Poor regulation of phosphorus uptake and rhizosphere carboxylates in three phosphorus-hyperaccumulating species of Ptilotus

Suriyagoda, Lalith; Tibbett, Mark; Edmonds-Tibbett, Tammy; Cawthray, Gregory R.; Ryan, Megan H.

doi:10.1007/s11104-015-2784-y

Cited by 9 publications

(3 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The exudation rate for C. arietinum (C) would allow accumulation of the carboxylate amounts present in the rhizosheath in <1 h. This rapid exudation could perhaps be a response to fast microbial degradation, as found for citrate and malonate (Martin et al 2016), or losses through soil sorption (Suriyagoda et al 2016). However, these factors would have had relatively little impact in the river sand used in our experiment, as soil sorption and microbial degradation are minimal (Ryan et al 2012).…”

Section: Exudation Ratesmentioning

confidence: 97%

The carboxylate composition of rhizosheath and root exudates from twelve species of grassland and crop legumes with special reference to the occurrence of citramalate

et al. 2018

View full text Add to dashboard Cite

Low-molecular-weight organic anions (carboxylates) influence rhizosphere processes and may enhance plant phosphorus acquisition. We examined the root exudate profile of a range of pasture and grain legumes and focused on the little-investigated carboxylate, citramalate. Methods Twelve species of pasture legumes and herbs, including four Lotus spp. and two crop legumes, Cicer arietinum and Lupinus albus, were grown in a glasshouse for six weeks. The composition and amounts of carboxylates were measured in rhizosheath soil as well as in root exudates from roots washed free of their rhizosheath. Results Citrate and malate were found in the rhizosheath of all species. However, citramalate was present in the rhizosheath of only Lotus species (10-82% of total exuded carboxylates). Cicer arietinum had the largest amount of carboxylates in its rhizosheath and fastest rate of carboxylate exudation into the trap solution. Conclusions Citrate and malate were found in the rhizosheath of all species in this study, but citramalate was only found in the root exudates and rhizosheath of Lotus spp. Further investigation into the role of citramalate in Lotus spp. is merited.

show abstract

Section: Exudation Ratesmentioning

confidence: 97%

The carboxylate composition of rhizosheath and root exudates from twelve species of grassland and crop legumes with special reference to the occurrence of citramalate

et al. 2018

View full text Add to dashboard Cite

show abstract

“…Oburger [ 99 ] found that the adsorption and desorption isotherms of organic acids could be described by the Freundlich equation and the dynamic sorption model. This model succeeds in both predicting the solid solution partitioning of citrate in soils and demonstrating the plateau and steady state concentrations of citrate in solution, highlighting the key effects of organic acid dynamics on the P i adsorption-desorption reactions and the functional roles of PSM in soil [ 98 , 100 ].…”

Section: Psm-derived P Desorption From Clay Mineralsmentioning

confidence: 99%

Roles of Phosphate Solubilizing Microorganisms from Managing Soil Phosphorus Deficiency to Mediating Biogeochemical P Cycle

Tian

Zhang

et al. 2021

Biology

207

102

View full text Add to dashboard Cite

Phosphorus (P) is a vital element in biological molecules, and one of the main limiting elements for biomass production as plant-available P represents only a small fraction of total soil P. Increasing global food demand and modern agricultural consumption of P fertilizers could lead to excessive inputs of inorganic P in intensively managed croplands, consequently rising P losses and ongoing eutrophication of surface waters. Despite phosphate solubilizing microorganisms (PSMs) are widely accepted as eco-friendly P fertilizers for increasing agricultural productivity, a comprehensive and deeper understanding of the role of PSMs in P geochemical processes for managing P deficiency has received inadequate attention. In this review, we summarize the basic P forms and their geochemical and biological cycles in soil systems, how PSMs mediate soil P biogeochemical cycles, and the metabolic and enzymatic mechanisms behind these processes. We also highlight the important roles of PSMs in the biogeochemical P cycle and provide perspectives on several environmental issues to prioritize in future PSM applications.

show abstract

“…3a, b), suggesting that the loss of each OA by microbial degradation or mineral adsorption in the rhizosphere was in proportion to what were produced by plants and hence the treatment effects were similar for those two measures. However, for M. stipoides acetic acid was observed in OA rhizo but not in OA exuded : this likely reflected acetic acid being derived from rhizosphere microbes (Suriyagoda et al 2016). On the other hand, fumaric acid from M. stipoides and E. tereticornis was less abundant in OA rhizo than OA exuded , suggesting it was rapidly degraded by microbes or adsorbed onto soil particles.…”

Section: Discussionmentioning

confidence: 83%

CO2 concentration and water availability alter the organic acid composition of root exudates in native Australian species

2023

View full text Add to dashboard Cite

Purpose Root exudation of organic acids (OAs) facilitates plant P uptake from soil, playing a key role in rhizosphere nutrient availability. However, OA exudation responses to CO2 concentrations and water availability remain largely untested. Methods We examined the effects of CO2 and water on OA exudates in three Australian woodland species: Eucalyptus tereticornis, Hakea sericea and Microlaena stipoides. Seedlings were grown in a glasshouse in low P soil, exposed to CO2 (400 ppm [aCO2] or 540 ppm [eCO2]) and water treatments (100% water holding capacity [high-watered] or 25–50% water holding capacity [low-watered]). After six weeks, we collected OAs from rhizosphere soil (OArhizo) and trap solutions in which washed roots were immersed (OAexuded). Results For E. tereticornis, the treatments changed OArhizo composition, driven by increased malic acid in plants exposed to eCO2 and increased oxalic acid in low-watered plants. For H. sericea, low-watered plants had higher OAexuded per plant (+ 116%) and lower OArhizo per unit root mass (–77%) associated with larger root mass but fewer cluster roots. For M. stipoides, eCO2 increased OAexuded per plant (+ 107%) and per unit root mass (+ 160%), while low-watered plants had higher citric and lower malic acids for OArhizo and OAexuded: changes in OA amounts and composition driven by malic acid were positively associated with soil P availability under eCO2. Conclusion We conclude that eCO2 and altered water availability shifted OAs in root exudates, modifying plant–soil interactions and the associated carbon and nutrient economy.

show abstract

Poor regulation of phosphorus uptake and rhizosphere carboxylates in three phosphorus-hyperaccumulating species of Ptilotus

Cited by 9 publications

References 47 publications

The carboxylate composition of rhizosheath and root exudates from twelve species of grassland and crop legumes with special reference to the occurrence of citramalate

The carboxylate composition of rhizosheath and root exudates from twelve species of grassland and crop legumes with special reference to the occurrence of citramalate

Roles of Phosphate Solubilizing Microorganisms from Managing Soil Phosphorus Deficiency to Mediating Biogeochemical P Cycle

CO2 concentration and water availability alter the organic acid composition of root exudates in native Australian species

Contact Info

Product

Resources

About