Abstract
Serratia proteamaculans 1‐102 (1‐102) promotes soybean–bradyrhizobia nodulation and growth, but the mechanism is unknown. After adding isoflavonoid inducers to 1‐102 culture, an active peak with a retention time of about 105 min in the HPLC fractionation was isolated using a bioassay based on the stimulation of soybean seed germination. The plant growth‐promoting activity of this material was compared with 1‐102 culture (cells) and supernatant under greenhouse conditions. The activator was applied to roots in 83, 830 and 8300 HPLC microvolts (μV) per seedling when plants were inoculated with bradyrhizobia or sprayed onto the leaves in same concentrations at 20 d after inoculation. The root‐applied activator, especially at 1 ml of 830 μV per seedling, enhanced soybean nodulation and growth at the same level as 1‐102 culture under both optimal and sub‐optimal root zone temperatures. Thus, this activator stimulating soybean seed germination is also responsible for the plant growth‐promoting activity of 1‐102 culture. However, when sprayed onto the leaves, the activator did not increase growth and in higher concentrations decreased average single leaf area. The results suggest that this inducible activator might be a lipo‐chitooligosaccharide (LCO) analogue. LCOs act as rhizobia‐to‐legume signals stimulating root nodule formation. The activator could provide additional ‘signal’, increasing in the signal quality (the signal‐to‐noise ratio, SNR) of the plant–rhizobia signal exchange process.
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Claims 6
Claim · model-written summary
The inducible activator stimulated soybean seed germination.
- Taxon
- soybean
Glycine maxe2 - Treatment
- this activatore2
- Outcome
- seed germinatione2
- Direction
- stimulatinge2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“this activator stimulating soybean seed germination is also responsible for the plant growth‐promoting activity of 1‐102 culture”
Claim · model-written summary
An active peak with a retention time of about 105 min was isolated from Serratia proteamaculans 1-102 culture amended with isoflavonoid inducers, using a soybean seed germination bioassay.
- Taxon
- soybeanGlycine maxe0
- Interactor
- Serratia proteamaculans 1‐102Serratia proteamaculanse0symbiont
- Outcome
- active peake1
- Value
- about 105 mine1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Serratia proteamaculans 1‐102 (1‐102) promotes soybean–bradyrhizobia nodulation and growth”
e1“After adding isoflavonoid inducers to 1‐102 culture, an active peak with a retention time of about 105 min in the HPLC fractionation was isolated using a bioassay based on the stimulation of soybean seed germination”
Claim · model-written summary
Root-applied activator enhanced soybean nodulation and growth to the same level as 1-102 culture under optimal and sub-optimal root zone temperatures.
- Taxon
- soybeanGlycine maxe3
- Treatment
- root‐applied activatore3
- Interactor
- bradyrhizobiae0symbiont
- Outcome
- nodulation and growthe3
- Direction
- enhancede3
- Qualifier
- under both optimal and sub‐optimal root zone temperaturese3
- Comparator
- 1‐102 culturee3
- Setting
- greenhouse conditionse4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Serratia proteamaculans 1‐102 (1‐102) promotes soybean–bradyrhizobia nodulation and growth”
e3“The root‐applied activator, especially at 1 ml of 830 μV per seedling, enhanced soybean nodulation and growth at the same level as 1‐102 culture under both optimal and sub‐optimal root zone temperatures”
e4“The plant growth‐promoting activity of this material was compared with 1‐102 culture (cells) and supernatant under greenhouse conditions”
Claim · model-written summary
Activator sprayed onto the leaves did not increase soybean growth.
- Taxon
- soybeanGlycine maxe0
- Treatment
- sprayed onto the leavese5
- Outcome
- growthe5
- Direction
- did not increasee5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Serratia proteamaculans 1‐102 (1‐102) promotes soybean–bradyrhizobia nodulation and growth”
e5“However, when sprayed onto the leaves, the activator did not increase growth and in higher concentrations decreased average single leaf area”
Claim · model-written summary
Higher concentrations of the activator sprayed onto soybean leaves decreased average single leaf area.
- Taxon
- soybeanGlycine maxe0
- Treatment
- higher concentrationse5
- Outcome
- average single leaf areae5
- Direction
- decreasede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Serratia proteamaculans 1‐102 (1‐102) promotes soybean–bradyrhizobia nodulation and growth”
e5“However, when sprayed onto the leaves, the activator did not increase growth and in higher concentrations decreased average single leaf area”
Claim · model-written summary
The inducible activator might be a lipo-chitooligosaccharide (LCO) analogue that increases the signal quality of plant-rhizobia signal exchange.
- Taxon
- soybeanGlycine maxe0
- Compound
- lipo‐chitooligosaccharide (LCO)e6
- Outcome
- signal qualitye7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Serratia proteamaculans 1‐102 (1‐102) promotes soybean–bradyrhizobia nodulation and growth”
e6“The results suggest that this inducible activator might be a lipo‐chitooligosaccharide (LCO) analogue”
e7“increasing in the signal quality (the signal‐to‐noise ratio, SNR) of the plant–rhizobia signal exchange process”
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application · growth · Glycine max (soybean)Positive and negative results
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See all 207 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.