Abstract
Applying microbial biostimulants during crop cultivation allows for higher sustainability levels. It reduces the need for fertilizers and environmental contaminants while enhancing plant quality. This study assessed 13 endophytic bacteria, 4 newly isolated, and 9 donated, for plant growth-promoting capabilities. Quantitative assessments of indole acetic acid (IAA), gibberellic acid (GA3), siderophores, ammonia, exopolysaccharides, volatile HCN, and phosphate solubilization, along with Bray–Curtis cluster analyses were performed. Upon the results we selected RhizobiumMAP7, Brevibacillus DesertYSK, Pseudomonas MAP8, BacillusMAP3, Brevibacillus MAP, and Bacillus DeltaYSK to evaluate their effects on Lactuca sativa growth and pigmentation in a 30-day greenhouse pot experiment. Both Brevibacillus DesertYSK and Rhizobium MAP7surpassed other strains in growth promotional effects. They doubled shoot length (12 and 12.3 cm, respectively, when compared with 7 cm for control after 30 days), and fresh weight (0.079 and 0.084 g, respectively, when compared with 0.045 g for control after 30 days), and increased root length by at least 3-fold when compared with control (4.5 and 3.5 cm, respectively, when compared with 1.2 cm for control after 30 days). Chlorophyll content also exhibited at least a 2-fold significant increase in response to bacterization compared with control. This strain superiority was consistent with the in vitro assays data that showed strains capability as IAA and GA3producers. Also, strains were highly capable ammonia and siderophore producers and phosphate solubilizers, providing considerable hormone and nutrient levels for L. sativa plantsleading to improved growth parameters and appearance. These data support the notion that nodule-based bacteria are potential plant growth-promoting bacteria (PGPB) that may be used on a wider scale rather than just for legumes.
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Claims 10
Claim · model-written summary
Brevibacillus DesertYSK increased shoot length to 12 versus control.
- Taxon
- Lactuca sativa L.
Lactuca sativat0 - Treatment
- Brevibacillus DesertYSKe0
- Interactor
- Brevibacillus DesertYSKe0symbiont
- Outcome
- shoot lengthe0
- Direction
- doublede0
- Value
- 12e0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Lactuca sativa L.”
e0“Both Brevibacillus DesertYSK and Rhizobium MAP7surpassed other strains in growth promotional effects. They doubled shoot length (12 and 12.3 cm, respectively, when compared with 7 cm for control after 30 days), and fresh weight (0.079 and 0.084 g, respectively, when compared with 0.045 g for control after 30 days), and increased root length by at least 3-fold when compared with control (4.5 and 3.5 cm, respectively, when compared with 1.2 cm for control after 30 days)”
Claim · model-written summary
Rhizobium MAP7 increased shoot length to 12.3 cm versus control.
- Taxon
- Lactuca sativa L.Lactuca sativat0
- Treatment
- Rhizobium MAP7e0
- Interactor
- Rhizobium MAP7e0symbiont
- Outcome
- shoot lengthe0
- Direction
- doublede0
- Value
- 12.3 cme0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Lactuca sativa L.”
e0“Both Brevibacillus DesertYSK and Rhizobium MAP7surpassed other strains in growth promotional effects. They doubled shoot length (12 and 12.3 cm, respectively, when compared with 7 cm for control after 30 days), and fresh weight (0.079 and 0.084 g, respectively, when compared with 0.045 g for control after 30 days), and increased root length by at least 3-fold when compared with control (4.5 and 3.5 cm, respectively, when compared with 1.2 cm for control after 30 days)”
Claim · model-written summary
Brevibacillus DesertYSK increased fresh weight to 0.079 versus control.
- Taxon
- Lactuca sativa L.Lactuca sativat0
- Treatment
- Brevibacillus DesertYSKe0
- Interactor
- Brevibacillus DesertYSKe0symbiont
- Outcome
- fresh weighte0
- Direction
- doublede0
- Value
- 0.079e0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Lactuca sativa L.”
e0“Both Brevibacillus DesertYSK and Rhizobium MAP7surpassed other strains in growth promotional effects. They doubled shoot length (12 and 12.3 cm, respectively, when compared with 7 cm for control after 30 days), and fresh weight (0.079 and 0.084 g, respectively, when compared with 0.045 g for control after 30 days), and increased root length by at least 3-fold when compared with control (4.5 and 3.5 cm, respectively, when compared with 1.2 cm for control after 30 days)”
Claim · model-written summary
Rhizobium MAP7 increased fresh weight to 0.084 g versus control.
