Abstract
This study was undertaken to isolate and characterize plant growth promoting bacteria (PGPB) occurring in four soils of Zanzibar, Tanzania as well as to evaluate their potential use as biofertilizers for rice. A total of 12 PGPB strains were isolated from rice and studied for growth characteristics, carbon/nitrogen source utilization patterns using QTS-24 kits, phosphate solubilization, indole acetic acid (IAA) production, antibiotic resistance patterns and growth at different pH, temperature and salt concentrations. All the isolates were motile and gram negative except Z3-4. Acetylene reduction activity was detected in all isolates ranging from 5.9-76.4 nmole C2H2 reduced/h x mg protein while 9 isolates produced IAA ranged from 20-90.8 mg/l. Most of the isolates showed resistance against different environmental stresses like 10-40 degrees C temperature, 0.2-1 M salt concentration and 4-8.5 pH range. Only one isolate Z2-7 formed clear zones on Pikovskaia's medium showing its ability to solubilize phosphates. Z3-2 was used to develop fluorescent antibodies to check the cross reactivity of the isolates. Inoculation of these bacterial isolates resulted in higher plant biomass, root area, and total N and P contents on Tanzanian rice variety BKN PRAT3036B under controlled conditions. Bacillus sp. Z3-4 and Azospirillum sp. Z3-1 are effective strains and, after further testing under field conditions, can be used for inoculum production of rice in Tanzania. The plant growth promoting effects of these PGPRs suggest that these can be exploited to improve crop productivity of rice in Tanzania.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. 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 10
Claim · model-written summary
Twelve plant growth promoting bacterial strains were isolated from rice.
- Taxon
- rice
Oryza sativae0 - Outcome
- PGPB strains were isolatede0
- Value
- 12 PGPB strainse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A total of 12 PGPB strains were isolated from rice”
Claim · model-written summary
All isolates except Z3-4 were motile and gram negative.
- Taxon
- riceOryza sativat0
- Interactor
- isolatese0other
- Outcome
- motile and gram negative except Z3-4e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“All the isolates were motile and gram negative except Z3-4”
t0“rice”
Claim · model-written summary
All isolates showed acetylene reduction activity ranging from 5.9 to 76.4 nmole C2H2 reduced/h x mg protein.
- Taxon
- riceOryza sativat0
- Interactor
- isolatese0other
- Outcome
- Acetylene reduction activitye0
- Value
- 5.9-76.4 nmole C2H2 reduced/h x mg proteine0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Acetylene reduction activity was detected in all isolates ranging from 5.9-76.4 nmole C2H2 reduced/h x mg protein”
t0“rice”
Claim · model-written summary
Nine isolates produced IAA at 20-90.8 mg/l.
- Taxon
- riceOryza sativat0
- Interactor
- isolatese0other
- Outcome
- IAAe0
- Value
- 20-90.8 mg/le0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“9 isolates produced IAA ranged from 20-90.8 mg/l”
t0“rice”
Claim · model-written summary
Most isolates tolerated the stated temperature, salt and pH ranges.
- Taxon
- riceOryza sativat0
- Interactor
- isolatese0other
- Outcome
- resistance against different environmental stressese0
- Qualifier
- 10-40 degrees C temperature, 0.2-1 M salt concentration and 4-8.5 pH rangee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Most of the isolates showed resistance against different environmental stresses like 10-40 degrees C temperature, 0.2-1 M salt concentration and 4-8.5 pH range”
t0“rice”
Claim · model-written summary
Only Z2-7 solubilized phosphates.
- Taxon
- riceOryza sativat0
- Interactor
- Z2-7e0other
- Outcome
- ability to solubilize phosphatese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Only one isolate Z2-7 formed clear zones on Pikovskaia's medium showing its ability to solubilize phosphates”
t0“rice”
Claim · model-written summary
Bacterial inoculation raised rice plant biomass and root area.
- Taxon
- riceOryza sativae0
- Material
- BKN PRAT3036Be0
- Treatment
- Inoculation of these bacterial isolatese0
- Interactor
- bacterial isolatese0symbiont
- Outcome
- plant biomass, root areae0
- Direction
- highere0
- Setting
- controlled conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Inoculation of these bacterial isolates resulted in higher plant biomass, root area, and total N and P contents on Tanzanian rice variety BKN PRAT3036B under controlled conditions.”
Claim · model-written summary
Bacterial inoculation raised total N and P contents in rice.
- Taxon
- riceOryza sativae0
- Material
- BKN PRAT3036Be0
- Treatment
- Inoculation of these bacterial isolatese0
- Interactor
- bacterial isolatese0symbiont
- Outcome
- total N and P contentse0
- Direction
- highere0
- Setting
- controlled conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Inoculation of these bacterial isolates resulted in higher plant biomass, root area, and total N and P contents on Tanzanian rice variety BKN PRAT3036B under controlled conditions.”
Claim · model-written summary
Bacillus sp. Z3-4 was identified as an effective strain for possible rice inoculum production after field testing.
- Taxon
- riceOryza sativae0
- Interactor
- Bacillus sp. Z3-4Bacillus sp. Z3-4e0symbiont
- Outcome
- inoculum production of ricee0
- Qualifier
- after further testing under field conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Bacillus sp. Z3-4 and Azospirillum sp. Z3-1 are effective strains and, after further testing under field conditions, can be used for inoculum production of rice in Tanzania.”
Claim · model-written summary
Azospirillum sp. Z3-1 was identified as an effective strain for possible rice inoculum production after field testing.
- Taxon
- riceOryza sativae0
- Interactor
- Azospirillum sp. Z3-1e0symbiont
- Outcome
- inoculum production of ricee0
- Qualifier
- after further testing under field conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Bacillus sp. Z3-4 and Azospirillum sp. Z3-1 are effective strains and, after further testing under field conditions, can be used for inoculum production of rice in Tanzania.”
The same questions in other 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 →inoculation · growth · Oryza sativa (rice)Positive and negative results
361 papers in the same direction as this paper · 34 in the opposite direction · 3 reporting no difference from an alternative
- positive
- no effect
- negative
395 papers more in this group
See all 399 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.