Abstract
Rhizosphere microbiota play an important role in maintaining plant root growth. However, the physiological and molecular basis of microbial regulation of root traits remains poorly understood. Here, we report that Massilia efficiently colonizes roots and promotes root elongation. In particular, the M117 strain of Massilia significantly inhibits salicylic acid (SA)-related immune signaling, which is required for M117-mediated root elongation. M117 can directly degrade SA, thereby reducing SA levels in the roots. Integrated omics reveal the presence of multiple SA hydrolytic pathways in M117. Among them, the NagGHAaAb pathway is strongly induced by SA. This pathway regulates root growth and is nonrandomly distributed across Massilia species. Finally, we show that M117 colonization enriches specific bacterial taxa within roots. Our findings reveal a specific pathway employed by rhizosphere bacteria to colonize roots and promote their growth and highlight a useful microbial strategy and information for balancing host immunity and growth.
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Claims 9
Claim · model-written summary
Massilia efficiently colonizes roots.
- Outcome
- efficiently colonizes rootse0
MassiliaNot reportedTaxon
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Massilia efficiently colonizes roots and promotes root elongation”
Claim · model-written summary
Massilia promotes root elongation.
Not reportedTaxonComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Massilia efficiently colonizes roots and promotes root elongation”
Claim · model-written summary
The M117 strain of Massilia significantly inhibits salicylic acid-related immune signaling, which is required for M117-mediated root elongation.
- Treatment
- M117 strain of Massiliae0
- Interactor
- M117 strain of Massiliae0symbiont
- Outcome
- salicylic acid (SA)-related immune signalinge0
- Direction
- inhibitse0
Not reportedTaxonComparator
Verbatim
e0“the M117 strain of Massilia significantly inhibits salicylic acid (SA)-related immune signaling, which is required for M117-mediated root elongation”
Claim · model-written summary
M117 directly degrades SA and thereby reduces SA levels in the roots.
Not reportedTaxonComparator
Verbatim
e0“M117 can directly degrade SA, thereby reducing SA levels in the roots”
Claim · model-written summary
Integrated omics revealed multiple SA hydrolytic pathways in M117.
- Outcome
- multiple SA hydrolytic pathwayse0
Not reportedTaxon
Verbatim
e0“Integrated omics reveal the presence of multiple SA hydrolytic pathways in M117”
Claim · model-written summary
The NagGHAaAb pathway of M117 is strongly induced by SA.
Not reportedTaxon
Verbatim
e0“Among them, the NagGHAaAb pathway is strongly induced by SA”
Claim · model-written summary
The NagGHAaAb pathway regulates root growth.
Not reportedTaxon
Verbatim
e0“the NagGHAaAb pathway is strongly induced by SA. This pathway regulates root growth”
Claim · model-written summary
The NagGHAaAb pathway is nonrandomly distributed across Massilia species.
- Outcome
- nonrandomly distributed across Massilia speciese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This pathway regulates root growth and is nonrandomly distributed across Massilia species”
Claim · model-written summary
M117 colonization enriches specific bacterial taxa within roots.
- Treatment
- M117 colonizatione0
- Interactor
- M117e0symbiont
- Outcome
- specific bacterial taxa within rootse0
- Direction
- enrichese0
Not reportedTaxonComparator
Verbatim
e0“M117 colonization enriches specific bacterial taxa within roots”