Rhizospheric Chemical Signals and Soil Nutrient Transformation

doi:10.13560/j.cnki.biotech.bull.1985.2020-0703

Abstract

Abstract: Though nutrient cycling in a farmland ecosystem is mainly driven by soil microbes,rhizospheric chemical signals can significantly change the composition of soil microbes and affect nutrient transformation, thus it plays a key role in promoting plant growth and resisting biotic and abiotic stresses. At present,the signal transmission between plants and mycorrhizal fungi or rhizobia in early stage has been extended to the study of its interactions with non-symbiotic microorganisms. Recently, it has been found that rhizospheric signal substances can shape the rhizosphere beneficial microbiome. This paper focuses on the recent domestic and international research progress in rhizospheric chemical signals and soil nutrient transformation. First,the concept of the chemical signals in the rhizosphere is proposed,and the types and functions of the signal substances are summarized. Then the effects of signal substances on the conversion of nitrogen,phosphorus and iron nutrients involved in the plant-plant,plant-microbe and microbe-microbe interactions are further discussed,and the deficiencies of current researches are analyzed. Finally,the future research direction of rhizospheric chemical signals is prospected,and the importance of techniques such as chemical detection,multi-omics and synthetic bacterial community in the rhizosphere chemical signaling research is emphasized.

Key words: root exudates, rhizosphere microbiome, rhizosphere dialogue, nitrogen use efficiency, quorum-sensing signal

LU Yu-fang, SHI Wei-ming. Rhizospheric Chemical Signals and Soil Nutrient Transformation[J]. Biotechnology Bulletin, 2020, 36(9): 14-24.

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