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However, it remains unclear how allocating leaf P to biochemical fractions, including specific P\u2010containing metabolites, contributes to instantaneous photosynthetic P\u2010use efficiency (iPPUE) and the position of species along the leaf economics spectrum (LES).<\/jats:p>\n                      <\/jats:list-item>\n                      <jats:list-item>\n                        <jats:p>We measured LES\u2010associated traits (leaf mass per area, light\u2010saturated photosynthetic rate, and P and nitrogen concentrations) and iPPUE in 12 coexisting Proteaceae, Fabaceae, Myrtaceae and Ericaceae from two severely P\u2010impoverished soils. We characterised patterns of P allocation into lipids, nucleic acids, metabolites, a residual fraction and inorganic P, and identified P\u2010containing metabolites within the metabolite\u2010P fraction.<\/jats:p>\n                      <\/jats:list-item>\n                      <jats:list-item>\n                        <jats:p>We identified multiple P\u2010utilisation strategies that were both species\u2010dependent and soil context\u2010dependent. The iPPUE and LES scores, representing leaf\u2010level resource\u2010use strategies, were positively associated with P concentrations in nucleic acids and the residual P fraction. Concentrations of key P\u2010containing metabolites of the Calvin\u2013Benson cycle, ribulose\u20101,5\u2010bisphosphate and 3\u2010phosphoglycerate, were positively correlated with and served as strong predictors of iPPUE and resource\u2010use strategies within the LES.<\/jats:p>\n                      <\/jats:list-item>\n                      <jats:list-item>\n                        <jats:p>Species in severely P\u2010impoverished habitats exhibited species\u2010dependent and soil context\u2010dependent P\u2010allocation patterns and maintained specific P\u2010containing metabolite concentrations. These trait combinations underpin high iPPUE and enable multiple resource\u2010use strategies.<\/jats:p>\n                      <\/jats:list-item>\n                    <\/jats:list>\n                  <\/jats:p>","DOI":"10.1111\/nph.70955","type":"journal-article","created":{"date-parts":[[2026,1,26]],"date-time":"2026-01-26T07:52:38Z","timestamp":1769413958000},"page":"905-920","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["Biochemical phosphorus allocation is linked to photosynthetic phosphorus\u2010use efficiency in a phosphorus\u2010impoverished environment"],"prefix":"10.1111","volume":"250","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8620-6664","authenticated-orcid":false,"given":"Ling\u2010Ling","family":"Chen","sequence":"first","affiliation":[{"name":"School of Biological Sciences, University of Western Australia  Perth WA 6009 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