Abstract
Abstract Endophytes isolated from extremophile plants are interesting microbes for improving the stress tolerance of agricultural plants. Here, we isolated and characterized endophytic bacteria showing plant growth-promoting (PGP) traits from plants in two extreme Chilean biomes (Atacama Desert and Chilean Patagonia). Forty-two isolates were characterized as both halotolerant auxin producers (2–51 mg L −1 ) and 1-aminocyclopropane-1-carboxylate (ACC)-degrading bacteria (15–28 µmol αKB mg protein −1 h −1 ). The most efficient isolates were tested as single strains, in dual and triple consortia, or in combination with previously reported PGP rhizobacteria ( Klebsiell a sp. 27IJA and 8LJA) for their impact on the germination of salt-exposed (0.15 M and 0.25 M NaCl) wheat seeds. Interestingly, strain P1R9, identified as Variovorax sp., enhanced wheat germination under salt stress conditions when applied individually or as part of bacterial consortia. Under salt stress, plants inoculated with dual consortia containing the strain Variovorax sp. P1R9 showed higher biomass (41%) and reduced lipid peroxidation (33–56%) than uninoculated plants. Although the underlying mechanisms remain elusive, our data suggest that the application of Variovorax sp. P1R9, alone or as a member of PGP consortia, may improve the salt stress tolerance of wheat plants.
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Claims 6
Claim · model-written summary
Forty-two isolates were halotolerant auxin producers.
Verbatim
e0“endophytic bacteria showing plant growth-promoting (PGP) traits from plants in two extreme Chilean biomes (Atacama Desert and Chilean Patagonia). Forty-two isolates were characterized as both halotolerant auxin producers (2–51 mg L −1 ) and 1-aminocyclopropane-1-carboxylate (ACC)-degrading bacteria (15–28 µmol αKB mg protein −1 h −1 )”
t0“bacterial consortia”
Claim · model-written summary
Forty-two isolates degraded ACC.
Verbatim
e0“endophytic bacteria showing plant growth-promoting (PGP) traits from plants in two extreme Chilean biomes (Atacama Desert and Chilean Patagonia). Forty-two isolates were characterized as both halotolerant auxin producers (2–51 mg L −1 ) and 1-aminocyclopropane-1-carboxylate (ACC)-degrading bacteria (15–28 µmol αKB mg protein −1 h −1 )”
t0“bacterial consortia”
Claim · model-written summary
Variovorax P1R9 enhanced wheat germination under salt stress alone or in consortia.
- Taxon
- wheat
Triticum aestivume0 - Treatment
- strain P1R9e0
- Interactor
- Variovorax sp.Variovoraxe0symbiont
- Outcome
- wheat germinatione0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“strain P1R9, identified as Variovorax sp., enhanced wheat germination under salt stress conditions when applied individually or as part of bacterial consortia”
Claim · model-written summary
Dual consortia containing Variovorax P1R9 increased wheat biomass by 41%.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- dual consortia containing the strain Variovorax sp. P1R9e0
- Interactor
- Variovorax sp. P1R9e0symbiont
- Outcome
- biomasse0
- Direction
- highere0
- Value
- 41%e0
- Comparator
- uninoculated plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plants inoculated with dual consortia containing the strain Variovorax sp. P1R9 showed higher biomass (41%) and reduced lipid peroxidation (33–56%) than uninoculated plants”
t0“wheat”
Claim · model-written summary
Dual consortia containing Variovorax P1R9 reduced wheat lipid peroxidation by 33–56%.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- dual consortia containing the strain Variovorax sp. P1R9e0
- Interactor
- Variovorax sp. P1R9e0symbiont
- Outcome
- lipid peroxidatione0
- Direction
- reducede0
- Value
- 33–56%e0
- Comparator
- uninoculated plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plants inoculated with dual consortia containing the strain Variovorax sp. P1R9 showed higher biomass (41%) and reduced lipid peroxidation (33–56%) than uninoculated plants”
t0“wheat”
Claim · model-written summary
Authors suggest P1R9 may improve wheat salt tolerance.
- Taxon
- wheatTriticum aestivume0
- Treatment
- application of Variovorax sp. P1R9e0
- Interactor
- Variovorax sp. P1R9e0symbiont
- Outcome
- improve the salt stress tolerancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“application of Variovorax sp. P1R9, alone or as a member of PGP consortia, may improve the salt stress tolerance of wheat plants”