Life at the conservative end of the leaf economics spectrum: intergeneric variation in the allocation of phosphorus to biochemical fractions in species of Banksia (Proteaceae) and Hakea (Proteaceae).

Autor: Gille CE; School of Biological Sciences, The University of Western Australia, 35 Stirling Highway, Perth, WA, 6009, Australia., Hayes PE; School of Biological Sciences, The University of Western Australia, 35 Stirling Highway, Perth, WA, 6009, Australia., Ranathunge K; School of Biological Sciences, The University of Western Australia, 35 Stirling Highway, Perth, WA, 6009, Australia., Liu ST; School of Biological Sciences, The University of Western Australia, 35 Stirling Highway, Perth, WA, 6009, Australia., Newman RPG; School of Biological Sciences, The University of Western Australia, 35 Stirling Highway, Perth, WA, 6009, Australia., de Tombeur F; School of Biological Sciences, The University of Western Australia, 35 Stirling Highway, Perth, WA, 6009, Australia.; CEFE, Université Montpellier, CNRS, IRD, EPHE, Montpellier, 34000, France., Lambers H; School of Biological Sciences, The University of Western Australia, 35 Stirling Highway, Perth, WA, 6009, Australia., Finnegan PM; School of Biological Sciences, The University of Western Australia, 35 Stirling Highway, Perth, WA, 6009, Australia.
Jazyk: angličtina
Zdroj: The New phytologist [New Phytol] 2024 Oct; Vol. 244 (1), pp. 74-90. Date of Electronic Publication: 2024 Aug 05.
DOI: 10.1111/nph.20015
Abstrakt: In severely phosphorus (P)-impoverished environments, plants have evolved to use P very efficiently. Yet, it is unclear how P allocation in leaves contributes to their photosynthetic P-use efficiency (PPUE) and position along the leaf economics spectrum (LES). We address this question in 10 species of Banksia and Hakea, two highly P-efficient Proteaceae genera. We characterised traits in leaves of Banksia and Hakea associated with the LES: leaf mass per area, light-saturated photosynthetic rates, P and nitrogen concentrations, and PPUE. We also determined leaf P partitioning to five biochemical fractions (lipid, nucleic acid, metabolite, inorganic and residual P) and their possible association with the LES. For both genera, PPUE was negatively correlated with fractional allocation of P to lipids, but positively correlated with that to metabolites. For Banksia only, PPUE was negatively correlated with residual P, highlighting a strategy contrasting to that of Hakea. Phosphorus-allocation patterns significantly explained PPUE but were not linked to the resource acquisition vs resource conservation gradient defined by the LES. We conclude that distinct P-allocation patterns enable species from different genera to achieve high PPUE and discuss the implications of different P investments. We surmise that different LES axes representing different ecological strategies coexist in extremely P-impoverished environments.
(© 2024 The Author(s). New Phytologist © 2024 New Phytologist Foundation.)
Databáze: MEDLINE
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