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https://hdl.handle.net/2440/131727
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dc.contributor.author | Ye, D. | - |
dc.contributor.author | Clode, P.L. | - |
dc.contributor.author | Hammer, T.A. | - |
dc.contributor.author | Pang, J. | - |
dc.contributor.author | Lambers, H. | - |
dc.contributor.author | Ryan, M.H. | - |
dc.date.issued | 2021 | - |
dc.identifier.citation | Chemosphere, 2021; 264(1):128438-1-128438-12 | - |
dc.identifier.issn | 0045-6535 | - |
dc.identifier.issn | 1879-1298 | - |
dc.identifier.uri | http://hdl.handle.net/2440/131727 | - |
dc.description.abstract | Ptilotus exaltatus accumulates phosphorus (P) to > 40 mg g-1 without toxicity symptoms, while Kennedia prostrata is intolerant of increased P supply. What physiological mechanisms underlie this difference and protect P. exaltatus from P toxicity? Ptilotus exaltatus and K. prostrata were grown in a sandy soil with low-P, high-P and P-pulse treatments. Both species hyperaccumulated P (>20 mg g−1) under high-P and P-pulse treatments; shoot dry weight was unchanged for P. exaltatus, but decreased by >50% for K. prostrata. Under high-P, in young fully-expanded leaves, both species accumulated P predominantly as inorganic P. However, P. exaltatus preferentially allocated P to mesophyll cells and stored calcium (Ca) as occasional crystals in specific lower mesophyll cells, separate from P, while K. prostrata preferentially allocated P to epidermal and spongy mesophyll cells, but co-located P and Ca in palisade mesophyll cells where granules with high [P] and [Ca] were evident. Mesophyll cellular [P] correlated positively with [potassium] for both species, and negatively with [sulfur] for P. exaltatus. Thus, P. exaltatus tolerated a very high leaf [inorganic P] (17 mg g-1), associated with P and Ca allocation to different cell types and formation of Ca crystals, thereby avoiding deleterious precipitation of Ca3(PO4)2. It also showed enhanced [potassium] and decreased [sulfur] to balance high cellular [P]. Phosphorus toxicity in K. prostrata arose from co-location of Ca and P in palisade mesophyll cells. This study advances understanding of leaf physiological mechanisms for high P tolerance in a P-hyperaccumulator and indicates P. exaltatus as a promising candidate for P-phytoextraction. | - |
dc.description.statementofresponsibility | Daihua Ye, Peta L.Clode, Timothy A.Hammer, Jiayin Pang, Hans Lambers, Megan H.Ryan | - |
dc.language.iso | en | - |
dc.publisher | Elsevier | - |
dc.rights | © 2020 Elsevier Ltd. All rights reserved. | - |
dc.source.uri | http://dx.doi.org/10.1016/j.chemosphere.2020.128438 | - |
dc.subject | Amaranthaceae | - |
dc.subject | Plant Leaves | - |
dc.subject | Calcium | - |
dc.subject | Phosphorus | - |
dc.subject | Soil | - |
dc.title | Accumulation of phosphorus and calcium in different cells protects the phosphorus-hyperaccumulator Ptilotus exaltatus from phosphorus toxicity in high-phosphorus soils | - |
dc.type | Journal article | - |
dc.identifier.doi | 10.1016/j.chemosphere.2020.128438 | - |
dc.relation.grant | http://purl.org/au-research/grants/arc/FT140100103 | - |
pubs.publication-status | Published | - |
dc.identifier.orcid | Hammer, T.A. [0000-0003-3816-7933] | - |
Appears in Collections: | Aurora harvest 8 Environment Institute publications |
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