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dc.contributor.author | Vardien, Waafeka![]() |
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dc.contributor.author | Mesjasz-Przybylowicz, Jolanta![]() |
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dc.contributor.author | Przybylowicz, Wojciech J.![]() |
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dc.contributor.author | Wang, Yaodong![]() |
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dc.contributor.author | Steenkamp, Emma Theodora![]() |
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dc.contributor.author | Valentine, Alex J.![]() |
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dc.date.accessioned | 2015-01-28T05:53:04Z | |
dc.date.available | 2015-01-28T05:53:04Z | |
dc.date.issued | 2014-11 | |
dc.description.abstract | Legumes have the unique ability to fix atmospheric nitrogen (N2) via symbiotic bacteria in their nodules but depend heavily on phosphorus (P), which affects nodulation, and the carbon costs and energy costs of N2 fixation. Consequently, legumes growing in nutrient-poor ecosystems (e.g., sandstone-derived soils) have to enhance P recycling and/or acquisition in order to maintain N2 fixation. In this study, we investigated the flexibility of P recycling and distribution within the nodules and their effect on N nutrition in Virgilia divaricata Adamson, Fabaceae, an indigenous legume in the Cape Floristic Region of South Africa. Specifically, we assessed tissue elemental localization using micro-particle-induced X-ray emission (PIXE), measured N fixation using nutrient concentrations derived from inductively coupled mass-spectrometry (ICP-MS), calculated nutrient costs, and determined P recycling from enzyme activity assays. Morphological and physiological features characteristic of adaptation to P deprivation were observed for V. divaricata. Decreased plant growth and nodule production with parallel increased root:shoot ratios are some of the plastic features exhibited in response to P deficiency. Plants resupplied with P resembled those supplied with optimal P levels in terms of growth and nutrient acquisition. Under low P conditions, plants maintained an increase in N2-fixing efficiency despite lower levels of orthophosphate (Pi) in the nodules. This can be attributed to two factors: (i) an increase in Fe concentration under low P, and (ii) greater APase activity in both the roots and nodules under low P. These findings suggest that V. divaricata is well adapted to acquire N under P deficiency, owing to the plasticity of its nodule physiology | en_ZA |
dc.description.librarian | am2015 | en_ZA |
dc.description.sponsorship | DST-NRF Centre of Excellence in Tree Health Biotechnology(CTHB). | en_ZA |
dc.description.uri | http://www.elsevier.com/locate/jplph | en_ZA |
dc.identifier.citation | Vardien, W, Mesjasz-Przybylowicz, J, Przybylowicz, WJ, Wang, Y, Steenkamp, ET, Valentine, AJ 2014, 'Nodules from fynbos legume Virgilia divaricata have high functional plasticity under variable P supply levels', Journal of Plant Physiology, vol. 171, no. 18, pp. 1782-1739. | en_ZA |
dc.identifier.issn | 0176-1617 (print) | |
dc.identifier.issn | 1618-1328 (online) | |
dc.identifier.other | 10.1016/j.jplph.2014.08.005 | |
dc.identifier.uri | http://hdl.handle.net/2263/43457 | |
dc.language.iso | en | en_ZA |
dc.publisher | Elsevier | en_ZA |
dc.rights | © 2014 Elsevier GmbH. All rights reserved. Notice : this is the author’s version of a work that was accepted for publication in Journal of Plant Physiology. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Plant Physiology, vol. 171, no. 18, pp.1782-1739, 2014. doi : 10.1016/j.jplph.2014.08.005. | en_ZA |
dc.subject | Phosphorus-deficient | en_ZA |
dc.subject | Legume | en_ZA |
dc.subject | Root-nodule | en_ZA |
dc.subject | N2-fixation | en_ZA |
dc.subject | Acid-phosphatase | en_ZA |
dc.title | Nodules from fynbos legume Virgilia divaricata have high functional plasticity under variable P supply levels | en_ZA |
dc.type | Postprint Article | en_ZA |