Abstract
Although many studies have been conducted to identify the specific traits by which plant growth–promoting rhizobacteria (PGPR) promote plant growth, usually they were limited to studying just one or two of these traits. We selected 116 isolates from bulk soil and the rhizosphere of soybean [ Glycine max (L.) Merr.] and examined them for a wide array of traits that might increase early soybean growth in nonsterile soil (PGPR traits). A subsample of 23 isolates, all but one of which tested positive for one or more of these PGPR traits, was further screened for traits associated with biocontrol, (brady)rhizobial inhibition, and rhizosphere competence. Six of eight isolates positive for 1‐aminocyclopropane‐1‐carboxylate (ACC, a precursor of ethylene) deaminase production, four of seven isolates positive for siderophore production, three of four isolates positive for β‐1,3‐glucanase production, and two of five isolates positive for P solubilization increased at least one aspect of early soybean growth. One isolate, which did not share any of the PGPR traits tested in vitro except antagonism to Sclerotium rolfsii and Sclerotinia sclerotiorum , also promoted soybean growth. One of the 23 isolates changed bradyrhizobial nodule occupancy. Although the presence of a PGPR trait in vitro does not guarantee that a particular isolate is a PGPR, the results suggest that rhizobacteria able to produce ACC deaminase and, to a lesser extent, β‐1,3‐glucanase or siderophores or those able to solubilize P in vitro may increase early soybean growth in nonsterile soil.
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Claims 6
Claim · model-written summary
Six of eight isolates positive for ACC deaminase production increased early soybean growth.
- Taxon
- soybean
Glycine maxe1 - Treatment
- Six of eight isolates positive for 1‐aminocyclopropane‐1‐carboxylate (ACC, a precursor of ethylene) deaminase productione1
- Outcome
- early soybean growthe1
- Direction
- increasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Six of eight isolates positive for 1‐aminocyclopropane‐1‐carboxylate (ACC, a precursor of ethylene) deaminase production, four of seven isolates positive for siderophore production, three of four isolates positive for β‐1,3‐glucanase production, and two of five isolates positive for P solubilization increased at least one aspect of early soybean growth”
Claim · model-written summary
Four of seven isolates positive for siderophore production increased early soybean growth.
- Taxon
- soybeanGlycine maxe1
- Treatment
- four of seven isolates positive for siderophore productione1
- Outcome
- early soybean growthe1
- Direction
- increasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Six of eight isolates positive for 1‐aminocyclopropane‐1‐carboxylate (ACC, a precursor of ethylene) deaminase production, four of seven isolates positive for siderophore production, three of four isolates positive for β‐1,3‐glucanase production, and two of five isolates positive for P solubilization increased at least one aspect of early soybean growth”
Claim · model-written summary
Three of four isolates positive for beta-1,3-glucanase production increased early soybean growth.
- Taxon
- soybeanGlycine maxe1
- Treatment
- three of four isolates positive for β‐1,3‐glucanase productione1
- Outcome
- early soybean growthe1
- Direction
- increasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Six of eight isolates positive for 1‐aminocyclopropane‐1‐carboxylate (ACC, a precursor of ethylene) deaminase production, four of seven isolates positive for siderophore production, three of four isolates positive for β‐1,3‐glucanase production, and two of five isolates positive for P solubilization increased at least one aspect of early soybean growth”
Claim · model-written summary
Two of five isolates positive for P solubilization increased early soybean growth.
- Taxon
- soybeanGlycine maxe1
- Treatment
- two of five isolates positive for P solubilizatione1
- Outcome
- early soybean growthe1
- Direction
- increasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Six of eight isolates positive for 1‐aminocyclopropane‐1‐carboxylate (ACC, a precursor of ethylene) deaminase production, four of seven isolates positive for siderophore production, three of four isolates positive for β‐1,3‐glucanase production, and two of five isolates positive for P solubilization increased at least one aspect of early soybean growth”
Claim · model-written summary
One isolate without the in vitro PGPR traits, except antagonism to Sclerotium rolfsii and Sclerotinia sclerotiorum, also promoted soybean growth.
- Taxon
- soybeanGlycine maxe2
- Treatment
- One isolatee2
- Outcome
- soybean growthe2
- Direction
- promotede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“One isolate, which did not share any of the PGPR traits tested in vitro except antagonism to Sclerotium rolfsii and Sclerotinia sclerotiorum , also promoted soybean growth”
Claim · model-written summary
One of the 23 isolates changed bradyrhizobial nodule occupancy in soybean.
- Taxon
- soybeanGlycine maxt1
- Treatment
- One of the 23 isolatese3
- Interactor
- bradyrhizobiale3other
- Outcome
- bradyrhizobial nodule occupancye3
- Direction
- changede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t1“Early Soybean Growth”
e3“One of the 23 isolates changed bradyrhizobial nodule occupancy”
The same questions in other papers
1-aminocyclopropanecarboxylic acid · growth · Glycine max (soybean)Positive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction
- no effect
- positive
- positive
ethene · growth · Glycine max (soybean)Positive and negative results
4 in the opposite direction
- negative
- negative
- negative
1 paper more in this group
See all 5 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.