Abstract
【Objective】 The research investigated the effects of Cr6+ on lipid peroxidation and ATPase activity of Sorghum Hybrid Sudangrass(Sorghum bicolor×S.Sudanense) seedling roots,and explored the toxic hazard of heavy metal Cr Stress on Plant.【Method】 The effects of different concentrations of Cr6+(0(CK),0.5,1.0,1.8 mmol/L K2CrO4) on the length and dry weight of roots,generating rate of O-·2,H2O2 and MDA content as well as plasma membrane relative permeability,activities of H+-ATPase,Ca2+-ATPase in the plasma membrane of Sorghum Hybrid Sudangrass seedlings roots were investigated.【Result】 Compared with the control,the length and dry weight of roots increased first and then decreased with the increase of concentrations of Cr6+,which resulted in significant increase of O-·2and H2O2 level and malondialdehyde(MDA)content as well as plasma membrane relative permeability in the roots(P0.05),and there was significantly positive correlation to Cr6+ treatment concentration.Moreover,the activity of H+-ATPase and Ca2+-ATPase had no obvious change(P0.05)under 0.5 mmol/L Cr6+concentration,but significantly decreased with 1.0,1.8 mmol/L Cr6+ stress(P0.05),a negative correlation was present between the level of membrance-lipid and the two enzyme.【Conclusion】 We concluded that there was unnoticeable change under low concentration of the Cr6+ in the activity of ATPase in Sorghum Hybrid Sudangrass seedlings roots plasma membrane,whereas it would dropped markedly and the root growth was repressed under relatively high Cr6+ stress.
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Claims 7
Claim · model-written summary
Root length and dry weight increased and then decreased with increasing Cr6+ concentration compared with the control.
Verbatim
e0“Compared with the control,the length and dry weight of roots increased first and then decreased with the increase of concentrations of Cr6+”
t0“Sorghum Hybrid Sudangrass (Sorghum bicolor × S. sudanense) roots”
Claim · model-written summary
Cr6+ caused a significant increase in superoxide, H2O2 and MDA content in the roots.
Verbatim
e0“Compared with the control,the length and dry weight of roots increased first and then decreased with the increase of concentrations of Cr6+”
e1“significant increase of O-·2and H2O2 level and malondialdehyde(MDA) content as well as plasma membrane relative permeability in the roots”
t0“Sorghum Hybrid Sudangrass (Sorghum bicolor × S. sudanense) roots”
Claim · model-written summary
Cr6+ caused a significant increase in plasma membrane relative permeability in the roots.
Verbatim
e0“Compared with the control,the length and dry weight of roots increased first and then decreased with the increase of concentrations of Cr6+”
e1“significant increase of O-·2and H2O2 level and malondialdehyde(MDA) content as well as plasma membrane relative permeability in the roots”
t0“Sorghum Hybrid Sudangrass (Sorghum bicolor × S. sudanense) roots”
Claim · model-written summary
Under 0.5 mmol/L Cr6+ the activities of H+-ATPase and Ca2+-ATPase showed no obvious change.
Verbatim
e0“Compared with the control,the length and dry weight of roots increased first and then decreased with the increase of concentrations of Cr6+”
e3“the activity of H+-ATPase and Ca2+-ATPase had no obvious change”
e4“under 0.5 mmol/L Cr6+concentration”
t0“Sorghum Hybrid Sudangrass (Sorghum bicolor × S. sudanense) roots”
Claim · model-written summary
H+-ATPase and Ca2+-ATPase activities decreased significantly under 1.0 and 1.8 mmol/L Cr6+ stress.
Verbatim
e0“Compared with the control,the length and dry weight of roots increased first and then decreased with the increase of concentrations of Cr6+”
e3“the activity of H+-ATPase and Ca2+-ATPase had no obvious change”
e5“significantly decreased with 1.0,1.8 mmol/L Cr6+ stress”
t0“Sorghum Hybrid Sudangrass (Sorghum bicolor × S. sudanense) roots”
Claim · model-written summary
The level of membrane lipid was negatively correlated with the two ATPase enzymes.
Verbatim
e6“a negative correlation was present between the level of membrance-lipid and the two enzyme”
t0“Sorghum Hybrid Sudangrass (Sorghum bicolor × S. sudanense) roots”
Claim · model-written summary
Cr6+ treatment concentration was significantly positively correlated with superoxide, H2O2 and MDA levels.
Verbatim
e7“significantly positive correlation to Cr6+ treatment concentration”
e1“significant increase of O-·2and H2O2 level and malondialdehyde(MDA) content as well as plasma membrane relative permeability in the roots”
t0“Sorghum Hybrid Sudangrass (Sorghum bicolor × S. sudanense) roots”