Abstract
Grass pea(Lathyrus sativus L.)seedlings cultured in hydroponic solution for 7days were used as experimental materials.Different concentrations of H2O2 were applied to hydroponic solution for 24 hto stress L.sativus seedlings.In order to reveal the tolerance mechanisms of oxidative stress in L.sativus roots,the extent of oxidative stress and the response of antioxidant system to oxidative stress were analyzed in roots.Results showed that:(1)The weight of fresh roots reduced significantly.However there was no significant change in the number of lateral roots with H2O2 concentration increasing.(2)The scope and extent of H2O2 staining was significantly increased,but the apical region always remained relatively low levels of H2O2.In contrast,the scope and extent of O-·2staining were significantly reduced and the apical region always maintained a high level of O-·2.(3)The content of ascorbic acid(ASC)and the activities of catalase(CAT),peroxidase(POD)and ascorbate peroxidase(APX)all exhibited a decrease trend after an initial increase.However,superoxide dismutase(SOD)has been showing an upward trend.The results above showed that O-·2accumulation could be positively related to the growth and vigor of L.sativus root and H2O2 accumulation could be positively related to the extent of oxidative stress.The studies also confirmed that low concentrations of H2O2 treatment could improve the scavenging ability of antioxidant system for ROS in L.sativus roots.
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Claims 12
Claim · model-written summary
Fresh root weight decreased significantly as H2O2 concentration increased.
Not reportedComparator
Verbatim
e0“The weight of fresh roots reduced significantly.”
e1“Different concentrations of H2O2 were applied to hydroponic solution for 24 hto stress L.sativus seedlings.”
t0“Grass Pea”
Claim · model-written summary
Lateral root number did not change significantly as H2O2 concentration increased.
Not reportedComparator
Verbatim
e0“there was no significant change in the number of lateral roots with H2O2 concentration increasing.”
t0“Grass Pea”
Claim · model-written summary
The extent of H2O2 staining increased significantly with H2O2 stress.
Not reportedComparator
Verbatim
e0“The scope and extent of H2O2 staining was significantly increased”
t0“Grass Pea”
Claim · model-written summary
H2O2 levels remained relatively low in the root apical region.
Verbatim
e0“the apical region always remained relatively low levels of H2O2”
t0“Grass Pea”
Claim · model-written summary
The extent of O-·2 staining decreased significantly.
Not reportedTreatmentComparator
Verbatim
e0“the scope and extent of O-·2staining were significantly reduced”
t0“Grass Pea”
Claim · model-written summary
The apical region maintained a high level of O-·2.
Verbatim
e0“the apical region always maintained a high level of O-·2”
t0“Grass Pea”
Claim · model-written summary
Ascorbic acid content rose initially and then declined after stress.
- Taxon
- Grass Peat0
- Outcome
- content of ascorbic acid(ASC)e0
- Direction
- a decrease trend after an initial increasee0
Not reportedTreatmentComparator
Verbatim
e0“The content of ascorbic acid(ASC)and the activities of catalase(CAT),peroxidase(POD)and ascorbate peroxidase(APX)all exhibited a decrease trend after an initial increase.”
t0“Grass Pea”
Claim · model-written summary
Catalase, peroxidase and ascorbate peroxidase activities rose initially and then declined.
- Taxon
- Grass Peat0
- Outcome
- activities of catalase(CAT),peroxidase(POD)and ascorbate peroxidase(APX)e0
- Direction
- a decrease trend after an initial increasee0
Not reportedTreatmentComparator
Verbatim
e0“the activities of catalase(CAT),peroxidase(POD)and ascorbate peroxidase(APX)all exhibited a decrease trend after an initial increase.”
t0“Grass Pea”
Claim · model-written summary
Superoxide dismutase showed an upward trend.
Not reportedTreatmentComparator
Verbatim
e0“superoxide dismutase(SOD)has been showing an upward trend”
t0“Grass Pea”
Claim · model-written summary
O-·2 accumulation was positively related to root growth and vigor.
Verbatim
e0“O-·2accumulation could be positively related to the growth and vigor of L.sativus root”
t0“Grass Pea”
Claim · model-written summary
H2O2 accumulation was positively related to oxidative stress extent.
Verbatim
e0“H2O2 accumulation could be positively related to the extent of oxidative stress”
t0“Grass Pea”
Claim · model-written summary
Low H2O2 concentrations improved antioxidant scavenging ability for ROS in roots.
- Taxon
- Grass Peat0
- Treatment
- low concentrations of H2O2 treatmente0
- Outcome
- scavenging ability of antioxidant system for ROSe0
- Direction
- improvee0
Not reportedComparator
Verbatim
e0“low concentrations of H2O2 treatment could improve the scavenging ability of antioxidant system for ROS in L.sativus roots”
t0“Grass Pea”