Abstract
Phosphate solubilizing bacteria (PSB) are promising candidates for microbiological treatment to improve phosphorus-deficient or P-deficient soil. We have experimentally studied the growth promoting effects of PSBs on rice in P-deficient conditions. The 6 PSBs isolated from rhizosphere soil were identified by 16S rDNA sequencing as Enterobacter asburiae 30FPSSB1, E. mori NTTC11, Priestia aryabhattai KNB6, P. aryabhattai 49KNA2, P. megaterium 65KNA2, and Bacillus sp. 38DFWA. They exhibited plant growth promoting traits via phosphate solubilization and indole acetic acid (IAA) production respectively ranging within 32 - 42 mg/L and 5.3 - 340 mg/L. All the strains produced a large amount of siderophores, and some presented a broad range of antifungal activities reducing the growth of phytopathogens by 10 - 35 %. The effects of bacterial population on rice rhizosphere were evaluated on nutrient agar. Rhizobacterial treatments at high 105 - 108 CFU/mL concentrations inhibited plant growth in IAA dose dependent manner, but such effect diminished at low bacterial titers. The capacity of rhizobacteria to promote plant development under scarcity of P was investigated in pot experiments. Under axenic conditions, Bacillus and Priestia species promoted plant growth, whereas Enterobacter species suppressed it. Plants treated with Bacillus sp. 38DFWA, P. aryabhattai KNB6, and P. megaterium 65KNA2 had increased biomasses of shoots (by 33, 26 and 23 %, respectively) and roots (by 34, 48 and 48 %), which facilitated P availability and increased nutrient uptake in the plant tissues by 89, 96 and 143 %, when the inoculated plants were cultivated in insoluble P (tri-calcium phosphate, TCP) medium. In available P and TCP soil treatments, P. aryabhattai KNB6 and E. mori NTTC11 greatly increased rice plant biomass and gave the highest P accumulation in plant tissues. Interestingly, P. aryabhattai KNB6 strongly increased P uptake in plant tissue by 121 % and promoted rice growth by 22 % in P-deficient soil. This clearly demonstrates that P. aryabhattai KNB6 has great potential for use as a bio-inoculant, and is an attractive alternative to phosphate fertilizers. HIGHLIGHTS In this paper, we report on the potential use of phosphate-solubilizing bacteria as bio-fertilizers in P-deficient soils. The isolated strains of phosphate solubilizing bacteria displayed plant growth promoting traits. Some strains effectively promoted the growth of rice plants cultivated in vitro under restricted available phosphorus (P), increasing shoot and root masses respectively by 23 - 33 and 34 - 48 %, and increasing the accumulation of P in plant tissues by 89 - 143 %. In treatment of soil deficient in P, soluble P, or insoluble P, P. aryabhattai strain KNB6 effectively stimulated plant growth with respective increases by 22, 63 and 128 % compared to the control, through increasing P solubility, P uptake, and promotion of root development. GRAPHICAL ABSTRACT
Abstract from the paper’s OpenAlex record; open copy licensed cc-by-nc-nd. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 20
Claim · model-written summary
The isolated bacteria solubilized phosphate at 32 - 42 mg/L.
- Taxon
- Rice
Oryza sativat0 - Outcome
- phosphate solubilizatione0
- Value
- 32 - 42 mg/Le0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“They exhibited plant growth promoting traits via phosphate solubilization and indole acetic acid (IAA) production respectively ranging within 32 - 42 mg/L and 5.3 - 340 mg/L”
t0“Rice”
Claim · model-written summary
The bacteria produced indole acetic acid at 5.3 - 340 mg/L.
- Taxon
- RiceOryza sativat0
- Outcome
- indole acetic acid (IAA) productione0
- Value
- 5.3 - 340 mg/Le0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“indole acetic acid (IAA) production respectively ranging within 32 - 42 mg/L and 5.3 - 340 mg/L”
t0“Rice”
Claim · model-written summary
All strains produced large amounts of siderophores.
- Taxon
- RiceOryza sativat0
- Outcome
- a large amount of siderophorese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“All the strains produced a large amount of siderophores”
t0“Rice”
Claim · model-written summary
Some bacterial strains reduced phytopathogen growth by 10 - 35 %.
- Taxon
- RiceOryza sativat0
- Outcome
- growth of phytopathogense0
- Direction
- reducinge0
- Value
- 10 - 35 %e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“some presented a broad range of antifungal activities reducing the growth of phytopathogens by 10 - 35 %”
t0“Rice”
Claim · model-written summary
High rhizobacterial concentrations inhibited rice growth, with an IAA dose dependence.
