Abstract
Effects of four plant growth-promoting rhizobacteria (PGPR) , namely Pseudomonas sp. YT3, Bacillus subtilis DZ1, B. cereus L90 and B. fusiformis L13 on the biological characteristics of walnut (Juglans regia) rhizosphere soil under drought stress were investigated. Results showed that drought stress had little effect on available nutrients of walnut rhizosphere soil, but significantly decreased the activity of organic carbon by 18.4% and increased the pH from 7.34 to 7.79. Under drought stress condition, the inoculation of Bacillus cereus L90 significantly increased high-labile organic carbon in walnut rhizosphere by 14.5% relative to the un-inoculated control, and decreased the pH to 7.41. Compared with the irrigated control, the total microbial populations, root exudates, microbial biomass carbon, and microbial biomass nitrogen in walnut rhizosphere soil were significantly decreased by 36.0%, 20.7%, 33.5% and 30.7%, respectively, because of drought stress. However, L90 inoculation decreased these deficits to 14.1%, 10.3%, 12.1% and 12.7%, respectively. Some terminal restriction fragments (T-RFs) disappeared under the drought condition and PGPR inoculation had great influence on T-RFs according to Terminal Restriction Fragment Length Polymorphism profiles. The Margalef index and the Shannon index of walnut rhizosphere soil significantly decreased, but the Simpson index increased relative to the irrigated control. Compared with the un-inoculated control, the Margalef index significantly increased from 0.42 to 0.99, as well as the Shannon index increased from 0.52 to 0.98. However, the Simpson index de- creased from 0.60 to 0.39. Inoculating YT3, DZ1 and L13 had weaker effects on the biological characteristics of walnut rhizosphere soil compared to inoculating L90, suggesting L90 inoculation could interfere with the suppression of drought stress to the biological characteristics of walnut rhizosphere soil.
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Claims 20
Claim · model-written summary
Drought stress significantly decreased the activity of organic carbon in walnut rhizosphere soil by 18.4%, with little effect on available nutrients.
- Taxon
- walnute1
- Treatment
- drought stresse1
- Outcome
- activity of organic carbone1
- Direction
- decreasede1
- Value
- 18.4%e1
Not reportedComparator
Verbatim
e1“Results showed that drought stress had little effect on available nutrients of walnut rhizosphere soil, but significantly decreased the activity of organic carbon by 18.4% and increased the pH from 7.34 to 7.79”
Claim · model-written summary
Drought stress increased the pH of walnut rhizosphere soil from 7.34 to 7.79.
Not reportedComparator
Verbatim
e1“Results showed that drought stress had little effect on available nutrients of walnut rhizosphere soil, but significantly decreased the activity of organic carbon by 18.4% and increased the pH from 7.34 to 7.79”
Claim · model-written summary
Under drought, inoculation with Bacillus cereus L90 increased high-labile organic carbon in walnut rhizosphere by 14.5% relative to the un-inoculated control.
- Taxon
- walnute1
- Treatment
- inoculation of Bacillus cereus L90e1
- Interactor
- Bacillus cereus L90
Bacillus cereuse1symbiont - Outcome
- high-labile organic carbone1
- Direction
- increasede1
- Value
- 14.5%e1
- Qualifier
- Under drought stress conditione1
- Comparator
- un-inoculated controle1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Under drought stress condition, the inoculation of Bacillus cereus L90 significantly increased high-labile organic carbon in walnut rhizosphere by 14.5% relative to the un-inoculated control, and decreased the pH to 7.41”
Claim · model-written summary
Inoculation with Bacillus cereus L90 decreased the pH of walnut rhizosphere soil under drought to 7.41.
- Taxon
- walnute1
- Treatment
- inoculation of Bacillus cereus L90e1
- Interactor
- Bacillus cereus L90Bacillus cereuse1symbiont
- Outcome
- pHe1
- Direction
- decreasede1
- Value
- 7.41e1
- Comparator
- un-inoculated controle1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Under drought stress condition, the inoculation of Bacillus cereus L90 significantly increased high-labile organic carbon in walnut rhizosphere by 14.5% relative to the un-inoculated control, and decreased the pH to 7.41”
Claim · model-written summary
Drought stress decreased total microbial populations in walnut rhizosphere soil by 36.0% relative to the irrigated control.
Verbatim
e1“Compared with the irrigated control, the total microbial populations, root exudates, microbial biomass carbon, and microbial biomass nitrogen in walnut rhizosphere soil were significantly decreased by 36.0%, 20.7%, 33.5% and 30.7%, respectively, because of drought stress”
Claim · model-written summary
Drought stress decreased root exudates in walnut rhizosphere soil by 20.7% relative to the irrigated control.
