Leaf manganese concentrations as a tool to assess belowground plant functioning in phosphorus-impoverished environments

Lambers, Hans; Wright, Ian J.; Pereira, Caio Guilherme; Bellingham, Peter J.; Bentley, Lisa Patrick; Boonman, Alex; Cernusak, Lucas A.; Foulds, W; Gleason, Sean M.; Gray, Emma; Hayes, Patrick E.; Kooyman, Robert M.; Malhi, Yadvinder; Richardson, Sarah J.; Shane, Michael W.; Staudinger, Christiana; Stock, William D.; Swarts, N; Turner, Benjamín L.; Turner, John; Veneklaas, Erik J.; Wasaki, Jun; Westoby, Mark; Xu, Yanggui

doi:10.1007/s11104-020-04690-2

Cited by 71 publications

(73 citation statements)

References 90 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…2b). Recently, Mn concentrations in the plant leaf is postulated as a proxy for organic acid exudation activities (Pang et al, 2018;Lambers et al, 2020). This pattern has also been confirmed in pour study, Dipterocarp leaf displays the higher Mn concentrations (1.06 mg g -1 ) than Macaranga leaf (0.34 mg g -1 ) (Fujii et al, 2020).…”

Section: Effects Of Tree Species On Root Exudation Ratessupporting

confidence: 63%

Effects of Tree Species on Root Exudation and Mineralization of Organic Acids in a Tropical Forest

Fujii

Hayakawa

Ningsih

2021

Preprint

View full text Add to dashboard Cite

Aims Root exudation of organic acids is one of strategies for tropical trees to facilitate nutrient uptake from the highly weathered soils. However, paradoxical relationship remains that root exudation also stimulates microbial activities to consume organic acids in the rhizosphere (root-soil interface). Plant-specific root exudation might shape different rhizosphere carbon (C) cycles between tree species. We test whether root exudation and rhizosphere C fluxes of organic acids and sugars differ between dominant dipterocarp trees and pioneer trees (Macaranga spp.). Methods We measured (1) root exudation from mature trees, (2) soil solution concentrations of organic acids and monosaccharides, and (3) mineralization kinetics of 14C-radiolabelled substrates in the rhizosphere and bulk soils of the Dipterocarp and Macaranga trees. Results Malate was a dominant organic acid exuded from Dipterocarp roots, while monosaccharides were dominant exudates of pioneer Macaranga trees. Malate exudation rates by Dipterocarp roots were greater compared to Macaranga roots. Organic acid exudation increased with increasing root surface area and with decreasing soil pH. Microbial activities of malate mineralization were enhanced in the rhizosphere both under Dipterocarp and Macaranga trees, but the C fluxes of malate mineralization by rhizosphere microbes far exceeded root exudation due to microbial malate production in the rhizosphere of Dipterocarp trees. Conclusion Tree species develop different strategies to increase malate concentration in rhizosphere soil directly through root exudation or indirectly through rhizosphere microbial activities to increase malate production, which is favorable for phosphorus solubilization, aluminum detoxification, and lignin degradation in acidic soils.

show abstract

Section: Effects Of Tree Species On Root Exudation Ratessupporting

confidence: 63%

Effects of Tree Species on Root Exudation and Mineralization of Organic Acids in a Tropical Forest

Fujii

Hayakawa

Ningsih

2021

Preprint

View full text Add to dashboard Cite

show abstract

“…This commentary presents several thoughts elicited by the observation of Lambers et al (2021) in this Special Issue that the release of carboxylates by roots increases manganese (Mn) uptake by plants. Manganese (Mn) is an essential plant micronutrient.…”

Section: Commentarymentioning

confidence: 99%

Possible consequences of an inability of plants to control manganese uptake

White

Neugebauer

2021

Plant Soil

View full text Add to dashboard Cite

Background This commentary presents several thoughts elicited by the observation of Lambers et al. (Plant Soil, 2021) in this Special Issue that the release of carboxylates by roots increases manganese (Mn) uptake by plants. Manganese is a plant nutrient, but is toxic in excess. Root cells take up Mn from the rhizosphere solution through non-specific transporters, whose activities are regulated by elements other than Mn, and Mn phytoavailability in soil is also impacted by plant nutritional status of elements other than Mn. These complications could result in a plant being unable to respond appropriately to vagaries in Mn phytoavailability. Scope The release of carboxylates by roots increases Mn phytoavailability and Mn uptake by plants. Lambers et al. (Plant Soil, 2021) suggest that this phenomenon might be used to identify plant species that release carboxylates into the rhizosphere in response to P deficiency. We suggest that, for the approach of Lambers and colleagues to be successful, it is necessary for all plants being compared (1) to be capable of increasing root Mn uptake and leaf Mn concentration should carboxylates be released, and increase these to a similar extent for the approach to be quantitative, and (2) to tolerate the greater tissue Mn concentrations resulting from increased Mn phytoavailability. Conclusions We observe (1) that the leaf Mn requirement, critical leaf Mn concentration for toxicity and capacity for Mn accumulation when grown hydroponically in a nutrient-replete solution are all positively correlated among plant species, which suggests that they might have evolved in parallel, and (2) that, although some orders containing species accumulating large shoot Mn concentrations are typically non-mycorrhizal and release carboxylates into the rhizosphere, such as the Proteales, many orders containing species with this trait are characterised by conventional mycorrhizal associations.

show abstract

“…Assessing below-ground traits from above-ground observations Lambers et al (2021) established that leaf manganese (Mn) concentrations are a signature of phosphorus (P)mobilising carboxylates in the rhizosphere in low-P soils across 727 species in Australia and New Zealand. In their commentary on this paper, White and Neugebauer (2021) conclude that, although some orders containing species accumulating Mn in their shoots are typically non-mycorrhizal and release carboxylates into the rhizosphere, such as the Proteales, many orders containing species with this trait are characterised by conventional mycorrhizal associations.…”

Section: Soil-plant Interactions Are Important For Climate Change Mitigationmentioning

confidence: 99%

Rhizosphere 5 - shining light on the world beneath our feet

Schnepf

2021

Plant Soil

View full text Add to dashboard Cite

show abstract

Leaf manganese concentrations as a tool to assess belowground plant functioning in phosphorus-impoverished environments

Abstract: Revised version without track changesClick here to access/download;Revised version without track changes;Leaf manganese_revised (July 25

Cited by 71 publications

References 90 publications

Effects of Tree Species on Root Exudation and Mineralization of Organic Acids in a Tropical Forest

Effects of Tree Species on Root Exudation and Mineralization of Organic Acids in a Tropical Forest

Possible consequences of an inability of plants to control manganese uptake

Rhizosphere 5 - shining light on the world beneath our feet

Contact Info

Product

Resources

About