Growing in phosphorus-impoverished habitats in south-western Australia: How general are phosphorus-acquisition and -allocation strategies among Proteaceae, Fabaceae and Myrtaceae species?

Publisher: John Wiley & Sons Ltd Country of Publication: United States NLM ID: 9309004 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1365-3040 (Electronic) Linking ISSN: 01407791 NLM ISO Abbreviation: Plant Cell Environ Subsets: MEDLINE

Publication: Hoboken, NJ : John Wiley & Sons Ltd.
Original Publication: Oxford, UK : Blackwell Scientific Publications

Phosphorus*/metabolism ; Proteaceae*/metabolism ; Proteaceae*/physiology ; Fabaceae*/metabolism ; Ecosystem* ; Plant Leaves*/metabolism ; Myrtaceae*/metabolism; Photosynthesis ; Western Australia ; Soil/chemistry ; Rhizosphere ; Plant Roots/metabolism

Numerous phosphorus (P)-acquisition and -utilisation strategies have evolved in plants growing in severely P-impoverished environments. Although these strategies have been well characterised for certain taxa, like Proteaceae, P-poor habitats are characterised by a high biodiversity, and we know little about how species in other families cope with P scarcity. We compared the P-acquisition and leaf P-allocation strategies of Fabaceae and Myrtaceae with those of Proteaceae growing in the same severely P-impoverished habitat. Myrtaceae and Fabaceae exhibited multiple P-acquisition strategies: P-mining by carboxylates or phosphatases, P uptake facilitated by carboxylate-releasing neighbours, and dependence on the elevated soil P availability after fire. Surprisingly, not all species showed high photosynthetic P-use efficiency (PPUE). Highly P-efficient species showed positive correlations between PPUE and the proportion of metabolite P (enzyme substrates), and negative correlations between PPUE and phospholipids (cellular membranes) and nucleic acid P (mostly ribosomal RNA), while we found no correlations in less P-efficient species. Overall, we found that Myrtaceae and Fabaceae used a wider range of strategies than Proteaceae to cope with P scarcity, at both the rhizosphere and leaf level. This knowledge is pivotal to better understand the mechanisms underlying plant survival in severely nutrient-impoverished biodiverse ecosystems.
(© 2024 The Author(s). Plant, Cell & Environment published by John Wiley & Sons Ltd.)

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Australian Research Council Discovery Grant; Marie Sklodowska-Curie grant; China Scholarship Council; Kwongan Foundation

Keywords: leaf phosphorus fractions; metabolite P; nucleic acid P; phospholipid; photosynthetic phosphorus‐use efficiency

27YLU75U4W (Phosphorus)
0 (Soil)

Date Created: 20240729 Date Completed: 20241105 Latest Revision: 20241105

20241105

10.1111/pce.15038

39072729