- Taxon
- RiceOryza sativat0
- Treatment
- Rhizobacterial treatments at high 105 - 108 CFU/mL concentrationse0
- Outcome
- plant growthe0
- Direction
- inhibitede0
- Comparator
- low bacterial titerse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rhizobacterial treatments at high 105 - 108 CFU/mL concentrations inhibited plant growth in IAA dose dependent manner, but such effect diminished at low bacterial titers.”
t0“Rice”
Claim · model-written summary
Bacillus and Priestia promoted rice growth under axenic conditions.
- Taxon
- RiceOryza sativat0
- Treatment
- Bacillus and Priestia speciese0
- Interactor
- Bacillus and Priestia speciese0symbiont
- Outcome
- plant growthe0
- Direction
- promotede0
- Setting
- axenic conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under axenic conditions, Bacillus and Priestia species promoted plant growth, whereas Enterobacter species suppressed it.”
t0“Rice”
Claim · model-written summary
Enterobacter suppressed rice growth under axenic conditions.
- Taxon
- RiceOryza sativat0
- Treatment
- Enterobacter speciese0
- Interactor
- Enterobacter species
Enterobactere0symbiont - Outcome
- plant growthe0
- Direction
- suppressede0
- Setting
- axenic conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under axenic conditions, Bacillus and Priestia species promoted plant growth, whereas Enterobacter species suppressed it.”
t0“Rice”
Claim · model-written summary
Bacillus sp. 38DFWA increased shoot biomass by 33 %.
- Taxon
- RiceOryza sativat0
- Treatment
- Bacillus sp. 38DFWAe0
- Interactor
- Bacillus sp. 38DFWAe0symbiont
- Outcome
- biomasses of shootse0
- Direction
- increasede0
- Value
- 33e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants treated with Bacillus sp. 38DFWA, P. aryabhattai KNB6, and P. megaterium 65KNA2 had increased biomasses of shoots (by 33, 26 and 23 %, respectively) and roots (by 34, 48 and 48 %)”
t0“Rice”
Claim · model-written summary
P. aryabhattai KNB6 increased shoot biomass by 26 %.
- Taxon
- RiceOryza sativat0
- Treatment
- P. aryabhattai KNB6e0
- Interactor
- P. aryabhattai KNB6Priestia aryabhattaie0symbiont
- Outcome
- biomasses of shootse0
- Direction
- increasede0
- Value
- 26e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants treated with Bacillus sp. 38DFWA, P. aryabhattai KNB6, and P. megaterium 65KNA2 had increased biomasses of shoots (by 33, 26 and 23 %, respectively)”
t0“Rice”
Claim · model-written summary
P. megaterium 65KNA2 increased shoot biomass by 23 %.
- Taxon
- RiceOryza sativat0
- Treatment
- P. megaterium 65KNA2e0
- Interactor
- P. megaterium 65KNA2
Priestia megateriume0symbiont - Outcome
- biomasses of shootse0
- Direction
- increasede0
- Value
- 23e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“P. megaterium 65KNA2 had increased biomasses of shoots (by 33, 26 and 23 %, respectively)”
t0“Rice”
Claim · model-written summary
Bacillus sp. 38DFWA increased root biomass by 34 %.
- Taxon
- RiceOryza sativat0
- Treatment
- Bacillus sp. 38DFWAe0
- Interactor
- Bacillus sp. 38DFWAe0symbiont
- Outcome
- rootse0
- Direction
- increasede0
- Value
- 34e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants treated with Bacillus sp. 38DFWA, P. aryabhattai KNB6, and P. megaterium 65KNA2 had increased biomasses of shoots (by 33, 26 and 23 %, respectively) and roots (by 34, 48 and 48 %)”
t0“Rice”
Claim · model-written summary
P. aryabhattai KNB6 increased root biomass by 48 %.
- Taxon
- RiceOryza sativat0
- Treatment
- P. aryabhattai KNB6e0
- Interactor
- P. aryabhattai KNB6Priestia aryabhattaie0symbiont
- Outcome
- rootse0
- Direction
- increasede0
- Value
- 48e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants treated with Bacillus sp. 38DFWA, P. aryabhattai KNB6, and P. megaterium 65KNA2 had increased biomasses of shoots (by 33, 26 and 23 %, respectively) and roots (by 34, 48 and 48 %)”
t0“Rice”
Claim · model-written summary
P. megaterium 65KNA2 increased root biomass by 48 %.
- Taxon
- RiceOryza sativat0
- Treatment
- P. megaterium 65KNA2e0
- Interactor
- P. megaterium 65KNA2Priestia megateriume0symbiont
- Outcome
- rootse0
- Direction
- increasede0
- Value
- 48e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants treated with Bacillus sp. 38DFWA, P. aryabhattai KNB6, and P. megaterium 65KNA2 had increased biomasses of shoots (by 33, 26 and 23 %, respectively) and roots (by 34, 48 and 48 %)”
t0“Rice”
Claim · model-written summary
The inoculated plants increased tissue nutrient uptake by 89, 96 and 143 %, respectively.
