Abstract
[Objective] The study was carried out to reveal the changes of growth and antioxidant system in different organs of alfalfa seedling under salt stress and to provide some support for the study on alfalfa vegetation resumption.[Method] Two alfalfa cultivars,Xinmu No.1 (tolerant cultivar) and Northstar (sensitive cultivar) were used as the plant materials,and 0,200 mmol/L NaCl was used as control and stress treatment respectively.The study analyzed the seedling growth,H2O2 contents,MDA contents,membrane damage,activity and isozymes of antioxidant enzymes of alfalfa shoots and roots treated 7 days by 200 mmol/L NaCl.[Result] NaCl stress inhibited the growth of alfalfa shoots and roots,and resulted in the increase of H2O2,MDA contents and membrane damage. Lower degree of growth restraint effect and membrane damage of shoot and root organs were exhibited in Xinmu No.1 than Northstar.Under salt stress,antioxidant enzyme activity including superoxide dismutase (SOD),ascorbate peroxidase (APX),catalase (CAT) and peroxidase (POD) significantly increased.The capability of scavenging reactive oxygen species (ROS) took on organ difference in CAT and POD.The CAT activity in shoot was higher than that in root,but reversed in POD.SOD-Ⅱ,APX-Ⅰ,POD-Ⅲ and POD-Ⅳ were identified as sensitive isozyme bands to salt stress.[Conclusion] Tolerant alfalfa cultivar can reduce the damage by enhanced antioxidant protective ability under salt stress.
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Claims 10
Claim · model-written summary
NaCl stress inhibited growth of alfalfa shoots and roots compared with control.
- Taxon
- alfalfa
Medicago sativae0 - Organ / stage
- shoots and rootse1
- Treatment
- NaCl stresse1
- Outcome
- growthe1
- Direction
- inhibitede1
- Comparator
- controle7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Two alfalfa cultivars,Xinmu No.1 (tolerant cultivar) and Northstar (sensitive cultivar) were used as the plant materials”
e1“NaCl stress inhibited the growth of alfalfa shoots and roots”
e7“0,200 mmol/L NaCl was used as control and stress treatment respectively”
Claim · model-written summary
NaCl stress increased H2O2 and MDA contents and membrane damage in alfalfa.
- Taxon
- alfalfaMedicago sativae0
- Treatment
- NaCle7
- Outcome
- H2O2,MDA contents and membrane damagee2
- Direction
- increasee2
- Comparator
- controle7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Two alfalfa cultivars,Xinmu No.1 (tolerant cultivar) and Northstar (sensitive cultivar) were used as the plant materials”
e2“resulted in the increase of H2O2,MDA contents and membrane damage”
e7“0,200 mmol/L NaCl was used as control and stress treatment respectively”
Claim · model-written summary
Xinmu No.1 showed less growth restraint and membrane damage than Northstar under NaCl stress.
- Taxon
- alfalfaMedicago sativae0
- Material
- Xinmu No.1e3
- Organ / stage
- shoot and root organse3
- Treatment
- NaCle7
- Outcome
- growth restraint effect and membrane damagee3
- Direction
- Lower degreee3
- Comparator
- Northstare3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Two alfalfa cultivars,Xinmu No.1 (tolerant cultivar) and Northstar (sensitive cultivar) were used as the plant materials”
e3“Lower degree of growth restraint effect and membrane damage of shoot and root organs were exhibited in Xinmu No.1 than Northstar”
e7“0,200 mmol/L NaCl was used as control and stress treatment respectively”
Claim · model-written summary
Salt stress significantly increased antioxidant enzyme activity of SOD, APX and CAT in alfalfa.
- Taxon
- alfalfaMedicago sativae0
- Treatment
- salt stresse4
- Outcome
- antioxidant enzyme activitye4
- Direction
- significantly increasede4
- Qualifier
- superoxide dismutase (SOD),ascorbate peroxidase (APX),catalase (CAT)e4
- Comparator
- controle7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Two alfalfa cultivars,Xinmu No.1 (tolerant cultivar) and Northstar (sensitive cultivar) were used as the plant materials”
e4“Under salt stress,antioxidant enzyme activity including superoxide dismutase (SOD),ascorbate peroxidase (APX),catalase (CAT) and peroxidase (POD) significantly increased”
e7“0,200 mmol/L NaCl was used as control and stress treatment respectively”
Claim · model-written summary
Salt stress significantly increased peroxidase (POD) activity in alfalfa.
- Taxon
- alfalfaMedicago sativae0
- Treatment
- salt stresse4
- Outcome
- antioxidant enzyme activitye4
- Direction
- significantly increasede4
- Qualifier
- peroxidase (POD)e4
- Comparator
- controle7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Two alfalfa cultivars,Xinmu No.1 (tolerant cultivar) and Northstar (sensitive cultivar) were used as the plant materials”
e4“Under salt stress,antioxidant enzyme activity including superoxide dismutase (SOD),ascorbate peroxidase (APX),catalase (CAT) and peroxidase (POD) significantly increased”
e7“0,200 mmol/L NaCl was used as control and stress treatment respectively”
Claim · model-written summary
The capability of scavenging reactive oxygen species differed by organ for CAT and POD in alfalfa.
- Taxon
- alfalfaMedicago sativae0
- Compound
- reactive oxygen species (ROS)e5
- Outcome
- capability of scavenging reactive oxygen species (ROS)e5
- Direction
- took on organ differencee5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Two alfalfa cultivars,Xinmu No.1 (tolerant cultivar) and Northstar (sensitive cultivar) were used as the plant materials”
e5“The capability of scavenging reactive oxygen species (ROS) took on organ difference in CAT and POD”
Claim · model-written summary
CAT activity was higher in shoot than in root of alfalfa.
- Taxon
- alfalfaMedicago sativae0
- Organ / stage
- shoote6
- Outcome
- CAT activitye6
- Direction
- highere6
- Comparator
- roote6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Two alfalfa cultivars,Xinmu No.1 (tolerant cultivar) and Northstar (sensitive cultivar) were used as the plant materials”
e6“The CAT activity in shoot was higher than that in root,but reversed in POD”
Claim · model-written summary
POD activity showed the reverse organ pattern, higher in root than in shoot, in alfalfa.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Two alfalfa cultivars,Xinmu No.1 (tolerant cultivar) and Northstar (sensitive cultivar) were used as the plant materials”
e6“The CAT activity in shoot was higher than that in root,but reversed in POD”
Claim · model-written summary
SOD-II, APX-I, POD-III and POD-IV isozyme bands were identified as sensitive to salt stress.
- Taxon
- alfalfaMedicago sativae0
- Gene
- SOD-Ⅱ,APX-Ⅰ,POD-Ⅲ and POD-Ⅳe7
- Outcome
- sensitive isozyme bandse7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Two alfalfa cultivars,Xinmu No.1 (tolerant cultivar) and Northstar (sensitive cultivar) were used as the plant materials”
e7“SOD-Ⅱ,APX-Ⅰ,POD-Ⅲ and POD-Ⅳ were identified as sensitive isozyme bands to salt stress”
Claim · model-written summary
Tolerant alfalfa cultivar reduces damage through enhanced antioxidant protective ability under salt stress.
- Taxon
- alfalfaMedicago sativae1
- Material
- Tolerant alfalfa cultivare1
- Outcome
- damagee1
- Qualifier
- enhanced antioxidant protective abilitye1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Tolerant alfalfa cultivar can reduce the damage by enhanced antioxidant protective ability under salt stress”
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