Verbatim
e1“Compared with the irrigated control, the total microbial populations, root exudates, microbial biomass carbon, and microbial biomass nitrogen in walnut rhizosphere soil were significantly decreased by 36.0%, 20.7%, 33.5% and 30.7%, respectively, because of drought stress”
Claim · model-written summary
Drought stress decreased microbial biomass carbon in walnut rhizosphere soil by 33.5% relative to the irrigated control.
Verbatim
e1“Compared with the irrigated control, the total microbial populations, root exudates, microbial biomass carbon, and microbial biomass nitrogen in walnut rhizosphere soil were significantly decreased by 36.0%, 20.7%, 33.5% and 30.7%, respectively, because of drought stress”
Claim · model-written summary
Drought stress decreased microbial biomass nitrogen in walnut rhizosphere soil by 30.7% relative to the irrigated control.
Verbatim
e1“Compared with the irrigated control, the total microbial populations, root exudates, microbial biomass carbon, and microbial biomass nitrogen in walnut rhizosphere soil were significantly decreased by 36.0%, 20.7%, 33.5% and 30.7%, respectively, because of drought stress”
Claim · model-written summary
L90 inoculation reduced the drought-induced deficit in total microbial populations of walnut rhizosphere soil to 14.1%.
- Taxon
- walnute1
- Treatment
- L90 inoculatione2
- Interactor
- L90e2symbiont
- Outcome
- total microbial populationse1
- Direction
- decreasede2
- Value
- 14.1%e2
Not reportedComparator
Verbatim
e1“Compared with the irrigated control, the total microbial populations, root exudates, microbial biomass carbon, and microbial biomass nitrogen in walnut rhizosphere soil were significantly decreased by 36.0%, 20.7%, 33.5% and 30.7%, respectively, because of drought stress”
e2“However, L90 inoculation decreased these deficits to 14.1%, 10.3%, 12.1% and 12.7%, respectively”
Claim · model-written summary
L90 inoculation reduced the drought-induced deficit in root exudates of walnut rhizosphere soil to 10.3%.
- Taxon
- walnute1
- Treatment
- L90 inoculatione2
- Interactor
- L90e2symbiont
- Outcome
- root exudatese1
- Direction
- decreasede2
- Value
- 10.3%e2
Not reportedComparator
Verbatim
e1“Compared with the irrigated control, the total microbial populations, root exudates, microbial biomass carbon, and microbial biomass nitrogen in walnut rhizosphere soil were significantly decreased by 36.0%, 20.7%, 33.5% and 30.7%, respectively, because of drought stress”
e2“However, L90 inoculation decreased these deficits to 14.1%, 10.3%, 12.1% and 12.7%, respectively”
Claim · model-written summary
L90 inoculation reduced the drought-induced deficit in microbial biomass carbon of walnut rhizosphere soil to 12.1%.
- Taxon
- walnute1
- Treatment
- L90 inoculatione2
- Interactor
- L90e2symbiont
- Outcome
- microbial biomass carbone1
- Direction
- decreasede2
- Value
- 12.1%e2
Not reportedComparator
Verbatim
e1“Compared with the irrigated control, the total microbial populations, root exudates, microbial biomass carbon, and microbial biomass nitrogen in walnut rhizosphere soil were significantly decreased by 36.0%, 20.7%, 33.5% and 30.7%, respectively, because of drought stress”
e2“However, L90 inoculation decreased these deficits to 14.1%, 10.3%, 12.1% and 12.7%, respectively”
Claim · model-written summary
L90 inoculation reduced the drought-induced deficit in microbial biomass nitrogen of walnut rhizosphere soil to 12.7%.
- Taxon
- walnute1
- Treatment
- L90 inoculatione2
- Interactor
- L90e2symbiont
- Outcome
- microbial biomass nitrogene1
- Direction
- decreasede2
- Value
- 12.7%e2
Not reportedComparator
Verbatim
e1“Compared with the irrigated control, the total microbial populations, root exudates, microbial biomass carbon, and microbial biomass nitrogen in walnut rhizosphere soil were significantly decreased by 36.0%, 20.7%, 33.5% and 30.7%, respectively, because of drought stress”
e2“However, L90 inoculation decreased these deficits to 14.1%, 10.3%, 12.1% and 12.7%, respectively”
Claim · model-written summary
Some terminal restriction fragments (T-RFs) of walnut rhizosphere soil disappeared under drought.
