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Plant function and evolutionary biology
RESEARCH ARTICLE

Phosphorus deficiency alters scaling relationships between leaf gas exchange and associated traits in a wide range of contrasting Eucalyptus species

Nur H. A. Bahar A B , Paul P. G. Gauthier C D , Odhran S. O’Sullivan A , Thomas Brereton E F , John R. Evans A G and Owen K. Atkin A B H
+ Author Affiliations
- Author Affiliations

A Division of Plant Sciences, Research School of Biology, The Australian National University, Canberra, ACT 2601, Australia.

B ARC Centre of Excellence in Plant Energy Biology, Research School of Biology, Australian National University, Canberra, ACT 2601, Australia.

C Department of Geosciences, Princeton University, Princeton, NJ 08544, USA.

D Department of Biology, University of New Mexico, Albuquerque, NM 87131, USA.

E Research School of Chemistry, Australian National University, Canberra, ACT 2601, Australia.

F Agriculture and Food, CSIRO, Canberra, ACT 2601, Australia.

G ARC Centre of Excellence for Translational Photosynthesis, Research School of Biology, Australian National University, Canberra, ACT 2601, Australia.

H Corresponding author. Email: owen.atkin@anu.edu.au

Functional Plant Biology 45(8) 813-826 https://doi.org/10.1071/FP17134
Submitted: 4 May 2017  Accepted: 2 February 2018   Published: 16 March 2018

Abstract

Phosphorus (P) limitation is known to have substantial impacts on leaf metabolism. However, uncertainty remains around whether P deficiency alters scaling functions linking leaf metabolism to associated traits. We investigated the effect of P deficiency on leaf gas exchange and related leaf traits in 17 contrasting Eucalyptus species that exhibit inherent differences in leaf traits. Saplings were grown under controlled-environment conditions in a glasshouse, where they were subjected to minus and plus P treatments for 15 weeks. P deficiency decreased P concentrations and increased leaf mass per area (LMA) of newly-developed leaves. Rates of photosynthesis (A) and respiration (R) were also reduced in P-deficient plants compared with P-fertilised plants. By contrast, P deficiency had little effect on the temperature sensitivity of R. Irrespective of P treatment, on a log-log basis A and R scaled positively with increasing leaf nitrogen concentration [N] and negatively with increasing LMA. Although P deficiency had limited impact on A-R-LMA relationships, rates of CO2 exchange per unit N were consistently lower in P-deficient plants. Our results highlight the importance of P supply for leaf carbon metabolism and show how P deficiencies (i.e. when excluding confounding genotypic and environmental effects) can have a direct effect on commonly used leaf trait scaling relationships.

Additional keywords: eucalypt, leaf respiration, photosynthesis, scaling relationships.


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