Abstract
Bacterial endophytes can colonize plant tissues without harming the plant. Instead, they are often able to increase plant growth and tolerance to environmental stresses. In this work, new strains of bacterial endophytes were isolated from three economically important crop plants (sorghum, cucumber and tomato) grown in three different regions in soils with different management. All bacterial strains were identified by 16S rRNA sequencing and characterized for plant beneficial traits. Based on physiological activities, we selected eight strains that were further tested for their antibiotic resistance profile and for the ability to efficiently colonize the interior of sorghum plants. According to the results of the re-inoculation test, five strains were used to inoculate sorghum seeds. Then, plant growth promotion activity was assessed on sorghum plants exposed to salinity stress. Only two bacterial endophytes increased plant biomass, but three of them delayed or reduced plant salinity stress symptoms. These five strains were then characterized for the ability to produce the enzyme 1-aminocyclopropane-1-carboxylate (ACC) deaminase, which is involved in the increase of stress tolerance. Pseudomonas brassicacearum SVB6R1 was the only strain that was able to produce this enzyme, suggesting that ACC deaminase is not the only physiological trait involved in conferring plant tolerance to salt stress in these bacterial strains.
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Claims 2
Claim · model-written summary
Two bacterial endophytes increased sorghum biomass.
- Treatment
- bacterial endophytese0
- Interactor
- bacterial endophytese0symbiont
- Outcome
- plant biomasse0
- Direction
- increasede0
- Qualifier
- salinity stresse1
SorghumNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Only two bacterial endophytes increased plant biomass”
e1“sorghum plants exposed to salinity stress”
Claim · model-written summary
Three endophytes delayed or reduced salinity stress symptoms.
- Treatment
- bacterial endophytese1
- Interactor
- bacterial endophytese1symbiont
- Outcome
- plant salinity stress symptomse0
- Direction
- delayed or reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“three of them delayed or reduced plant salinity stress symptoms”
e1“strains of bacterial endophytes were isolated”
e2“sorghum plants exposed to salinity stress”
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See all 76 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.