Direct foliar uptake of phosphorus from desert dust
© 2021 The Authors New Phytologist © 2021 New Phytologist Foundation.
| Publié dans: | The New phytologist. - 1984. - 230(2021), 6 vom: 01. Juni, Seite 2213-2225 |
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| Auteur principal: | |
| Autres auteurs: | , , |
| Format: | Article en ligne |
| Langue: | English |
| Publié: |
2021
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| Accès à la collection: | The New phytologist |
| Sujets: | Journal Article Research Support, Non-U.S. Gov't desert dust foliar uptake leaf surface organic exudates phosphorus plant nutrition Dust Phosphorus |
| Résumé: | © 2021 The Authors New Phytologist © 2021 New Phytologist Foundation. Phosphorus (P) scarcity constrains plant growth in many ecosystems worldwide. In P-poor ecosystems, the biogeochemical paradigm links plant productivity with the deposition of P-rich dust originating from desert storms. However, dust P usually has low bioavailability and is thought to be utilized solely via roots. We applied desert dust on the leaf surface of P-deficient and P-sufficient wheat, chickpea and maize to test the feasibility of direct foliar uptake of dust-P and investigate its related acquisition mechanisms. Foliar dust doubled the growth of P-deficient chickpea and wheat, crops originating near the Syrian Desert. P deficiency stimulated several leaf modifications that enabled acquisition of up to 30% of the sparingly soluble dust-P that is conventionally perceived as unavailable. These modifications increased foliar dust capture, acidified the leaf surface and, in chickpea, enhanced exudation of P-solubilizing organic acids. Maize (originating far from deserts) displayed only a marginal response to dust. The dramatic response of chickpea and wheat in comparison to maize suggests that plants that evolved in dust-rich ecosystems adopted specialized utilization strategies. Interestingly, the abovementioned foliar responses are comparable to known P uptake root responses. Given that P limitation is almost universal, a foliar P uptake pathway will have significant ecological and agricultural implications |
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| Description: | Date Completed 04.06.2021 Date Revised 04.06.2021 published: Print-Electronic Citation Status MEDLINE |
| ISSN: | 1469-8137 |
| DOI: | 10.1111/nph.17344 |