- Taxon
- RiceOryza sativat0
- Treatment
- inoculated plantse0
- Outcome
- nutrient uptake in the plant tissuese0
- Direction
- increasede0
- Value
- 89, 96 and 143 %e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased nutrient uptake in the plant tissues by 89, 96 and 143 %, when the inoculated plants were cultivated in insoluble P (tri-calcium phosphate, TCP) medium”
t0“Rice”
Claim · model-written summary
P. aryabhattai KNB6 and E. mori NTTC11 increased rice biomass and P accumulation in available P and TCP soil.
- Taxon
- riceOryza sativae0
- Treatment
- P. aryabhattai KNB6 and E. mori NTTC11e0
- Outcome
- rice plant biomass and gave the highest P accumulatione0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In available P and TCP soil treatments, P. aryabhattai KNB6 and E. mori NTTC11 greatly increased rice plant biomass and gave the highest P accumulation in plant tissues.”
Claim · model-written summary
P. aryabhattai KNB6 increased P uptake by 121 % in deficient soil.
- Taxon
- riceOryza sativae0
- Treatment
- P. aryabhattai KNB6e0
- Interactor
- P. aryabhattai KNB6Priestia aryabhattaie0symbiont
- Outcome
- P uptake in plant tissuee0
- Direction
- increasede0
- Value
- 121 %e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“P. aryabhattai KNB6 strongly increased P uptake in plant tissue by 121 % and promoted rice growth by 22 % in P-deficient soil.”
Claim · model-written summary
P. aryabhattai KNB6 promoted rice growth by 22 % in deficient soil.
- Taxon
- riceOryza sativae0
- Treatment
- P. aryabhattai KNB6e0
- Interactor
- P. aryabhattai KNB6Priestia aryabhattaie0symbiont
- Outcome
- rice growthe0
- Direction
- promotede0
- Value
- 22 %e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“P. aryabhattai KNB6 strongly increased P uptake in plant tissue by 121 % and promoted rice growth by 22 % in P-deficient soil.”
Claim · model-written summary
P. aryabhattai KNB6 increased growth by 63 % in soluble P soil.
- Taxon
- RiceOryza sativat0
- Treatment
- P. aryabhattai strain KNB6e0
- Outcome
- plant growthe0
- Direction
- increasese0
- Value
- 63e0
- Comparator
- the controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“P. aryabhattai strain KNB6 effectively stimulated plant growth with respective increases by 22, 63 and 128 % compared to the control”
t0“Rice”
Claim · model-written summary
P. aryabhattai KNB6 increased growth by 128 % in insoluble P soil.
- Taxon
- RiceOryza sativat0
- Treatment
- P. aryabhattai strain KNB6e0
- Outcome
- plant growthe0
- Direction
- increasese0
- Value
- 128 %e0
- Comparator
- the controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“P. aryabhattai strain KNB6 effectively stimulated plant growth with respective increases by 22, 63 and 128 % compared to the control”
t0“Rice”
Claim · model-written summary
The authors identify P. aryabhattai KNB6 as a potential bio-inoculant alternative to phosphate fertilizers.
- Taxon
- RiceOryza sativat0
- Outcome
- use as a bio-inoculante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“P. aryabhattai KNB6 has great potential for use as a bio-inoculant, and is an attractive alternative to phosphate fertilizers.”
t0“Rice”
The same questions in other papers
Enterobacter · growth · Oryza sativa (rice)Results differ
3 in the opposite direction
- positive
- positive
- positive
Priestia megaterium · growth · Oryza sativa (rice)Positive and negative results
6 papers in the same direction as this paper · 1 reporting no difference from an alternative
- no effect
- positive
- positive
4 papers more in this group
See all 8 papers →inoculation · nutrient: content · Oryza sativa (rice)Positive and negative results
159 papers in the same direction as this paper · 7 in the opposite direction
- no effect
- negative
- no effect
163 papers more in this group
See all 167 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.