- Taxon
- walnute2
- Outcome
- terminal restriction fragments (T-RFs) disappearede1
- Qualifier
- under the drought conditione1
Not reportedDirection
Verbatim
e1“Some terminal restriction fragments (T-RFs) disappeared under the drought condition”
e2“Results showed that drought stress had little effect on available nutrients of walnut rhizosphere soil, but significantly decreased the activity of organic carbon by 18.4% and increased the pH from 7.34 to 7.79”
Claim · model-written summary
PGPR inoculation had a great influence on terminal restriction fragments (T-RFs) of walnut rhizosphere soil, without a stated direction.
Not reportedDirection
Verbatim
e1“PGPR inoculation had great influence on T-RFs according to Terminal Restriction Fragment Length Polymorphism profiles”
e2“Results showed that drought stress had little effect on available nutrients of walnut rhizosphere soil, but significantly decreased the activity of organic carbon by 18.4% and increased the pH from 7.34 to 7.79”
Claim · model-written summary
Drought stress significantly decreased the Margalef and Shannon indices of walnut rhizosphere soil relative to the irrigated control.
Verbatim
e1“The Margalef index and the Shannon index of walnut rhizosphere soil significantly decreased, but the Simpson index increased relative to the irrigated control”
e2“Compared with the irrigated control, the total microbial populations, root exudates, microbial biomass carbon, and microbial biomass nitrogen in walnut rhizosphere soil were significantly decreased by 36.0%, 20.7%, 33.5% and 30.7%, respectively, because of drought stress”
Claim · model-written summary
Drought stress increased the Simpson index of walnut rhizosphere soil relative to the irrigated control.
Verbatim
e1“The Margalef index and the Shannon index of walnut rhizosphere soil significantly decreased, but the Simpson index increased relative to the irrigated control”
e2“Compared with the irrigated control, the total microbial populations, root exudates, microbial biomass carbon, and microbial biomass nitrogen in walnut rhizosphere soil were significantly decreased by 36.0%, 20.7%, 33.5% and 30.7%, respectively, because of drought stress”
Claim · model-written summary
PGPR inoculation significantly increased the Margalef index of walnut rhizosphere soil from 0.42 to 0.99 relative to the un-inoculated control.
Verbatim
e1“Compared with the un-inoculated control, the Margalef index significantly increased from 0.42 to 0.99, as well as the Shannon index increased from 0.52 to 0.98. However, the Simpson index de- creased from 0.60 to 0.39”
e2“Effects of four plant growth-promoting rhizobacteria (PGPR) , namely Pseudomonas sp. YT3, Bacillus subtilis DZ1, B. cereus L90 and B. fusiformis L13 on the biological characteristics of walnut (Juglans regia) rhizosphere soil under drought stress were investigated”
Claim · model-written summary
PGPR inoculation increased the Shannon index of walnut rhizosphere soil from 0.52 to 0.98 relative to the un-inoculated control.
Verbatim
e1“Compared with the un-inoculated control, the Margalef index significantly increased from 0.42 to 0.99, as well as the Shannon index increased from 0.52 to 0.98. However, the Simpson index de- creased from 0.60 to 0.39”
e2“Effects of four plant growth-promoting rhizobacteria (PGPR) , namely Pseudomonas sp. YT3, Bacillus subtilis DZ1, B. cereus L90 and B. fusiformis L13 on the biological characteristics of walnut (Juglans regia) rhizosphere soil under drought stress were investigated”
Claim · model-written summary
PGPR inoculation decreased the Simpson index of walnut rhizosphere soil from 0.60 to 0.39 relative to the un-inoculated control.
Verbatim
e1“Compared with the un-inoculated control, the Margalef index significantly increased from 0.42 to 0.99, as well as the Shannon index increased from 0.52 to 0.98. However, the Simpson index de- creased from 0.60 to 0.39”
e2“Effects of four plant growth-promoting rhizobacteria (PGPR) , namely Pseudomonas sp. YT3, Bacillus subtilis DZ1, B. cereus L90 and B. fusiformis L13 on the biological characteristics of walnut (Juglans regia) rhizosphere soil under drought stress were investigated”
Claim · model-written summary
Inoculation with YT3, DZ1 and L13 had weaker effects on walnut rhizosphere soil biological characteristics than inoculation with L90.
Verbatim
e1“Inoculating YT3, DZ1 and L13 had weaker effects on the biological characteristics of walnut rhizosphere soil compared to inoculating L90”
The same questions in other papers
drought · soil: biology · Juglans (walnuts)Positive and negative results
1 in the opposite direction
- positive
inoculation · soil: biology · Juglans (walnuts)Results agree
1 paper in the same direction as this paper
- positive
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.