Abstract
Plant growth-promoting rhizobacteria (PGPRs) that produce 1-aminocyclopropane-1-carboxylate (ACC) deaminase are capable of reducing limits to plant growth due to water-deficient conditions. Here, seven PGPR strains that can produce ACC deaminase were successfully obtained from the rhizosphere soil of grapevine ( Vitis vinifera L.) in arid regions of China. The strains belonged to three different genera: Pseudomonas , Enterobacter , and Achromobacter , according to their 16S rDNA sequencing analysis. A drought tolerance experiment revealed two PGPR strains (DR3 and DR6) with exceptionally high phosphate solubilization, nitrogen fixation, indoleacetic acid (IAA), and exopolysaccharides secretion potential. Both strains were selected for use in a pot experiment to evaluate their growth-promoting effects on grapevines under drought conditions. Each of these two PGPRs and their mixed inoculation into grapevines were expected to alleviate the comprehensive growth inhibition of grapevines caused by drought stress. The mixed inoculation was hypothesized to elicit the best growth-promoting effects. Inoculation with the PGPRs not only enhanced the root-adhering soil/root tissue ratios and soil aggregate stability, but it also increased the nitrogen and phosphorus levels in the soil and plant leaves. Further, inoculation with PGPRs significantly altered the plant height, biomass of shoot and root organs, relative water contents, and net photosynthetic rate of leaves, enabling grapevines to better cope with drought. Moreover, the contents of IAA, abscisic acid, and malondialdehyde in these grapevines under drought stress were significantly changed by PGPRs. They indirectly affected biochemical and physiological properties of grapevines to alleviate their drought stress. Taken together, these results demonstrate that the DR3 and DR6 PGPRs might be useful for effectively weakening the growth inhibition caused by drought in grapevines. The strains might also be applied as effective bioinoculants to maintain the quality of wine grapes.
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Claims 9
Claim · model-written summary
Seven ACC-deaminase-producing PGPR strains were recovered from grapevine rhizosphere soil.
- Interactor
- PGPR strainse0symbiont
- Outcome
- PGPR strains that can produce ACC deaminase were successfully obtainede0
- Value
- seven PGPR strainse0
- Setting
- arid regions of Chinae0
VitisOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“seven PGPR strains that can produce ACC deaminase were successfully obtained from the rhizosphere soil of grapevine ( Vitis vinifera L.) in arid regions of China”
Claim · model-written summary
The isolated strains belonged to Pseudomonas, Enterobacter, and Achromobacter.
- Interactor
- Pseudomonas
Pseudomonase0symbiont - Outcome
- belonged to three different genera: Pseudomonas , Enterobacter , and Achromobactere0
- Value
- three different generae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The strains belonged to three different genera: Pseudomonas , Enterobacter , and Achromobacter”
e1“rhizosphere soil of grapevine”
Claim · model-written summary
DR3 and DR6 had exceptionally high phosphate solubilization, nitrogen fixation, IAA production, and exopolysaccharide secretion potential.
- Interactor
- PGPR strainse0symbiont
- Outcome
- phosphate solubilization, nitrogen fixation, indoleacetic acid (IAA), and exopolysaccharides secretion potentiale0
- Direction
- exceptionally highe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“two PGPR strains (DR3 and DR6) with exceptionally high phosphate solubilization, nitrogen fixation, indoleacetic acid (IAA), and exopolysaccharides secretion potential”
e1“grapevine ( Vitis vinifera L.)”
Claim · model-written summary
PGPR inoculation increased root-adhering soil/root tissue ratios and soil aggregate stability.
- Treatment
- Inoculation with the PGPRse0
- Interactor
- PGPRse0symbiont
- Outcome
- root-adhering soil/root tissue ratios and soil aggregate stabilitye0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Inoculation with the PGPRs not only enhanced the root-adhering soil/root tissue ratios and soil aggregate stability”
e1“grapevines under drought conditions”
Claim · model-written summary
PGPR inoculation increased nitrogen and phosphorus levels in soil and leaves.
- Treatment
- Inoculation with the PGPRse0
- Interactor
- PGPRse0symbiont
- Outcome
- nitrogen and phosphorus levels in the soil and plant leavese0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Inoculation with the PGPRs not only enhanced the root-adhering soil/root tissue ratios and soil aggregate stability, but it also increased the nitrogen and phosphorus levels in the soil and plant leaves”
e1“grapevines under drought conditions”
Claim · model-written summary
PGPR inoculation significantly altered grapevine height and shoot and root biomass under drought.
- Treatment
- inoculation with PGPRse0
- Interactor
- PGPRse0symbiont
- Outcome
- plant height, biomass of shoot and root organse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“inoculation with PGPRs significantly altered the plant height, biomass of shoot and root organs, relative water contents, and net photosynthetic rate of leaves”
e1“grapevines to better cope with drought”
Claim · model-written summary
PGPR inoculation significantly altered leaf relative water content and net photosynthetic rate under drought.
- Treatment
- inoculation with PGPRse0
- Interactor
- PGPRse0symbiont
- Outcome
- relative water contents, and net photosynthetic rate of leavese0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“inoculation with PGPRs significantly altered the plant height, biomass of shoot and root organs, relative water contents, and net photosynthetic rate of leaves”
e1“grapevines to better cope with drought”
Claim · model-written summary
PGPR inoculation significantly changed IAA, abscisic acid, and malondialdehyde contents under drought.
- Treatment
- PGPRse0
- Interactor
- PGPRse0symbiont
- Outcome
- contents of IAA, abscisic acid, and malondialdehydee0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the contents of IAA, abscisic acid, and malondialdehyde in these grapevines under drought stress were significantly changed by PGPRs”
Claim · model-written summary
The authors suggest DR3 and DR6 as bioinoculants to maintain wine grape quality.
- Taxon
- wine grapes
Vitis viniferae0 - Interactor
- PGPRse1symbiont
- Outcome
- applied as effective bioinoculants to maintain the quality of wine grapese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The strains might also be applied as effective bioinoculants to maintain the quality of wine grapes”
e1“DR3 and DR6 PGPRs”
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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.