Please use this identifier to cite or link to this item:
https://hdl.handle.net/2440/131727
Citations | ||
Scopus | Web of Science® | Altmetric |
---|---|---|
?
|
?
|
Type: | Journal article |
Title: | Accumulation of phosphorus and calcium in different cells protects the phosphorus-hyperaccumulator Ptilotus exaltatus from phosphorus toxicity in high-phosphorus soils |
Author: | Ye, D. Clode, P.L. Hammer, T.A. Pang, J. Lambers, H. Ryan, M.H. |
Citation: | Chemosphere, 2021; 264(1):128438-1-128438-12 |
Publisher: | Elsevier |
Issue Date: | 2021 |
ISSN: | 0045-6535 1879-1298 |
Statement of Responsibility: | Daihua Ye, Peta L.Clode, Timothy A.Hammer, Jiayin Pang, Hans Lambers, Megan H.Ryan |
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. |
Keywords: | Amaranthaceae Plant Leaves Calcium Phosphorus Soil |
Rights: | © 2020 Elsevier Ltd. All rights reserved. |
DOI: | 10.1016/j.chemosphere.2020.128438 |
Grant ID: | http://purl.org/au-research/grants/arc/FT140100103 |
Published version: | http://dx.doi.org/10.1016/j.chemosphere.2020.128438 |
Appears in Collections: | Aurora harvest 8 Environment Institute publications |
Files in This Item:
There are no files associated with this item.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.