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The role of microbes in the increase of organic phosphorus availability in the rhizosheath of cover crops.
Plant Soil 476, 353–373 (2022)
Publ. Version/Full Text
Research data
DOI
Background and aims: The characterisation of plant-available phosphorus (P) pools and the assessment of the microbial community in the rhizosheath of cover crops can improve our understanding of plant–microbe interactions and P availability. Methods: Mustard (Sinapis alba), phacelia (Phacelia tanacetifolia) and buckwheat (Fagopyrum esculentum) were grown as cover crops before soybean (Glycine max) in an on-farm experiment on a soil low in available P in southwest Germany. The cycling of P through the cover crop biomass and the enzyme-availability of organic P (Porg) pools in the cover crop rhizosheath were characterised. The soil microbial community (PLFA), activity (acid and alkaline phosphomonoesterase, as well as phosphodiesterase), and microbial P were assessed. The abundance of 16S-rRNA and phoD, coding for alkaline phosphomonoesterase in bacteria, were quantified using real-time qPCR. Results: Mustard contained the greatest amount of P in its large biomass. In the rhizosheath of all cover crops, the concentration of enzyme-labile Porg was higher than that in the control bulk soil, along with substantial increases of microbial abundance and activity. There were little differences among cover crop species, few changes in the bulk soil and only a limited carryover effect to soybean, except for fungi. Conclusions: Turnover of microbial biomass, especially saprotrophic fungi, increased by rhizodeposition of cover crop roots; this was likely responsible for the observed increases in enzyme-available Porg. Microbial function was correlated linearly with microbial biomass, and the data of enzyme activity and phoD did not suggest a difference of their specific activity between bulk and rhizosheath soil.
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Publication type
Article: Journal article
Document type
Scientific Article
Keywords
Enzyme Addition Assay ; Nutrient Management ; P Mobilisation ; Plant–microbe Interactions ; Plfa ; Rhizosphere
ISSN (print) / ISBN
0032-079X
e-ISSN
1573-5036
Journal
Plant and Soil
Quellenangaben
Volume: 476,
Pages: 353–373
Publisher
Springer
Non-patent literature
Publications
Reviewing status
Peer reviewed
Institute(s)
Research Unit Comparative Microbiome Analysis (COMI)
Grants
Horizon 2020
Ministry of Agriculture and Consumer Protection of Baden-Wuerttemberg
Ministry of Agriculture and Consumer Protection of Baden-Wuerttemberg