Abstract
Microbial volatile metabolites can enhance plant growth, yet the mechanisms by which plants perceive and transduce these signals are unknown. Growth of Arabidopsis thaliana Col-0 seedlings was found to be stimulated by volatiles from the soil bacterium Streptomyces coelicolor. To investigate volatile-responding candidate signaling molecules and genes, cultivation of seedlings in gas-phase contact with S. coelicolor genotypes was combined with GC-MS and plant transcriptomics. Components potentially involved were further studied using pure compounds and A. thaliana T-DNA mutants. Application of volatiles from S. coelicolor enhanced the growth of A. thaliana seedlings primarily by stimulating lateral root growth rate and inhibiting primary root extension. Concurrently, a family-wide induction of the Kelch-repeat F-box gene family KISS ME DEADLY (KMD) was observed. A. thaliana genotypes with a loss of function for the KMD family or other alterations of auxin/cytokinin signaling homeostasis suppressed the root response to both S. coelicolor total volatiles and the common microbial volatile 3-octanone. The results reveal a novel function of KMDs in mediating plant growth stimulation in response to volatile stimulation that alters auxin/cytokinin signaling and emphasize rhizospheric microbials as potential indicators of soil status to plants.
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Claims 6
Claim · model-written summary
Streptomyces volatiles stimulated Arabidopsis seedling growth.
- Taxon
- Arabidopsis thaliana
Arabidopsis thalianae0 - Treatment
- volatiles from the soil bacterium Streptomyces coelicolore0
- Interactor
- Streptomyces coelicolor
Streptomyces coelicolore0symbiont - Outcome
- Growthe0
- Direction
- stimulatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Growth of Arabidopsis thaliana Col-0 seedlings was found to be stimulated by volatiles from the soil bacterium Streptomyces coelicolor.”
Claim · model-written summary
Streptomyces volatiles stimulated lateral root growth rate.
- Taxon
- A. thalianaArabidopsis thalianae0
- Treatment
- volatiles from S. coelicolore0
- Interactor
- S. coelicolorStreptomyces coelicolore0symbiont
- Outcome
- lateral root growth ratee0
- Direction
- stimulatinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of volatiles from S. coelicolor enhanced the growth of A. thaliana seedlings primarily by stimulating lateral root growth rate and inhibiting primary root extension.”
Claim · model-written summary
Streptomyces volatiles inhibited primary root extension.
- Taxon
- A. thalianaArabidopsis thalianae0
- Treatment
- volatiles from S. coelicolore0
- Interactor
- S. coelicolorStreptomyces coelicolore0symbiont
- Outcome
- primary root extensione0
- Direction
- inhibitinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of volatiles from S. coelicolor enhanced the growth of A. thaliana seedlings primarily by stimulating lateral root growth rate and inhibiting primary root extension.”
Claim · model-written summary
KMD gene family expression was induced by volatile exposure.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Treatment
- Streptomyces Volatilest0
- Gene
- KISS ME DEADLY (KMD)e0
- Outcome
- family-wide inductione0
- Direction
- inductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a family-wide induction of the Kelch-repeat F-box gene family KISS ME DEADLY (KMD) was observed.”
t0“Streptomyces Volatiles Alter Auxin/Cytokinin Signaling, Root Architecture, and Growth Rate in Arabidopsis thaliana via Signaling Through the KISS ME DEADLY Gene Family”
Claim · model-written summary
KMD loss of function or altered auxin/cytokinin homeostasis suppressed the root response to bacterial volatiles and 3-octanone.
- Taxon
- A. thalianaArabidopsis thalianae0
- Treatment
- loss of function for the KMD familye0
- Interactor
- S. coelicolorStreptomyces coelicolore0symbiont
- Gene
- KMDe0
- Outcome
- root responsee0
- Direction
- suppressede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A. thaliana genotypes with a loss of function for the KMD family or other alterations of auxin/cytokinin signaling homeostasis suppressed the root response to both S. coelicolor total volatiles and the common microbial volatile 3-octanone.”
Claim · model-written summary
The authors infer KMD involvement in growth stimulation by volatiles through auxin/cytokinin signaling.
Verbatim
e0“KMDs in mediating plant growth stimulation in response to volatile stimulation that alters auxin/cytokinin signaling”