Abstract
Rhodobacter sphaeroides, a purple non-sulfur photosynthetic bacterium (PNSB), was disrupted by sonication and fractionated by centrifugation into the supernatant and pellet. The effects of the supernatant and pellet on plant growth were examined using Brassica rapa var. perviridis (komatsuna) in the pot experiments. Both fractions showed growth-promoting effects: the supernatant at high concentrations (1 × 107 to 4 × 107 cfu-equivalent mL−1) and the pellet at a low concentration of 2 × 103 cfu-equivalent mL−1). We expected lipopolysaccharide (LPS) to be the active principle of the pellet fraction and examined the effects of LPS on the growth of B. rapa var. perviridis. The growth of the plants was significantly enhanced by the foliar feeding of R. sphaeroides LPS at concentrations ranging from 10 to 100 pg mL−1. The present study is the first report indicating that LPS acts as one of the active principles of the plant-growth-promoting effect of PNSB.
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Claims 4
Claim · model-written summary
The Rhodobacter sphaeroides supernatant promoted komatsuna growth at high concentrations.
- Taxon
- Brassica rapa var. perviridis
Brassica rapa var. perviridise7 - Treatment
- supernatant at high concentrations (1 × 107 to 4 × 107 cfu-equivalent mL−1)e0
- Interactor
- Rhodobacter sphaeroides
Cereibacter sphaeroidese6symbiont - Outcome
- growth-promoting effectse0
- Direction
- growth-promotinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both fractions showed growth-promoting effects: the supernatant at high concentrations (1 × 107 to 4 × 107 cfu-equivalent mL−1)”
e7“Brassica rapa var. perviridis”
e6“Rhodobacter sphaeroides”
Claim · model-written summary
The Rhodobacter sphaeroides pellet promoted komatsuna growth at a low concentration.
- Taxon
- Brassica rapa var. perviridisBrassica rapa var. perviridise7
- Treatment
- pellet at a low concentration of 2 × 103 cfu-equivalent mL−1)e0
- Interactor
- Rhodobacter sphaeroidesCereibacter sphaeroidese6symbiont
- Outcome
- growth-promoting effectse1
- Direction
- growth-promotinge1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the pellet at a low concentration of 2 × 103 cfu-equivalent mL−1)”
e7“Brassica rapa var. perviridis”
e6“Rhodobacter sphaeroides”
e1“growth-promoting effects”
Claim · model-written summary
Foliar feeding with R. sphaeroides LPS at 10 to 100 pg mL−1 significantly enhanced growth.
- Taxon
- B. rapa var. perviridisBrassica rapa var. perviridise1
- Treatment
- foliar feeding of R. sphaeroides LPS at concentrations ranging from 10 to 100 pg mL−1e0
- Interactor
- R. sphaeroidesCereibacter sphaeroidese0symbiont
- Outcome
- growthe0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The growth of the plants was significantly enhanced by the foliar feeding of R. sphaeroides LPS at concentrations ranging from 10 to 100 pg mL−1.”
e1“B. rapa var. perviridis”
Claim · model-written summary
The authors identify LPS as one active principle of the growth-promoting effect of PNSB.
- Taxon
- Brassica rapa var. perviridisBrassica rapa var. perviridise7
- Interactor
- PNSBe0symbiont
- Compound
- LPSe0
- Outcome
- plant-growth-promoting effecte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“LPS acts as one of the active principles of the plant-growth-promoting effect of PNSB.”
e7“Brassica rapa var. perviridis”
The same questions in other papers
micronutrient · growth · Brassica rapa (field mustard)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.