Abstract
To mitigate the stress of cadmium (Cd) on crops and reduce Cd accumulation in crops, maize (Zea mays) seedlings were treated with gamma-aminobutyric acid (GABA, 0.5 mmol L−1) irrigation under Cd stress conditions. The effects of GABA on the physiology and Cd uptake of maize seedlings were investigated through a pot experiment. Results showed that under Cd stress, applying 0.5 mmol L−1 exogenous GABA decreased maize seedling root and shoot biomass by 5.85% and 3.85%, respectively, compared to Cd treatment alone. Exogenous GABA also reduced the levels of photosynthetic pigments (chlorophyll a, chlorophyll b, and carotenoid) in maize seedlings under Cd stress. Regarding antioxidant enzyme activity, exogenous GABA increased the activities of peroxidase (POD) and superoxide dismutase (SOD) in maize seedlings under Cd stress while having no effect on catalase activity. In addition, exogenous GABA irrigation increased the concentrations of root Cd and shoot Cd in maize seedlings by 11.93% and 23.22%, respectively, compared to Cd treatment alone. Therefore, the irrigation of exogenous GABA (0.5 mmol L−1) is found to inhibit growth and promote Cd uptake in maize seedlings under Cd stress conditions.
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Claims 7
Claim · model-written summary
GABA reduced maize seedling root biomass by 5.85% relative to Cd treatment alone.
- Organ / stage
- seedling roote0
- Treatment
- 0.5 mmol L−1 exogenous GABAe0
- Outcome
- biomasse0
- Direction
- decreasede0
- Value
- 5.85%e0
- Comparator
- Cd treatment alonee0
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“applying 0.5 mmol L−1 exogenous GABA decreased maize seedling root and shoot biomass by 5.85% and 3.85%, respectively, compared to Cd treatment alone.”
Claim · model-written summary
GABA reduced maize seedling shoot biomass by 3.85% relative to Cd treatment alone.
- Organ / stage
- shoote0
- Treatment
- 0.5 mmol L−1 exogenous GABAe0
- Outcome
- shoot biomasse0
- Direction
- decreasede0
- Value
- 3.85%e0
- Comparator
- Cd treatment alonee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“applying 0.5 mmol L−1 exogenous GABA decreased maize seedling root and shoot biomass by 5.85% and 3.85%, respectively, compared to Cd treatment alone.”
Claim · model-written summary
GABA reduced chlorophyll a, chlorophyll b and carotenoid in Cd-stressed maize seedlings.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exogenous GABA also reduced the levels of photosynthetic pigments (chlorophyll a, chlorophyll b, and carotenoid) in maize seedlings under Cd stress.”
Claim · model-written summary
GABA increased POD and SOD activities in Cd-stressed maize seedlings.
- Treatment
- exogenous GABAe0
- Outcome
- activities of peroxidase (POD) and superoxide dismutase (SOD)e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“exogenous GABA increased the activities of peroxidase (POD) and superoxide dismutase (SOD) in maize seedlings under Cd stress”
Claim · model-written summary
GABA had no effect on catalase activity in Cd-stressed maize seedlings.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“while having no effect on catalase activity.”
e1“exogenous GABA increased the activities of peroxidase (POD) and superoxide dismutase (SOD) in maize seedlings under Cd stress”
Claim · model-written summary
GABA increased maize root Cd concentration by 11.93% relative to Cd alone.
- Treatment
- exogenous GABA irrigatione0
- Outcome
- root Cde0
- Direction
- increasede0
- Value
- 11.93%e0
- Comparator
- Cd treatment alonee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“exogenous GABA irrigation increased the concentrations of root Cd and shoot Cd in maize seedlings by 11.93% and 23.22%, respectively, compared to Cd treatment alone.”
Claim · model-written summary
GABA increased maize shoot Cd concentration by 23.22% relative to Cd alone.
- Treatment
- exogenous GABA irrigatione0
- Outcome
- shoot Cde0
- Direction
- increasede0
- Value
- 23.22%e0
- Comparator
- Cd treatment alonee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“exogenous GABA irrigation increased the concentrations of root Cd and shoot Cd in maize seedlings by 11.93% and 23.22%, respectively, compared to Cd treatment alone.”
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