Accumulation of phosphorus and calcium in different cells protects the phosphorus-hyperaccumulator Ptilotus exaltatus from phosphorus toxicity in high-phosphorus soils
Copyright © 2020 Elsevier Ltd. All rights reserved..
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.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2021 |
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| Erschienen: |
2021 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:264 |
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| Enthalten in: |
Chemosphere - 264(2021), Pt 1 vom: 15. Feb., Seite 128438 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Ye, Daihua [VerfasserIn] |
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| Links: |
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| Themen: |
27YLU75U4W |
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| Anmerkungen: |
Date Completed 22.12.2020 Date Revised 22.12.2020 published: Print-Electronic Citation Status MEDLINE |
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| doi: |
10.1016/j.chemosphere.2020.128438 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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NLM316022667 |
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| 245 | 1 | 0 | |a Accumulation of phosphorus and calcium in different cells protects the phosphorus-hyperaccumulator Ptilotus exaltatus from phosphorus toxicity in high-phosphorus soils |
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| 520 | |a Copyright © 2020 Elsevier Ltd. All rights reserved. | ||
| 520 | |a 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 | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a Cell-specific allocation | |
| 650 | 4 | |a High phosphorus tolerance | |
| 650 | 4 | |a Leaf phosphorus fractions | |
| 650 | 4 | |a Phosphorus toxicity | |
| 650 | 4 | |a Phosphorus-hyperaccumulator | |
| 650 | 4 | |a Ptilotus | |
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| 650 | 7 | |a Calcium |2 NLM | |
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| 700 | 1 | |a Clode, Peta L |e verfasserin |4 aut | |
| 700 | 1 | |a Hammer, Timothy A |e verfasserin |4 aut | |
| 700 | 1 | |a Pang, Jiayin |e verfasserin |4 aut | |
| 700 | 1 | |a Lambers, Hans |e verfasserin |4 aut | |
| 700 | 1 | |a Ryan, Megan H |e verfasserin |4 aut | |
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