Abstract
Soil salinity limits crop output on 20% of irrigated land worldwide. Silicon-solubilizing rhizobacteria release plant-available silicon and promote plant growth, thus reducing salt stress in an eco-friendly way. This study examined 32 rhizosphere soil samples from sugarcane fields in Baramati (Pune District, India) for pH (7.0–8.5) and salinity (EC 0.5–4.0 dS/m). On nutritional agar with up to 8% NaCl, 128 halotolerant silicate-solubilizing bacterial (SSB) isolates were isolated. 12 isolates thrived well at 8% NaCl, indicating strong salt tolerance, but 12% NaCl reduced growth. Characterizing eight powerful SSB isolates was done. Bacillus tequilensis, Pseudomonas fluorescens, Rhizobium leguminosarum, and Pseudomonas aeruginosa were identified by 16S rRNA gene sequencing. The eight had calcium carbonate (silicate) solubilization, cellulase and protease activity, and indole-3-acetic acid (IAA) synthesis, but no amylase, siderophore, or phosphate-solubilizing activity. Watermelon (Citrullus lanatus) pot tests showed that salt-tolerant SSB isolate inoculation increased plant growth, yield, and nutrient uptake in salty soil. Inoculated watermelon plants had 15–25% higher fruit output and tissue nitrogen, phosphorus, and potassium than uninoculated controls. These results show that halotolerant SSB may mobilize silicon and provide multiple PGP benefits as bio-inoculants for salt-affected soils to boost crop productivity. Silica-solubilizing bacteria; halotolerance; plant growth enhancement; watermelon; salt stress; biofertilizer
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Claims 8
Claim · model-written summary
Inoculation with a salt-tolerant SSB isolate increased watermelon plant growth, yield and nutrient uptake in salty soil in pot tests.
- Taxon
- Watermelon (Citrullus lanatus)
Citrullus lanatuse1 - Treatment
- salt-tolerant SSB isolate inoculatione1
- Interactor
- salt-tolerant SSB isolatee1symbiont
- Outcome
- plant growth, yield, and nutrient uptakee1
- Direction
- increasede1
- Comparator
- uninoculated controlse2
- Setting
- pot testse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Watermelon (Citrullus lanatus) pot tests showed that salt-tolerant SSB isolate inoculation increased plant growth, yield, and nutrient uptake in salty soil”
e2“Inoculated watermelon plants had 15–25% higher fruit output and tissue nitrogen, phosphorus, and potassium than uninoculated controls”
Claim · model-written summary
Inoculated watermelon plants had 15–25% higher fruit output than uninoculated controls.
- Taxon
- watermelonCitrullus lanatuse2
- Treatment
- salt-tolerant SSB isolate inoculatione1
- Interactor
- salt-tolerant SSB isolatee1symbiont
- Outcome
- fruit outpute2
- Direction
- highere2
- Value
- 15–25%e2
- Comparator
- uninoculated controlse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Watermelon (Citrullus lanatus) pot tests showed that salt-tolerant SSB isolate inoculation increased plant growth, yield, and nutrient uptake in salty soil”
e2“Inoculated watermelon plants had 15–25% higher fruit output and tissue nitrogen, phosphorus, and potassium than uninoculated controls”
Claim · model-written summary
Inoculated watermelon plants had 15–25% higher tissue nitrogen, phosphorus and potassium than uninoculated controls.
- Taxon
- watermelonCitrullus lanatuse2
- Treatment
- salt-tolerant SSB isolate inoculatione1
- Interactor
- salt-tolerant SSB isolatee1symbiont
- Outcome
- tissue nitrogen, phosphorus, and potassiume2
- Direction
- highere2
- Value
- 15–25%e2
- Comparator
- uninoculated controlse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Watermelon (Citrullus lanatus) pot tests showed that salt-tolerant SSB isolate inoculation increased plant growth, yield, and nutrient uptake in salty soil”
e2“Inoculated watermelon plants had 15–25% higher fruit output and tissue nitrogen, phosphorus, and potassium than uninoculated controls”
Claim · model-written summary
The eight sugarcane rhizosphere isolates showed calcium carbonate (silicate) solubilization, cellulase activity and protease activity.
Verbatim
e3“32 rhizosphere soil samples from sugarcane fields”
e4“The eight had calcium carbonate (silicate) solubilization, cellulase and protease activity, and indole-3-acetic acid (IAA) synthesis, but no amylase, siderophore, or phosphate-solubilizing activity”
Claim · model-written summary
The eight sugarcane rhizosphere isolates showed indole-3-acetic acid (IAA) synthesis.
Verbatim
e3“32 rhizosphere soil samples from sugarcane fields”
e4“The eight had calcium carbonate (silicate) solubilization, cellulase and protease activity, and indole-3-acetic acid (IAA) synthesis, but no amylase, siderophore, or phosphate-solubilizing activity”
Claim · model-written summary
The eight sugarcane rhizosphere isolates showed no amylase, siderophore or phosphate-solubilizing activity.
Verbatim
e3“32 rhizosphere soil samples from sugarcane fields”
e4“The eight had calcium carbonate (silicate) solubilization, cellulase and protease activity, and indole-3-acetic acid (IAA) synthesis, but no amylase, siderophore, or phosphate-solubilizing activity”
Claim · model-written summary
12% NaCl reduced growth of the halotolerant SSB isolates.
Not reportedComparator
Verbatim
e3“32 rhizosphere soil samples from sugarcane fields”
e5“12 isolates thrived well at 8% NaCl, indicating strong salt tolerance, but 12% NaCl reduced growth”
Claim · model-written summary
Bacillus tequilensis, Pseudomonas fluorescens, Rhizobium leguminosarum and Pseudomonas aeruginosa were identified from sugarcane rhizosphere isolates by 16S rRNA gene sequencing.
Verbatim
e3“32 rhizosphere soil samples from sugarcane fields”
e6“Bacillus tequilensis, Pseudomonas fluorescens, Rhizobium leguminosarum, and Pseudomonas aeruginosa were identified by 16S rRNA gene sequencing”
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See all 9 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.