- Taxon
- Lactuca sativa L.Lactuca sativat0
- Treatment
- Rhizobium MAP7e0
- Interactor
- Rhizobium MAP7e0symbiont
- Outcome
- fresh weighte0
- Direction
- doublede0
- Value
- 0.084 ge0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Lactuca sativa L.”
e0“Both Brevibacillus DesertYSK and Rhizobium MAP7surpassed other strains in growth promotional effects. They doubled shoot length (12 and 12.3 cm, respectively, when compared with 7 cm for control after 30 days), and fresh weight (0.079 and 0.084 g, respectively, when compared with 0.045 g for control after 30 days), and increased root length by at least 3-fold when compared with control (4.5 and 3.5 cm, respectively, when compared with 1.2 cm for control after 30 days)”
Claim · model-written summary
Brevibacillus DesertYSK increased root length to 4.5 versus control.
- Taxon
- Lactuca sativa L.Lactuca sativat0
- Treatment
- Brevibacillus DesertYSKe0
- Interactor
- Brevibacillus DesertYSKe0symbiont
- Outcome
- root lengthe0
- Direction
- doublede0
- Value
- 4.5e0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Lactuca sativa L.”
e0“Both Brevibacillus DesertYSK and Rhizobium MAP7surpassed other strains in growth promotional effects. They doubled shoot length (12 and 12.3 cm, respectively, when compared with 7 cm for control after 30 days), and fresh weight (0.079 and 0.084 g, respectively, when compared with 0.045 g for control after 30 days), and increased root length by at least 3-fold when compared with control (4.5 and 3.5 cm, respectively, when compared with 1.2 cm for control after 30 days)”
Claim · model-written summary
Rhizobium MAP7 increased root length to 3.5 cm versus control.
- Taxon
- Lactuca sativa L.Lactuca sativat0
- Treatment
- Rhizobium MAP7e0
- Interactor
- Rhizobium MAP7e0symbiont
- Outcome
- root lengthe0
- Direction
- doublede0
- Value
- 3.5 cme0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Lactuca sativa L.”
e0“Both Brevibacillus DesertYSK and Rhizobium MAP7surpassed other strains in growth promotional effects. They doubled shoot length (12 and 12.3 cm, respectively, when compared with 7 cm for control after 30 days), and fresh weight (0.079 and 0.084 g, respectively, when compared with 0.045 g for control after 30 days), and increased root length by at least 3-fold when compared with control (4.5 and 3.5 cm, respectively, when compared with 1.2 cm for control after 30 days)”
Claim · model-written summary
Bacterization significantly increased lettuce chlorophyll content at least twofold.
- Taxon
- Lactuca sativa L.Lactuca sativat0
- Treatment
- bacterizatione0
- Outcome
- Chlorophyll contente0
- Direction
- increasee0
- Value
- 2-folde0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Lactuca sativa L.”
e0“Chlorophyll content also exhibited at least a 2-fold significant increase in response to bacterization compared with control”
Claim · model-written summary
The strains produced IAA and GA3 in vitro.
- Taxon
- Lactuca sativa L.Lactuca sativat0
- Interactor
- strainse0symbiont
- Outcome
- IAA and GA3producerse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Lactuca sativa L.”
e0“strains capability as IAA and GA3producers”
Claim · model-written summary
The strains were capable ammonia and siderophore producers and phosphate solubilizers.
- Taxon
- Lactuca sativa L.Lactuca sativat0
- Interactor
- strainse0symbiont
- Outcome
- ammonia and siderophore producers and phosphate solubilizerse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Lactuca sativa L.”
e0“strains were highly capable ammonia and siderophore producers and phosphate solubilizers”
Claim · model-written summary
The authors suggest broader use of nodule-based bacteria as plant growth promoters.
- Taxon
- Lactuca sativa L.Lactuca sativat0
- Outcome
- may be used on a wider scale rather than just for legumese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Lactuca sativa L.”
e0“nodule-based bacteria are potential plant growth-promoting bacteria (PGPB) that may be used on a wider scale rather than just for legumes”
The same questions in other papers
Rhizobium · growth · Lactuca sativa (garden lettuce)Results agree
2 papers in the same direction as this paper
- positive
- positive
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.