Abstract
Abstract Plant growth-promoting rhizobacteria (PGPR) are free-existing soil-borne bacteria that can be used as bioinoculants in place of chemical fertilizers to directly or indirectly enhance plant growth. This study aimed to characterize PGPR native to the rhizosphere of alfalfa plants in Kayseri and evaluate their efficacy on the growth parameters of tomato and watermelon. A total of 56 potential PGPR isolates were isolated and 24 were selected based on their ability to produce multiple PGP traits. 16S rDNA and phylogenetic analysis characterized these isolates to be novel strains of Pseudomonas , Enterobacter , Acinetobacter , Stenotrophomonas , Staphylococcus , Lycinibacillus , and Bacillus . Sequence analysis revealed nucleotide variations and insertion/deletion mutations in their 16S rRNA genes (nucleotides 913–1408). All selected isolates demonstrated nitrogen fixation ability, whereas 54%, 83%, 71%, 54%, and 38% of isolates possessed genes for phosphate solubilization, indole-3-acetic acid (IAA) synthesis, phytase, ACC deaminase, and siderophore, respectively . Fifty-eight day old tomato and watermelon plants grown from PGPR-treated seeds showed significantly higher improvements in plant height, stem diameter, leaf area, shoot dry weight, and root fresh weight compared to non-inoculated control plants. Furthermore, treatment of watermelon seeds with these isolates significantly increased the fresh weight of shoots and the root dry weights in watermelon plants. Thus, these indigenous PGPR isolates can be used as effective seed inoculants and chemical fertilizer alternatives to enhance tomato and watermelon growth.
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Claims 8
Claim · model-written summary
The study selected 24 of 56 potential PGPR isolates for multiple growth-promoting traits.
- Taxon
- alfalfa
Medicago sativat0 - Interactor
- PGPR isolatese0symbiont
- Outcome
- multiple PGP traitse0
- Value
- 24e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A total of 56 potential PGPR isolates were isolated and 24 were selected based on their ability to produce multiple PGP traits.”
t0“alfalfa”
Claim · model-written summary
The selected isolates belonged to seven named bacterial genera.
- Taxon
- alfalfaMedicago sativat0
- Outcome
- novel strains of Pseudomonas , Enterobacter , Acinetobacter , Stenotrophomonas , Staphylococcus , Lycinibacillus , and Bacilluse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“16S rDNA and phylogenetic analysis characterized these isolates to be novel strains of Pseudomonas , Enterobacter , Acinetobacter , Stenotrophomonas , Staphylococcus , Lycinibacillus , and Bacillus .”
t0“alfalfa”
Claim · model-written summary
The isolates had sequence variation in 16S rRNA genes.
- Taxon
- alfalfaMedicago sativat0
- Gene
- 16S rRNA genese0
- Outcome
- nucleotide variations and insertion/deletion mutationse0
- Qualifier
- nucleotides 913–1408e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sequence analysis revealed nucleotide variations and insertion/deletion mutations in their 16S rRNA genes (nucleotides 913–1408).”
t0“alfalfa”
Claim · model-written summary
All selected isolates showed nitrogen fixation ability.
- Taxon
- alfalfaMedicago sativat0
- Interactor
- isolatese0symbiont
- Outcome
- nitrogen fixation abilitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“All selected isolates demonstrated nitrogen fixation ability”
t0“alfalfa”
Claim · model-written summary
The selected isolates carried genes for five growth-promoting functions at different frequencies.
- Taxon
- alfalfaMedicago sativat0
- Outcome
- genes for phosphate solubilization, indole-3-acetic acid (IAA) synthesis, phytase, ACC deaminase, and siderophoree0
- Value
- 54%, 83%, 71%, 54%, and 38%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“54%, 83%, 71%, 54%, and 38% of isolates possessed genes for phosphate solubilization, indole-3-acetic acid (IAA) synthesis, phytase, ACC deaminase, and siderophore, respectively”
t0“alfalfa”
Claim · model-written summary
PGPR treatment improved tomato height, stem diameter, leaf area, shoot dry weight and root fresh weight.
- Taxon
- tomato
Solanum lycopersicume0 - Treatment
- PGPR-treated seedse0
- Interactor
- PGPRe0symbiont
- Outcome
- plant height, stem diameter, leaf area, shoot dry weight, and root fresh weighte0
- Direction
- highere0
- Comparator
- non-inoculated control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fifty-eight day old tomato and watermelon plants grown from PGPR-treated seeds showed significantly higher improvements in plant height, stem diameter, leaf area, shoot dry weight, and root fresh weight compared to non-inoculated control plants.”
Claim · model-written summary
PGPR treatment improved watermelon height, stem diameter, leaf area, shoot dry weight and root fresh weight.
- Taxon
- watermelon
Citrullus lanatuse0 - Treatment
- PGPR-treated seedse0
- Interactor
- PGPRe0symbiont
- Outcome
- plant height, stem diameter, leaf area, shoot dry weight, and root fresh weighte0
- Direction
- highere0
- Comparator
- non-inoculated control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fifty-eight day old tomato and watermelon plants grown from PGPR-treated seeds showed significantly higher improvements in plant height, stem diameter, leaf area, shoot dry weight, and root fresh weight compared to non-inoculated control plants.”
Claim · model-written summary
PGPR seed treatment increased watermelon shoot fresh and root dry weights.
- Taxon
- watermelonCitrullus lanatuse0
- Treatment
- treatment of watermelon seeds with these isolatese0
- Interactor
- isolatese0symbiont
- Outcome
- fresh weight of shoots and the root dry weightse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“treatment of watermelon seeds with these isolates significantly increased the fresh weight of shoots and the root dry weights in watermelon plants.”
The same questions in other papers
inoculation · growth · Citrullus lanatus (watermelon)Positive and negative results
18 papers in the same direction as this paper · 3 in the opposite direction
- negative
- negative
- negative
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See all 22 papers →inoculation · growth · Solanum lycopersicum (tomato)Positive and negative results
386 papers in the same direction as this paper · 53 in the opposite direction · 1 reporting no difference from an alternative
- positive
- no effect
- no effect
437 papers more in this group
See all 441 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.