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Root Disease Impacts on Root-Rhizosphere Microbial Communities

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Rhizosphere Biology: Interactions Between Microbes and Plants

Part of the book series: Rhizosphere Biology ((RHBIO))

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Abstract

New molecular sequencing technologies have enabled the microbiome associated with plant roots to be studied in greater detail, generally by extracting and sequencing DNA from the whole root or rhizosphere. Roots have multiple niches which are known to vary in their exudation profiles and resultant microbial populations, but this does not appear to be recognised in most studies where the taxa and functional characteristics inhabiting different niches are masked. In particular, there is evidence that diseased root lesions caused by soilborne fungal pathogens select for a different microflora compared to healthy roots, and the microflora from diseased sites is more suppressive to disease. In cereal cropping systems, the development of soils suppressive to Rhizoctonia root rot and take-all disease follow a period of higher disease levels before becoming suppressive. In this chapter, the case is made that increased root infection during these higher disease levels is a driver for change in the root microbiome leading to an increase in disease suppression. As such, future work on elucidating the taxa and mechanisms that contribute to suppression should recognise diseased root lesions as a special niche important to this process.

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Correspondence to Stephen Barnett .

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Barnett, S. (2021). Root Disease Impacts on Root-Rhizosphere Microbial Communities. In: Gupta, V.V.S.R., Sharma, A.K. (eds) Rhizosphere Biology: Interactions Between Microbes and Plants. Rhizosphere Biology. Springer, Singapore. https://doi.org/10.1007/978-981-15-6125-2_8

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