How functional is a trait? Phosphorus mobilization through root exudates differs little between <i>Carex</i> species with and without specialized dauciform roots

Güsewell, Sabine; Schroth, Martin H.

doi:10.1111/nph.14674

Cited by 37 publications

(32 citation statements)

References 81 publications

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“…However, as the size of the geometry, l, increases assuming the reactions are in equilibrium becomes more appropriate. In contrast, previous experiments are in agreement with the current finding, both Güsewell and Schroth (2017) and Ryan et al (2014) could not detect P uptake gains in high carboxylate exuding plants in comparison to low carboxylate exuding subgenus/near-isogenic species.…”

Section: Microdialysis Probes As Root Analoguessupporting

confidence: 91%

Quantifying citrate-enhanced phosphate root uptake using microdialysis

et al. 2019

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Aims Organic acid exudation by plant roots is thought to promote phosphate (P) solubilisation and bioavailability in soils with poorly available nutrients. Here we describe a new combined experimental (microdialysis) and modelling approach to quantify citrate-enhanced P desorption and its importance for root P uptake. Methods To mimic the rhizosphere, microdialysis probes were placed in soil and perfused with citrate solutions (0.1, 1.0 and 10 mM) and the amount of P recovered from soil used to quantify rhizosphere P availability. Parameters in a mathematical model describing probe P uptake, citrate exudation, P movement and citrate-enhanced desorption were fit to the experimental data. These parameters were Plant Soil

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Section: Microdialysis Probes As Root Analoguessupporting

confidence: 91%

Quantifying citrate-enhanced phosphate root uptake using microdialysis

et al. 2019

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“…Any decline in A area with declining LMA was offset by a disproportionate increase in A mass that slowed the decrease in PNUE relative to the decline in photosynthetic capacity. The scaling relationships of R dark,area and R dark,mass on N area had similar countervailing effects, which were consistent with the respiratory costs of dauciform roots specialized for P uptake in Carex (Güsewell & Schroth, ), as both R dark,area and R dark,mass were associated with increasing P mass . Finally, the shade‐induced decline in LMA was also associated with a disproportionate reduction in P area and corresponding increases in the N : P ratio and growth.…”

Section: Discussionsupporting

confidence: 78%

“…We evaluated changes in the scaling relationships between the LES traits and net production over the course of the experiment (hereafter ‘GROWTH’) for plants grown in regimes differing in above‐ground (shaded vs unshaded) and below‐ground (insufficient vs sufficient P) resource availability. We chose P as a potentially limiting resource because of the influence of P‐availability on global patterns of variation in foliar traits (Maire et al ., ), the functional significance of the N : P ratio (Güsewell, ), the possible role of the N : P ratio in affecting growth (Yu et al ., ; Yan et al ., ), and the specialized mechanisms Carex species have for P uptake (Güsewell & Schroth, ). Additionally, the role of foliar P in the LES is poorly understood compared with the role of foliar N (Crous et al ., ; Onoda et al ., ; Onoda & Wright, ).…”

Section: Methodsmentioning

confidence: 99%

Functional ecology of congeneric variation in the leaf economics spectrum

LaZerte

Waterway

et al. 2019

New Phytologist

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Summary Variation in resource availability can lead to phenotypic plasticity in the traits comprising the world‐wide leaf economics spectrum (LES), potentially impairing plant function and complicating the use of tabulated values for LES traits in ecological studies. We compared 14 Carex (Cyperaceae) species in a factorial experiment (unshaded/shaded × sufficient/insufficient P) to analyze how changes in the network of allometric scaling relationships among LES traits influenced growth under favorable and resource‐limited conditions. Changes in leaf mass per area (LMA) shifted the scaling relationships among LES traits expressed per unit area vs mass in ways that helped to sustain growth under resource limitation. Increases in area‐normalized photosynthetic capacity and foliar nitrogen (N) were correlated with increased growth, offsetting losses associated with mass‐normalized dark respiration and foliar N. These shifts increased the contributions to growth associated with photosynthetic N‐use efficiency and the N : P ratio. Plasticity in LMA is at the hub of the functional role of the LES as an integrated and resilient complex system that balances the relationships among area‐ and mass‐based aspects of gas exchange and foliar nutrient traits to sustain at least some degree of plant growth under differing availabilities of above‐ and below‐ground resources.

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“…Consistently, it has been documented that RA‐Phy activity was less than 1% of total RA‐APase activity in plants, such as Arabidopsis, wheat, and Carex species (Güsewell & Schroth, ; Richardson et al, ; Richardson, Hadobas, & Hayes, ), although RI‐Phy activity could account for about 0.5–5% of total RI‐APase activity in plants (Araújo, Plassard, & Drevon, ; Lung & Lim, ; Richardson et al, ; Sharma & Sahi, ). However, it was observed that RA‐Phy activity accounts for 2.3–3.8% of RA‐APase activity among the tested 39 stylo genotypes (Figures S1 and S2).…”

Section: Discussionmentioning

confidence: 65%

A root‐associated purple acid phosphatase, SgPAP23, mediates extracellular phytate‐P utilization in Stylosanthes guianensis

Liu

Cai

Chen

et al. 2018

Plant Cell & Environment

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As a major component of soil organic phosphorus (P), phytate-P is unavailable to plants unless hydrolysed by phytase to release inorganic phosphate. However, knowledge on natural variation in root-associated phytase activity and its underlying molecular mechanisms in plants remains fragmentary. In this study, variations in root internal and associated phytase activity were observed among 39 genotypes of Stylosanthes guianensis (Stylo), which is well adapted to acid soils. Furthermore, TPRC2001-1, the genotype with the highest root-associated phytase activity, was more capable of utilizing extracellular phytate-P than Fine-stem, the genotype with the lowest root-associated phytase activity. After protein liquid chromatography-tandem mass spectrometry analysis, a purple acid phosphatase (PAP), SgPAP23, was identified and cloned from TPRC2001-1. SgPAP23 exhibited high activity against phytate-P and was mainly localized on the plasma membrane. Furthermore, SgPAP23 overexpression resulted in significant increases of root-associated phytase activity and thus facilitated extracellular phytate-P utilization in both bean (Phaseolus vulgaris) hairy roots and Arabidopsis thaliana. The results herein support the conclusion that SgPAP23 is a primary contributor to the superior extracellular phytate-P utilization in stylo and thus is used to develop cultivars with efficient extracellular phytate-P utilization.

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How functional is a trait? Phosphorus mobilization through root exudates differs little between Carex species with and without specialized dauciform roots

Cited by 37 publications

References 81 publications

Quantifying citrate-enhanced phosphate root uptake using microdialysis

Quantifying citrate-enhanced phosphate root uptake using microdialysis

Functional ecology of congeneric variation in the leaf economics spectrum

A root‐associated purple acid phosphatase, SgPAP23, mediates extracellular phytate‐P utilization in Stylosanthes guianensis

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