Abstract
The test strains Bacteroidetes bacterium (Ba), Pseudomonas fluorescens (Pf) and Variovorax sp. (Va) were selected in advance for their in vitro capability for growth promotion of rapeseed in the presence of increased concentrations of Cd, Cu, Pb and Zn in the medium. In the pot experiment, the strains were used for single Ba, Pf, Va or combined Ba + Pf, Ba + Va, Pf + Va, and Ba + Pf + Va inoculation of B. napus growing in contaminated soil from alluvial deposits. The positive effect of bacterial strains on plant growth was observed in vitro, but was not confirmed in situ in the contaminated soil, where the tested strains inhibited biomass production, rather than stimulating it. However, single inoculation with Ba significantly increased the chlorophyll content and K+ concentration in the leaves. The inoculation of rapeseed with Ba and Va strains was indicated to be the most promising combination for phytoextraction of Cd and Zn from contaminated soil. Combined inoculation with Pf+Va and Pf + Ba+Va significantly decreased the concentration of heavy metals in the roots of rapeseed. We conclude that suitable combinations of PGPR can control the metal uptake of B. napus, selectively increasing either metal extraction or metal stabilization in the rhizosphere and offering promising applications in soil remediation.
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Claims 8
Claim · model-written summary
The tested bacterial strains promoted rapeseed growth in vitro.
- Taxon
- Brassica napus
_Brassica_napus_-_Habit.jpg?width=60)
Brassica napust0 - Outcome
- plant growthe0
- Direction
- positive effecte0
- Setting
- in vitroe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Brassica_napus_-_Habit.jpg?width=500)
Verbatim
e0“The positive effect of bacterial strains on plant growth was observed in vitro”
t0“Brassica napus”
Claim · model-written summary
In contaminated soil the tested strains inhibited biomass production.
- Taxon
- Brassica napusBrassica napust0
- Outcome
- biomass productione0
- Direction
- inhibitede0
- Setting
- contaminated soile0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in situ in the contaminated soil, where the tested strains inhibited biomass production, rather than stimulating it”
t0“Brassica napus”
Claim · model-written summary
Single Ba inoculation significantly increased leaf chlorophyll content.
- Taxon
- Brassica napusBrassica napust0
- Organ / stage
- leavese0
- Treatment
- single inoculation with Bae0
- Interactor
- Bae0symbiont
- Outcome
- chlorophyll contente0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“single inoculation with Ba significantly increased the chlorophyll content and K+ concentration in the leaves”
t0“Brassica napus”
Claim · model-written summary
Single Ba inoculation significantly increased leaf K+ concentration.
- Taxon
- Brassica napusBrassica napust0
- Organ / stage
- leavese0
- Treatment
- single inoculation with Bae0
- Interactor
- Bae0symbiont
- Outcome
- K+ concentratione0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“single inoculation with Ba significantly increased the chlorophyll content and K+ concentration in the leaves”
t0“Brassica napus”
Claim · model-written summary
Ba and Va inoculation was judged most promising for extracting Cd and Zn from contaminated soil.
- Taxon
- Brassica napusBrassica napust0
- Treatment
- inoculation of rapeseed with Ba and Va strainse0
- Interactor
- Bae0symbiont
- Second interactor
- Vae0symbiont
- Outcome
- most promising combination for phytoextraction of Cd and Zne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The inoculation of rapeseed with Ba and Va strains was indicated to be the most promising combination for phytoextraction of Cd and Zn from contaminated soil.”
t0“Brassica napus”
Claim · model-written summary
Pf+Va inoculation significantly decreased root heavy metal concentration.
- Taxon
- Brassica napusBrassica napust0
- Treatment
- Pf+Vae0
- Interactor
- Pfe0symbiont
- Second interactor
- Vae0symbiont
- Outcome
- concentration of heavy metals in the roots of rapeseede0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Combined inoculation with Pf+Va and Pf + Ba+Va significantly decreased the concentration of heavy metals in the roots of rapeseed.”
t0“Brassica napus”
Claim · model-written summary
Pf + Ba+Va inoculation significantly decreased root heavy metal concentration.
- Taxon
- Brassica napusBrassica napust0
- Treatment
- Pf + Ba+Vae0
- Interactor
- Pfe0symbiont
- Second interactor
- Bae0symbiont
- Outcome
- concentration of heavy metals in the roots of rapeseede0
- Direction
- decreasede0
- Qualifier
- Pf + Ba+Vae0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Combined inoculation with Pf+Va and Pf + Ba+Va significantly decreased the concentration of heavy metals in the roots of rapeseed.”
t0“Brassica napus”
Claim · model-written summary
Suitable PGPR combinations can selectively control metal extraction or stabilization.
Verbatim
e0“suitable combinations of PGPR can control the metal uptake of B. napus, selectively increasing either metal extraction or metal stabilization in the rhizosphere”
The same questions in other papers
inoculation · physiology: pigments · Brassica napus (oilseed rape)Results agree
5 papers in the same direction as this paper
- positive
- positive
- positive
2 papers more in this group
See all 6 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.