Abstract
The effect of phytostimulating rhizobacteria Paenibacillus polymyxa CCM 1465 (P. polymyxa) and their exopolysaccharides (EPS) on the functioning of the pro-/antioxidant system of wheat seedlings was studied under optimal growth conditions and under osmotic stress (20% of polyethyleneglycol-6000 (PEG), 3 days). It was found that under the optimal culture conditions, the activity of catalase and peroxidase in the experimental plant leaves was practically not distinct from the controls (plants untreated with either bacteria or EPS). The malondialdehyde (MDA) content, as an indicator of oxidative stress in plants, under optimal growth conditions did not change when wheat seedlings were inoculated with the bacteria P. polymyxa, and even decreased when the roots were treated with EPS of these bacteria. Osmotic stress inhibited catalase activity in both controls and plants treated with bacteria or EPS. Stress conditions increased peroxidase activity in the experimental variants. In the course of repair, catalase activity enhanced and leveled off towards controls not exposed to stress, while peroxidase activity remained at a higher level in bacterized and EPS-treated plants. The antioxidant enzymes activity alteration contributed to lowering MDA level in wheat seedling leaves after having gone through stress and repair, that ameliorated the oxidative stress-induced impact on plants, and promoted their rapid recovery after stress.
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Claims 9
Claim · model-written summary
Catalase and peroxidase activity with bacteria or EPS was practically unchanged under optimal conditions.
- Taxon
- wheat seedlings
Triticum aestivumt0 - Treatment
- bacteria or EPSe0
- Interactor
- Paenibacillus polymyxa
Paenibacillus polymyxat1symbiont - Outcome
- activity of catalase and peroxidasee0
- Direction
- practically not distincte0
- Comparator
- controls (plants untreated with either bacteria or EPS)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“under the optimal culture conditions, the activity of catalase and peroxidase in the experimental plant leaves was practically not distinct from the controls (plants untreated with either bacteria or EPS).”
t0“wheat seedlings”
t1“Paenibacillus polymyxa”
Claim · model-written summary
Bacterial inoculation left MDA content unchanged in optimal growth conditions.
- Taxon
- wheat seedlingsTriticum aestivume0
- Treatment
- inoculated with the bacteria P. polymyxae0
- Interactor
- P. polymyxaPaenibacillus polymyxae0symbiont
- Outcome
- malondialdehyde (MDA) contente0
- Direction
- did not changee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The malondialdehyde (MDA) content, as an indicator of oxidative stress in plants, under optimal growth conditions did not change when wheat seedlings were inoculated with the bacteria P. polymyxa”
t0“Paenibacillus polymyxa”
Claim · model-written summary
EPS treatment decreased MDA content under optimal conditions.
- Taxon
- wheat seedlingsTriticum aestivume0
- Organ / stage
- rootse0
- Treatment
- roots were treated with EPSe0
- Interactor
- P. polymyxaPaenibacillus polymyxae0symbiont
- Outcome
- malondialdehyde (MDA) contente0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The malondialdehyde (MDA) content, as an indicator of oxidative stress in plants, under optimal growth conditions did not change when wheat seedlings were inoculated with the bacteria P. polymyxa, and even decreased when the roots were treated with EPS of these bacteria.”
Claim · model-written summary
Osmotic stress inhibited catalase activity in controls and treated plants.
- Taxon
- wheat seedlingsTriticum aestivumt0
- Treatment
- Osmotic stresse0
- Outcome
- catalase activitye0
- Direction
- inhibitede0
- Comparator
- controls and plants treated with bacteria or EPSe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Osmotic stress inhibited catalase activity in both controls and plants treated with bacteria or EPS.”
t0“wheat seedlings”
Claim · model-written summary
Stress increased peroxidase activity in experimental variants.
- Taxon
- wheat seedlingsTriticum aestivumt0
- Treatment
- Stress conditionse0
- Outcome
- peroxidase activitye0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Stress conditions increased peroxidase activity in the experimental variants.”
t0“wheat seedlings”
Claim · model-written summary
Catalase activity increased during repair to approach unstressed controls.
- Taxon
- wheat seedlingsTriticum aestivumt0
- Outcome
- catalase activitye0
- Direction
- enhancede0
- Comparator
- controls not exposed to stresse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the course of repair, catalase activity enhanced and leveled off towards controls not exposed to stress”
t0“wheat seedlings”
Claim · model-written summary
Peroxidase activity remained elevated during repair in bacterized and EPS-treated plants.
- Taxon
- wheat seedlingsTriticum aestivumt0
- Interactor
- Paenibacillus polymyxaPaenibacillus polymyxat1symbiont
- Outcome
- peroxidase activitye0
- Direction
- highere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“peroxidase activity remained at a higher level in bacterized and EPS-treated plants.”
t0“wheat seedlings”
t1“Paenibacillus polymyxa”
Claim · model-written summary
Antioxidant enzyme changes lowered MDA in leaves after stress and repair.
- Taxon
- wheatTriticum aestivume0
- Organ / stage
- leavese0
- Outcome
- MDA levele0
- Direction
- loweringe0
- Qualifier
- antioxidant enzymes activity alteratione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The antioxidant enzymes activity alteration contributed to lowering MDA level in wheat seedling leaves after having gone through stress and repair”
Claim · model-written summary
Reduced oxidative impact promoted rapid post-stress recovery.
- Taxon
- wheat seedlingsTriticum aestivumt0
- Outcome
- rapid recovery after stresse0
- Direction
- promotede0
- Qualifier
- oxidative stress-induced impacte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“that ameliorated the oxidative stress-induced impact on plants, and promoted their rapid recovery after stress.”
t0“wheat seedlings”
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