Abstract
Aims Our objective was to investigate the saline-alkali tolerance mechanism of Nitratia tangutorum to provide the basis for its use in saline areas in Heilongjiang Province of China and contribute to the theoretical understand- ing of urban tree species. Methods We treated seedlings of N. tangutorum to 20 kinds of mixed salt solutions with different salinities and alkalinities and examined saline-alkali stress on lipid peroxidation and enzyme activities. Important findings Injury to the plasma membrane of leaves increased with increasing salinity and alkalinity. Cell membrane permeability and electrolyte leakage of leaves were enhanced under salinity of 300 mmol·L -1 . The selectivity of plasma membrane permeability was damaged. The variation of malondialdehyde lipid peroxidation as plasmalemma peroxide product was consistent with that of electrolyte leakage, which showed a significant positive correlation (r = 0.796). The activities of superoxide dismutase, peroxidase and catalase increased with both increased salinity and pH, which enhanced the ability of the active cell membrane system. Linear regression analysis showed that the significance order of four stress factors is salinity > pH > (HCO3 - ) > (CO3 2- ). Nitratia tangutorum had a high tolerance to complex saline-alkali stress when the salinity was < 300 mmol·L -1 and pH was < 10.59.
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Claims 8
Claim · model-written summary
Leaf plasma membrane injury increased with salinity and alkalinity.
Verbatim
e0“Injury to the plasma membrane of leaves increased with increasing salinity and alkalinity”
t0“Nitratia tangutorum”
Claim · model-written summary
Cell membrane permeability increased at 300 mmol·L -1 salinity.
- Taxon
- Nitratia tangutorumt0
- Treatment
- salinity of 300 mmol·L -1e0
- Outcome
- Cell membrane permeabilitye0
- Direction
- enhancede0
Not reportedComparator
Verbatim
e0“Cell membrane permeability and electrolyte leakage of leaves were enhanced under salinity of 300 mmol·L -1”
t0“Nitratia tangutorum”
Claim · model-written summary
Electrolyte leakage increased at 300 mmol·L -1 salinity.
- Taxon
- Nitratia tangutorumt0
- Treatment
- salinity of 300 mmol·L -1e0
- Outcome
- electrolyte leakage of leavese0
- Direction
- enhancede0
Not reportedComparator
Verbatim
e0“Cell membrane permeability and electrolyte leakage of leaves were enhanced under salinity of 300 mmol·L -1”
t0“Nitratia tangutorum”
Claim · model-written summary
Plasma membrane permeability selectivity was damaged.
Not reportedDirection
Verbatim
e0“The selectivity of plasma membrane permeability was damaged”
t0“Nitratia tangutorum”
Claim · model-written summary
Malondialdehyde lipid peroxidation correlated positively with electrolyte leakage.
Verbatim
e0“malondialdehyde lipid peroxidation as plasmalemma peroxide product was consistent with that of electrolyte leakage, which showed a significant positive correlation (r = 0.796)”
t0“Nitratia tangutorum”
Claim · model-written summary
Superoxide dismutase, peroxidase and catalase activities increased with salinity and pH.
Verbatim
e0“The activities of superoxide dismutase, peroxidase and catalase increased with both increased salinity and pH”
t0“Nitratia tangutorum”
Claim · model-written summary
Stress-factor influence ranked salinity above pH above bicarbonate above carbonate.
Not reportedDirection
Verbatim
e0“the significance order of four stress factors is salinity > pH > (HCO3 - ) > (CO3 2- )”
t0“Nitratia tangutorum”
Claim · model-written summary
The plant tolerated complex saline-alkali stress below 300 mmol·L -1 salinity and pH 10.59.
- Taxon
- Nitratia tangutorume0
- Outcome
- high tolerance to complex saline-alkali stresse0
- Qualifier
- salinity was < 300 mmol·L -1 and pH was < 10.59e0
Not reportedDirection
Verbatim
e0“Nitratia tangutorum had a high tolerance to complex saline-alkali stress when the salinity was < 300 mmol·L -1 and pH was < 10.59”