handle.net/2440/128545
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Type: | Journal article |
Title: | Xylomelum occidentale (Proteaceae) accesses relatively mobile soil organic phosphorus without releasing carboxylates |
Author: | Zhong, H. Zhou, J. Azmi, A. Arruda, A.J. Doolette, A.L. Smernik, R.J. Lambers, H. |
Citation: | Journal of Ecology, 2021; 109(1):246-259 |
Publisher: | British Ecological Society; Wiley |
Issue Date: | 2021 |
ISSN: | 0022-0477 1365-2745 |
Editor: | Gibson, D. |
Statement of Responsibility: | Hongtao Zhong, Jun Zhou, Azrul Azmi, André J. Arruda, Ashlea L. Doolette, Ronald J. Smernik, Hans Lambers |
Abstract: | 1. Hundreds of Proteaceae species in Australia and South Africa typically grow on phosphorus (P)-impoverished soils, exhibiting a carboxylate-releasing P-mobilizing strategy. In the Southwest Australian Biodiversity Hotspot, two Xylomelum (Proteaceae) species are widely distributed, but restricted within that distribution. 2. We grew Xylomelum occidentale in hydroponics at 1 μM P. Leaves, seeds, rhizosheath and bulk soil were collected in natural habitats. 3. Xylomelum occidentale did not produce functional cluster roots and occupied soils that are somewhat less P-impoverished than those in typical Proteaceae habitats in the region. Based on measurements of foliar manganese concentrations (a proxy for rhizosphere carboxylate concentrations) and P fractions in bulk and rhizosheath soil, we conclude that X. occidentale accesses organic P, without releasing carboxylates. Solution 31P-NMR spectroscopy revealed which organic P forms X. occidentale accessed. 4. Xylomelum occidentale uses a strategy that differs fundamentally from that t ypical in Proteaceae, accessing soil organic P without carboxylates. We surmise that this novel strategy is likely expressed also in co-occurring non-Proteaceae that lack a carboxylate- exuding strategy. These co-occurring species are unlikely to benefit from mycorrhizal associations, because plant-available soil P concentrations are too low. 5. Synthesis. Our findings show the first field evidence of effectively utilizing soil organic P by X. occidentale without carboxylate exudation and explain their relatively restricted distribution in an old P-impoverished landscape, contributing to a better understanding of how diverse P-acquisition strategies coexist in a megadiverse ecosystem. |
Keywords: | Carboxylates; ecophysiology; manganese; phosphatases; Proteaceae; soil organic P; solution ³¹P-NMR; Xylomelum |
Rights: | 2020 British Ecological Society |
DOI: | 10.1111/1365-2745.13468 |
Grant ID: | http://purl.org/au-research/grants/arc/DP140100148 http://purl.org/au-research/grants/arc/DP130100005 |
Published version: | http://dx.doi.org/10.1111/1365-2745.13468 |
Appears in Collections: | Agriculture, Food and Wine publications Aurora harvest 8 |
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