Abstract
The development of plant-growth-promoting bacteria (PGPB) is one of the important research topics in agricultural microbiology. Four bacterial isolates that exhibited nitrogen fixation, phosphate and potassium solubilization, as well as indole-3-acetic acid (IAA) and siderophore production abilities, were selected from biogas residue, namely BR-1, BR-16, BR-17, and BR-44. According to morphological and molecular biological identification, BR-1, BR-16, BR-17, and BR-44 belonged to Bacillus subtilis, Bacillus cereus, Bacillus megaterium, and Bacillus subtilis, respectively. The four functional strains were combined into a composite microbial community. The optimal media were peptone (15 g/L), sucrose (10 g/L), and KCl (2 g/L); the optimal incubation conditions were an initial pH of 7.0, a volume of 47 mL/250 mL, an inoculum size of 6% v/v, an incubation temperature of 31 °C, a shaking speed of 205 r/min, and an incubation period of 20 h, as determined through a single factor test and the response surface methodology (RSM). In the optimized process, a liquid bacterial inoculant with an OD600 of 1.866 was obtained, with an effective viable count of 8.955 × 109 CFU/mL. A solid bacterial inoculant was prepared by using bran as a substrate, and its effective viable count was 1.11 × 109 CFU/g. The application of the bacterial inoculants promoted the growth of watermelon, increased the photosynthetic efficiency and yield, and improved fruit quality. This study provides a theoretical basis and technical support for the development and application of microbial inoculants.
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Claims 10
Claim · model-written summary
Four bacterial isolates from biogas residue had nitrogen fixation, phosphate and potassium solubilization, IAA and siderophore production abilities.
- Taxon
- Watermelon
Citrullus lanatust0 - Interactor
- bacterial isolatese0
- Outcome
- nitrogen fixation, phosphate and potassium solubilization, as well as indole-3-acetic acid (IAA) and siderophore production abilitiese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Watermelon”
e0“Four bacterial isolates that exhibited nitrogen fixation, phosphate and potassium solubilization, as well as indole-3-acetic acid (IAA) and siderophore production abilities, were selected from biogas residue, namely BR-1, BR-16, BR-17, and BR-44”
Claim · model-written summary
BR-1 and BR-44 were identified as Bacillus subtilis.
- Taxon
- WatermelonCitrullus lanatust0
- Interactor
- Bacillus subtilis
Bacillus subtilise0symbiont - Outcome
- belonged to Bacillus subtilise0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Watermelon”
e0“BR-1, BR-16, BR-17, and BR-44 belonged to Bacillus subtilis, Bacillus cereus, Bacillus megaterium, and Bacillus subtilis, respectively”
Claim · model-written summary
BR-16 was identified as Bacillus cereus.
- Taxon
- WatermelonCitrullus lanatust0
- Interactor
- Bacillus cereus
Bacillus cereuse0symbiont - Outcome
- Bacillus cereuse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Watermelon”
e0“BR-1, BR-16, BR-17, and BR-44 belonged to Bacillus subtilis, Bacillus cereus, Bacillus megaterium, and Bacillus subtilis, respectively”
Claim · model-written summary
BR-17 was identified as Bacillus megaterium.
- Taxon
- WatermelonCitrullus lanatust0
- Interactor
- Bacillus megaterium
Priestia megateriume0symbiont - Outcome
- Bacillus megateriume0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Watermelon”
e0“BR-1, BR-16, BR-17, and BR-44 belonged to Bacillus subtilis, Bacillus cereus, Bacillus megaterium, and Bacillus subtilis, respectively”
Claim · model-written summary
The optimized liquid inoculant reached OD600 1.866 and a viable count of 8.955 × 109 CFU/mL.
- Taxon
- WatermelonCitrullus lanatust0
- Outcome
- effective viable counte0
- Value
- 8.955 × 109 CFU/mLe0
- Qualifier
- OD600 of 1.866e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Watermelon”
e0“In the optimized process, a liquid bacterial inoculant with an OD600 of 1.866 was obtained, with an effective viable count of 8.955 × 109 CFU/mL”
Claim · model-written summary
A bran-based solid inoculant reached a viable count of 1.11 × 109 CFU/g.
- Taxon
- WatermelonCitrullus lanatust0
- Outcome
- effective viable counte0
- Value
- 1.11 × 109 CFU/ge0
- Qualifier
- bran as a substratee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Watermelon”
e0“A solid bacterial inoculant was prepared by using bran as a substrate, and its effective viable count was 1.11 × 109 CFU/g”
Claim · model-written summary
Applying bacterial inoculants promoted watermelon growth.
- Taxon
- watermelonCitrullus lanatuse0
- Treatment
- application of the bacterial inoculantse0
- Interactor
- bacterial inoculantse0symbiont
- Outcome
- growth of watermelone0
- Direction
- promotede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Watermelon”
e0“The application of the bacterial inoculants promoted the growth of watermelon”
Claim · model-written summary
Applying bacterial inoculants increased watermelon photosynthetic efficiency.
- Taxon
- watermelonCitrullus lanatuse0
- Treatment
- application of the bacterial inoculantse0
- Interactor
- bacterial inoculantse0symbiont
- Outcome
- photosynthetic efficiencye0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Watermelon”
e0“The application of the bacterial inoculants promoted the growth of watermelon, increased the photosynthetic efficiency and yield”
Claim · model-written summary
Applying bacterial inoculants increased watermelon yield.
- Taxon
- watermelonCitrullus lanatuse0
- Treatment
- application of the bacterial inoculantse0
- Interactor
- bacterial inoculantse0symbiont
- Outcome
- yielde0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Watermelon”
e0“The application of the bacterial inoculants promoted the growth of watermelon, increased the photosynthetic efficiency and yield”
Claim · model-written summary
Applying bacterial inoculants improved watermelon fruit quality.
- Taxon
- watermelonCitrullus lanatuse0
- Treatment
- application of the bacterial inoculantse0
- Interactor
- bacterial inoculantse0symbiont
- Outcome
- fruit qualitye0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Watermelon”
e0“The application of the bacterial inoculants promoted the growth of watermelon, increased the photosynthetic efficiency and yield, and improved fruit quality”
The same questions in other papers
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- negative
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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.