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Macromolecular and chemical features of the excreted extracellular polysaccharides in induced biological soil crusts of different ages
Chen, Lanzhou1; Rossi, Federico2; Deng, Songqiang1; Liu, Yongding3; Wang, Gaohong3; Adessi, Alessandra2; De Philippis, Roberto2
2014-11-01
Source PublicationSOIL BIOLOGY & BIOCHEMISTRY
ISSN0038-0717
Volume78Pages:1-9
AbstractThe development of biological soil crusts (BSCs) is widely recognized as beneficial to soil fertility due to their contribution to the stabilization of soils and to the increase in their carbon and moisture content. An important role in these processes is played by the extracellular polysaccharidic (EPS) matrix embedding microbial cells and soil particles in BSCs. The present study was aimed at investigating the molecular and chemical features of the EPSs and the degradation processes of the polysaccharidic matrix (i.e. dehydrogenase and sucrase activities) in induced biological soil crusts (IBSCs) of different ages displayed within an investigation area in Hobq Desert (Dalatequi County, Inner Mongolia, China). Two operationally-defined EPS fractions, the colloidal (C-EPS) and the EDTA extractable (tightly bound, TB-EPS) fractions, were analyzed. In BSCs, C-EPSs are loosely bound to cells and sediments while TB-EPSs are tightly bound to the crustal biotic and abiotic constituents of the crusts. In this study, the C-EPS and TB-EPS fractions extracted from the IBSCs of different age (4-, 6- and 8-years old IBSCs) were found present in comparable amounts but showed marked differences in terms of their molecular size distribution and monosaccharidic composition. C-EPS showed to be mostly constituted by sugar fractions with molecular weight (MW) distributed in the range 2000-76 kDa and in the range 64-0.34 kDa. Conversely, the TB-EPSs showed to be prominently constituted by one fraction having a MW in the range 2000-76 kDa. While the chemical and macromolecular characteristics of TB-EPSs did not show significant changes with the age of the crusts, the older IBSCs showed a lower content of low MW C-EPSs, as well a higher number of different types of monosaccharides constituting the C-EPS. Moving from these results, it can be hypothesized that C-EPSs, which are dispersed in the soil and thus more accessible, have been rather easily degraded by the heterotrophic microorganisms dwelling in mature IBSCs and reduced to low MW carbohydrates that are easily metabolized by chemoheterotrophs. This hypothesis is supported by the higher activity observed in older IBSCs of the two enzymes associated with sugar degradation in the soil, dehydrogenases and sucrases, that is consistent with an increased release of low MW carbohydrates in the crusts.
SubtypeArticle
KeywordPolysaccharidic Matrix Colloidal Exopolysaccharide Tightly-bound Exopolysaccharide Molecular Size Distribution Monosaccharide Composition Soil Erosion Sucrase Activity Dehydrogenase Activity
DOI10.1016/j.soilbio.2014.07.004
WOS HeadingsScience & Technology ; Life Sciences & Biomedicine
Indexed BySCI
Language英语
WOS Research AreaAgriculture
WOS SubjectSoil Science
WOS KeywordENZYME-ACTIVITIES ; EXOCELLULAR POLYSACCHARIDES ; CYANOBACTERIAL INOCULATION ; HYDROLYSIS RATES ; BENTHIC DIATOMS ; INNER-MONGOLIA ; TENGGER-DESERT ; ALGAL CRUSTS ; EXOPOLYSACCHARIDES ; CHINA
WOS IDWOS:000343950600001
Citation statistics
Cited Times:24[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ihb.ac.cn/handle/342005/20358
Collection水环境工程研究中心
Affiliation1.Wuhan Univ, Sch Resource & Environm Sci, Hubei Key Lab Biomass Resources Chem & Environm B, Wuhan 430079, Peoples R China
2.Univ Florence, Dept Agnfood Prod & Environm Sci, I-50144 Florence, Italy
3.Chinese Acad Sci, Inst Hydrobiol, State Key Lab Fresh Water Ecol & Biotechnol, Wuhan 430072, Peoples R China
Recommended Citation
GB/T 7714
Chen, Lanzhou,Rossi, Federico,Deng, Songqiang,et al. Macromolecular and chemical features of the excreted extracellular polysaccharides in induced biological soil crusts of different ages[J]. SOIL BIOLOGY & BIOCHEMISTRY,2014,78:1-9.
APA Chen, Lanzhou.,Rossi, Federico.,Deng, Songqiang.,Liu, Yongding.,Wang, Gaohong.,...&De Philippis, Roberto.(2014).Macromolecular and chemical features of the excreted extracellular polysaccharides in induced biological soil crusts of different ages.SOIL BIOLOGY & BIOCHEMISTRY,78,1-9.
MLA Chen, Lanzhou,et al."Macromolecular and chemical features of the excreted extracellular polysaccharides in induced biological soil crusts of different ages".SOIL BIOLOGY & BIOCHEMISTRY 78(2014):1-9.
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