Abstract
Many Gram-negative bacteria communicate by using homoserine lactones (HSLs) as quorum sensing (QS) signals in a cell density-dependent manner. In addition to fatty acyl-HSL (acyl-HSL) signals, certain strains, most of them associated with plants, produce non-canonical aryl-HSLs such as cinnamoyl-HSL. However, the role of aryl-HSL in endophytic associations remained elusive. Bradyrhizobium sp. strain ORS278 possesses a LuxI-LuxR type QS system and produces cinnamoyl-HSL as a QS signal. Here, we report that strain ORS278 promotes growth of domesticated rice (Oryza sativa). QS mutants unable to produce cinnamoyl-HSL exhibited reduced plant-growth promoting activity in comparison to the parent strain ORS278. Likewise, the QS mutants were impaired in their ability to colonize rice roots. These findings suggest that genes controlled by cinnamoyl-HSL play an important role in the association between rice and ORS278. However, biofilm production was not visibly altered in these mutants. In conclusion, our study highlights the importance of aryl-HSLs in endophytic plant-bacteria interactions.
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Claims 5
Claim · model-written summary
ORS278 promotes domesticated rice growth.
- Taxon
- Oryza sativa
Oryza sativae0 - Treatment
- strain ORS278e0
- Interactor
- ORS278e0symbiont
- Outcome
- growthe0
- Direction
- promotese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Here, we report that strain ORS278 promotes growth of domesticated rice (Oryza sativa).”
Claim · model-written summary
Cinnamoyl-HSL-deficient QS mutants had reduced rice growth promotion relative to ORS278.
- Taxon
- riceOryza sativat0
- Treatment
- QS mutants unable to produce cinnamoyl-HSLe0
- Interactor
- QS mutantse0symbiont
- Outcome
- plant-growth promoting activitye0
- Direction
- reducede0
- Comparator
- parent strain ORS278e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“QS mutants unable to produce cinnamoyl-HSL exhibited reduced plant-growth promoting activity in comparison to the parent strain ORS278.”
t0“rice”
Claim · model-written summary
QS mutants were impaired in rice root colonization.
- Taxon
- riceOryza sativae0
- Organ / stage
- rootse0
- Treatment
- QS mutantse0
- Interactor
- QS mutantse0symbiont
- Outcome
- ability to colonize rice rootse0
- Direction
- impairede0
- Comparator
- parent strain ORS278e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Likewise, the QS mutants were impaired in their ability to colonize rice roots.”
e1“in comparison to the parent strain ORS278.”
Claim · model-written summary
Genes controlled by cinnamoyl-HSL appear important in rice association with ORS278.
- Taxon
- riceOryza sativae0
- Interactor
- ORS278e0symbiont
- Compound
- cinnamoyl-HSLe0
- Outcome
- association between rice and ORS278e0
- Qualifier
- genes controlled by cinnamoyl-HSLe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These findings suggest that genes controlled by cinnamoyl-HSL play an important role in the association between rice and ORS278.”
Claim · model-written summary
QS mutants showed no visible alteration of biofilm production.
- Taxon
- Bradyrhizobium sp. strain ORS278
Bradyrhizobium sp.t0 - Treatment
- QS mutants unable to produce cinnamoyl-HSLe1
- Outcome
- biofilm productione0
- Direction
- not visibly alterede0
- Comparator
- parent strain ORS278e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“However, biofilm production was not visibly altered in these mutants.”
e1“QS mutants unable to produce cinnamoyl-HSL exhibited reduced plant-growth promoting activity in comparison to the parent strain ORS278.”
t0“Bradyrhizobium sp. strain ORS278”