Glomalin‐related soil protein in F rench temperate forest soils: interference in the B radford assay caused by co‐extracted humic substances

• Published in: European journal of soil science Vol. 66; no. 2; pp. 311 - 319
• Main Authors: Jorge‐Araújo, P., Quiquampoix, H., Matumoto‐Pintro, P. T., Staunton, S.
• Format: Journal Article
• Language: English
• Published: 01.03.2015
• ISSN: 1351-0754; 1365-2389
• DOI: 10.1111/ejss.12218

Thermostable soil protein, known as glomalin, is an important component of soil carbon stocks. Thought to originate from endomycorrhizal fungi, G lomales, this operationally‐defined fraction of soil organic matter contains proteins of diverse origin as well as non‐protein material, including humic substances. Accumulation results from the balance between production/release and subsequent degradation. Quantification of the protein is subject to uncertainty because of the co‐extraction of other components that interfere with the B radford assay. We studied 10 topsoils from F rench temperate forests, taken from the national forest monitoring network ( R enecofor). Two fractions were extracted, easily extractable ( EE ) at neutral pH and total extractable ( T ) at pH 8. Protein was quantified with the colorimetric B radford method, either by direct calibration using bovine serum albumin ( BSA ) or by extrapolation of the standard addition plot of BSA . Solubilized organic matter was characterized by using absorbance at 465 and 665 nm and by three‐dimensional fluorescence excitation‐emission spectroscopy. Neither soil properties nor forest cover influenced glomalin‐related soil protein ( GRSP ) content. Direct assay gave the GRSP EE to be about 1 g kg −1 soil, and GRSP T in the range 3–10 g kg −1 , accounting for about 2% of soil organic carbon and about 15% of soil nitrogen. Standard addition plots indicated a two to sixfold under‐estimation of protein in total extracts, caused by negative interference with the B radford assay. The GRSP EE was correlated significantly with both estimates of GRSP T . Under‐estimation of GRSP T by direct assay was not related to the E4 : E6 ratio but was correlated significantly with the intensity of absorbance at either 460 or 660 nm and with one of the fluorescence peaks. We conclude that GRSP EE is not necessarily more recent than GRSP T and that both fractions may be probes of protein content, but that absolute contents may be under‐estimated because of co‐extracted humic substances.