Page Banner

United States Department of Agriculture

Agricultural Research Service

Title: Patterns of Recovery of Bradford Total Protein (Glomalin) from Appalachian Soils: Effects of Land Use, Depth, Extraction Reagent and Tannin

item Gonzalez, Javier
item Halvorson, Jonathan

Submitted to: Ecological Society of America Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: April 15, 2005
Publication Date: August 7, 2005
Citation: Gonzalez, J.M., Halvorson, J.J. 2005. Patterns of recovery of Bradford total protein (glomalin) from Appalachian soils: Effects of land use, depth, extraction reagent and tannin. Ecological Society of America Abstracts CD-ROM. Poster presentation at the 2005 Annual Meeting of the Ecological Society of America, August 7-12, 2005, Montreal, Canada.

Technical Abstract: Total protein, determined by the Bradford assay is thought to represent glomalin, an important soil glycoprotein related to aggregation and soil carbon storage. We measured Bradford reactive protein (BRP) in soil from pastures, hayfields, cultivated fields or “natural” areas in southwestern West Virginia. We found highest concentrations of BRP near the soil surface, decreasing significantly with depth. Soil from “natural” areas contained highest concentrations of BRP compared to pastures, hayfields, or cultivated fields. Extracting soil with several different reagents indicated differences in BRP recovery efficiency possibly related to net electrical charge of the extractant and more apparent in cultivated soils than in “natural” areas. Formation of dark-colored substances during extraction suggests the Bradford assay may overestimate soil protein when tannins are present in the sample. Recovery of less soluble-N and lower E4/E6 ratios suggest tannins may form non-extractable N-containing complexes.

Last Modified: 4/22/2015