Journal
BMC BIOLOGY
Volume 20, Issue 1, Pages -Publisher
BMC
DOI: 10.1186/s12915-022-01430-z
Keywords
Bacteria; Circadian rhythms; Fungi; Microbiome; Rhizosphere
Categories
Funding
- Biotechnology and Biological Sciences Research Council [BB/L025892/1]
- Natural Environment Research Council CENTA Doctoral Training Partnership
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Aberrant function of plant circadian clock can lead to altered rhythmicity of rhizosphere bacteria and fungi, resulting in changes in the composition of rhizosphere microbiome with potential consequences for plant health.
Background: Recent studies demonstrated that microbiota inhabiting the plant rhizosphere exhibit diel changes in abundance. To investigate the impact of plant circadian rhythms on bacterial and fungal rhythms in the rhizosphere, we analysed temporal changes in fungal and bacterial communities in the rhizosphere of Ara bidopsis plants overexpressing or lacking function of the circadian clock gene LATE ELONGATED HYPOCOTYL (LHY). Results: Under diel light-dark cycles, the knock-out mutant lhy-1 1 and the gain-of-function mutant lhy-ox both exhibited gene expression rhythms with altered timing and amplitude compared to wild-type plants. Distinct sets of bacteria and fungi were found to display rhythmic changes in abundance in the rhizosphere of both of these mutants, suggesting that abnormal patterns of rhythmicity in the plant host caused temporal reprogramming of the rhizosphere microbiome. This was associated with changes in microbial community structure, including changes in the abundance of fungal guilds known to impact on plant health. Under constant environmental conditions, microbial rhythmicity persisted in the rhizosphere of wild-type plants, indicating control by a circadian oscillator. In contrast, loss of rhythmicity in Ihy-ox plants was associated with disrupted rhythms for the majority of rhizosphere microbiota. Conclusions: These results show that aberrant function of the plant circadian clock is associated with altered rhythmicity of rhizosphere bacteria and fungi. In the long term, this leads to changes in composition of the rhizosphere microbiome, with potential consequences for plant health. Further research will be required to understand the functional implications of these changes and how they impact on plant health and productivity.
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