Abstract
A metal-resistant bacterial strain SM3 isolated from a serpentine soil in the north-east of Portugal was characterized as Bacillus weihenstephanensis based on the morphological and biochemical characteristics and on the comparative analysis of the partial 16S ribosomal DNA sequence. Bacillus weihenstephanensis SM3 showed a high degree of resistance to nickel (1500 mg l(-1)), copper (500 mg l(-1)) and zinc (700 mg l(-1)) and also to antibiotics (ampicillin, penicillin, kanamycin and streptomycin). Strain SM3 has also exhibited the capability of solubilizing phosphate and producing indole-3-acetic acid (IAA) both in the absence and in the presence of metals (Ni, Cu and Zn). A pot experiment was conducted to elucidate the effects of strain SM3 on plant growth and uptake of Ni, Cu or Zn by Helianthus annuus. Inoculation with strain SM3 increased the shoot and root biomass of H. annuus grown in both non-contaminated and contaminated soil. Furthermore, strain SM3 increased the accumulation of Cu and Zn in the root and shoot systems. A batch experiment was also conducted to assess the metal mobilization potential of strain SM3 in soil. Inoculation with this strain increased the concentrations of water soluble Ni, Cu and Zn in soil. Metal solubilization by this bacterial strain may be an important process to promote the uptake of heavy metals by plants. This study elucidates the multifarious role of strain SM3 in plant growth promotion and its metal mobilizing potential.
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Claims 4
Claim · model-written summary
SM3 inoculation increased sunflower shoot and root biomass in both soil conditions.
- Taxon
- H. annuus
Helianthus annuuse0 - Treatment
- Inoculation with strain SM3e0
- Interactor
- strain SM3e0symbiont
- Outcome
- shoot and root biomasse0
- Direction
- increasede0
- Qualifier
- both non-contaminated and contaminated soile0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Inoculation with strain SM3 increased the shoot and root biomass of H. annuus grown in both non-contaminated and contaminated soil.”
Claim · model-written summary
SM3 increased Cu accumulation in roots and shoots.
- Taxon
- H. annuusHelianthus annuuse1
- Organ / stage
- root and shoot systemse0
- Treatment
- strain SM3e0
- Interactor
- strain SM3e0symbiont
- Outcome
- accumulation of Cue0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“strain SM3 increased the accumulation of Cu and Zn in the root and shoot systems”
e1“Inoculation with strain SM3 increased the shoot and root biomass of H. annuus grown in both non-contaminated and contaminated soil.”
Claim · model-written summary
SM3 increased Zn accumulation in roots and shoots.
- Taxon
- H. annuusHelianthus annuuse1
- Organ / stage
- root and shoot systemse0
- Treatment
- strain SM3e0
- Interactor
- strain SM3e0symbiont
- Outcome
- accumulation of Cu and Zne0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“strain SM3 increased the accumulation of Cu and Zn in the root and shoot systems”
e1“Inoculation with strain SM3 increased the shoot and root biomass of H. annuus grown in both non-contaminated and contaminated soil.”
Claim · model-written summary
SM3 increased water soluble soil Ni, Cu and Zn.
- Taxon
- H. annuusHelianthus annuuse1
- Treatment
- Inoculation with this straine0
- Outcome
- concentrations of water soluble Ni, Cu and Zn in soile0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Inoculation with this strain increased the concentrations of water soluble Ni, Cu and Zn in soil.”
t0“plant‐growth promoting Bacillus weihenstephanensis isolated from serpentine soil in Portugal”
e1“Inoculation with strain SM3 increased the shoot and root biomass of H. annuus grown in both non-contaminated and contaminated soil.”
The same questions in other papers
inoculation · growth · Helianthus annuus (common sunflower)Positive and negative results
53 papers in the same direction as this paper · 7 in the opposite direction · 1 reporting no difference from an alternative
- positive
- positive
- positive
58 papers more in this group
See all 62 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.