Plant – Microbial and mineral contributions to amino acid and protein organic matter accumulation during 4000 years of pedogenesis

Moon, Jin-Young; Ma, Li; Xia, Kang; Williams, Mark A.

doi:10.1016/j.soilbio.2016.05.011

Cited by 15 publications

(14 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This may indicate a plant nurturing effect on bacterial communities that becomes significantly more relevant in soils with challenging conditions, such as arctic soil. Although we cannot exclude that the PCR-based approach we used may have undersampled certain taxa in the bulk soil [ 35 ], we speculate that in glacier moraine and desert soils, plant exudates may represent remarkably diverse additions to the poor carbon source landscape of the barren bulk soil that may enhance diversity in the rhizosphere (Dümig et al 2012; [ 36 ]).…”

Section: Resultsmentioning

confidence: 99%

“…Bacterial diversity in the bulk soil significantly correlated with P, TOC/NKT, Ca, K exc and total K, Mg, Na (DistLM, AICc = 118.71, R 2 = 0.91), and, among metabolites, with sugars, amino acids, and organic acids (DistLM, AICc = 141.16, R 2 = 0.51). In another chronosequence, the belowground bacterial community correlated significantly with the amino-acid distribution [ 36 ]. Bacterial diversity in the rhizosphere significantly correlated with amino acids and sugars (DistLM, AICc = 129.15, R 2 = 0.40), and with CEC and K exc (DistLM, AICc = 125.87, R 2 = 0.49), which have been linked to the water holding capacity and nutrient availability in cold desert soils [ 7 , 17 ].…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

The stage of soil development modulates rhizosphere effect along a High Arctic desert chronosequence

et al. 2018

View full text Add to dashboard Cite

In mature soils, plant species and soil type determine the selection of root microbiota. Which of these two factors drives rhizosphere selection in barren substrates of developing desert soils has, however, not yet been established. Chronosequences of glacier forelands provide ideal natural environments to identify primary rhizosphere selection factors along the changing edaphic conditions of a developing soil. Here, we analyze changes in bacterial diversity in bulk soils and rhizospheres of a pioneer plant across a High Arctic glacier chronosequence. We show that the developmental stage of soil strongly modulates rhizosphere community assembly, even though plant-induced selection buffers the effect of changing edaphic factors. Bulk and rhizosphere soils host distinct bacterial communities that differentially vary along the chronosequence. Cation exchange capacity, exchangeable potassium, and metabolite concentration in the soil account for the rhizosphere bacterial diversity. Although the soil fraction (bulk soil and rhizosphere) explains up to 17.2% of the variation in bacterial microbiota, the soil developmental stage explains up to 47.7% of this variation. In addition, the operational taxonomic unit (OTU) co-occurrence network of the rhizosphere, whose complexity increases along the chronosequence, is loosely structured in barren compared with mature soils, corroborating our hypothesis that soil development tunes the rhizosphere effect.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

The stage of soil development modulates rhizosphere effect along a High Arctic desert chronosequence

et al. 2018

View full text Add to dashboard Cite

show abstract

“…This suggests that the acidic (pH 4), c . 300 000‐yr‐old soils at our site may have less affinity for positive charges (Moon et al ., 2016) and may be old enough to favour the transport of DON, which increases with soil age (Whittinghill & Hobbie, 2011). Indeed, we found that 3 H‐labelled lysine – a positively charged amino acid – travelled farther than neutral or negatively charged amino acids in sterile ‘slabs’ of organic soil from our site.…”

Section: Discussionmentioning

confidence: 99%

“…Organic nitrogen (N) makes up most the N in soils and consists mostly of peptides, proteins, and free amino acids (Näsholm et al ., 2009; Warren, 2014; Moon et al ., 2016; Warren, 2021). Before the early 1990s, however, it was generally thought that plants took up almost only inorganic forms of N (ammonium (NH 4 + ) and nitrate (NO 3 – )) and that organic N had to first be mineralised by soil microorganisms to become available to plants (Schimel & Bennett, 2004).…”

Section: Introductionmentioning

confidence: 99%

Amino acids dominate diffusive nitrogen fluxes across soil depths in acidic tussock tundra

et al. 2021

View full text Add to dashboard Cite

Summary Organic nitrogen (N) is abundant in soils, but early conceptual frameworks considered it nonessential for plant growth. It is now well recognised that plants have the potential to take up organic N. However, it is still unclear whether plants supplement their N requirements by taking up organic N in situ: at what rate is organic N diffusing towards roots and are plants taking it up? We combined microdialysis with live‐root uptake experiments to measure amino acid speciation and diffusion rates towards roots of Eriophorum vaginatum. Amino acid diffusion rates (321 ng N cm−2 h−1) were c. 3× higher than those for inorganic N. Positively charged amino acids made up 68% of the N diffusing through soils compared with neutral and negatively charged amino acids. Live‐root uptake experiments confirmed that amino acids are taken up by plants (up to 1 µg N g−1 min−1 potential net uptake). Amino acids must be considered when forecasting plant‐available N, especially when they dominate the N supply, and when acidity favours proteolysis over net N mineralisation. Determining amino acid production pathways and supply rates will become increasingly important in projecting the extent and consequences of shrub expansion, especially considering the higher C : N ratio of plants relative to soil.

show abstract

“…Microbial AA were analyzed as previously reported 52,53 . The lysate was amended with 20 mM NaN 3 and then spiked with 8 μL 2.5 mM internal standard, α-Aminobutyric acid (AABA) to account of AA recovery.…”

Section: Methodsmentioning

confidence: 99%

Drought-induced soil microbial amino acid and polysaccharide change and their implications for C-N cycles in a climate change world

Kakumanu

Williams

2019

Sci Rep

Self Cite

View full text Add to dashboard Cite

High microbial carbon (MBC) demand, a proxy for energy demand (cost), during soil microbial response to stressors such as drought are a major gap in understanding global biogeochemical cycling of carbon (C) and nitrogen (N). The dynamics of two dominant microbial pools (amino acids; AA and exopolymeric substances; EPS) in soils exposed to drying and C and N amendment to mimic both low and high nutrient soil habitats were examined. It was hypothesized that dynamics of EPS and AA (osmolytes) would be greater when soil drying was preceded by a pulse of bioavailable C and N. Drying reduced AA content, even as overall soil MBC increased (~35%). The increase in absolute amounts and mol% of certain AA (eg: Taurine, glutamine, tyrosine, phenylalanine) in the driest treatment (−10 MPa) were similar in both soils regardless of amendment suggesting a common mechanism underlying the energy intensive acclimation across soils. MBC and EPS, both increased ~1.5X and ~3X due to drying and especially drying associated with amendment. Overall major pools of C and N based microbial metabolites are dynamic to drying (drought), and thus have implications for earth’s biogeochemical fluxes of C and N, perhaps costing 4–7% of forest fixed photosynthetic C input during a single drying (drought) period.

show abstract

Plant – Microbial and mineral contributions to amino acid and protein organic matter accumulation during 4000 years of pedogenesis

Cited by 15 publications

References 50 publications

The stage of soil development modulates rhizosphere effect along a High Arctic desert chronosequence

The stage of soil development modulates rhizosphere effect along a High Arctic desert chronosequence

Amino acids dominate diffusive nitrogen fluxes across soil depths in acidic tussock tundra

Drought-induced soil microbial amino acid and polysaccharide change and their implications for C-N cycles in a climate change world

Contact Info

Product

Resources

About