Abstract
The effects of selenium(Se)on leaf senescence and antioxidase system in Pyrus bretschneider‘Dangshan Suli’were studied after fruit harvested. The results showed that:Spraying lower Se dosage(5 mg · L-1)delayed the decrease of water content,dry weight per unit area,chlorophyll and soluble protein content significantly,increased the activities of SOD and GSH-Px,decreased the content of H2O2, and MDA significantly in the senescing leaves,thereby deferred leaf senescence about 7.25 days;But the medium(10 mg · L-1)and higher Se dosage(20 mg · L-1)were not so effective in deferring leaf senescence,the higher the dosage,the lower the effect;However,Se inhibited POD activity. Therefore,the effect of Se on leaf senescence varied depending on its dosage,lower Se dosage may be involved in leaf-senescing regulation by enhancing the activities of SOD and GSH-Px,as a result decreases the membrane lipid peroxidation,postpones the functional period of the leaves.
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Claims 10
Claim · model-written summary
Lower Se dosage (5 mg/L) sprayed on pear leaves significantly delayed the decrease of water content, dry weight per unit area and chlorophyll content.
- Taxon
- Pyrus bretschneider‘Dangshan Suli’t0
- Treatment
- Spraying lower Se dosage(5 mg · L-1)e1
- Outcome
- water content,dry weight per unit area,chlorophylle1
- Direction
- delayed the decrease ofe1
Not reportedComparator
Verbatim
t0“Pyrus bretschneider‘Dangshan Suli’”
e1“Spraying lower Se dosage(5 mg · L-1)delayed the decrease of water content,dry weight per unit area,chlorophyll and soluble protein content significantly”
Claim · model-written summary
Lower Se dosage (5 mg/L) significantly delayed the decrease of soluble protein content in senescing pear leaves.
- Taxon
- Pyrus bretschneider‘Dangshan Suli’t0
- Treatment
- Spraying lower Se dosage(5 mg · L-1)e1
- Outcome
- soluble protein contente1
- Direction
- delayed the decrease ofe1
Not reportedComparator
Verbatim
t0“Pyrus bretschneider‘Dangshan Suli’”
e1“Spraying lower Se dosage(5 mg · L-1)delayed the decrease of water content,dry weight per unit area,chlorophyll and soluble protein content significantly”
Claim · model-written summary
Lower Se dosage (5 mg/L) increased the activities of SOD and GSH-Px in senescing pear leaves.
- Taxon
- Pyrus bretschneider‘Dangshan Suli’t0
- Treatment
- Spraying lower Se dosage(5 mg · L-1)e1
- Gene
- SOD and GSH-Pxe2
- Outcome
- activities of SOD and GSH-Pxe2
- Direction
- increasede2
Not reportedComparator
Verbatim
t0“Pyrus bretschneider‘Dangshan Suli’”
e1“Spraying lower Se dosage(5 mg · L-1)delayed the decrease of water content,dry weight per unit area,chlorophyll and soluble protein content significantly”
e2“increased the activities of SOD and GSH-Px”
Claim · model-written summary
Lower Se dosage (5 mg/L) significantly decreased H2O2 and MDA content in senescing pear leaves.
- Taxon
- Pyrus bretschneider‘Dangshan Suli’t0
- Organ / stage
- senescing leavese3
- Treatment
- Spraying lower Se dosage(5 mg · L-1)e1
- Outcome
- content of H2O2, and MDAe3
- Direction
- decreasede3
Not reportedComparator
Verbatim
t0“Pyrus bretschneider‘Dangshan Suli’”
e1“Spraying lower Se dosage(5 mg · L-1)delayed the decrease of water content,dry weight per unit area,chlorophyll and soluble protein content significantly”
e3“decreased the content of H2O2, and MDA significantly in the senescing leaves”
Claim · model-written summary
Lower Se dosage (5 mg/L) deferred leaf senescence by about 7.25 days.
- Taxon
- Pyrus bretschneider‘Dangshan Suli’t0
- Treatment
- Spraying lower Se dosage(5 mg · L-1)e1
- Outcome
- leaf senescencee4
- Direction
- deferrede4
- Value
- 7.25 dayse4
Not reportedComparator
Verbatim
t0“Pyrus bretschneider‘Dangshan Suli’”
e1“Spraying lower Se dosage(5 mg · L-1)delayed the decrease of water content,dry weight per unit area,chlorophyll and soluble protein content significantly”
e4“thereby deferred leaf senescence about 7.25 days”
Claim · model-written summary
Medium Se dosage (10 mg/L) was not so effective in deferring leaf senescence.
- Taxon
- Pyrus bretschneider‘Dangshan Suli’t0
- Treatment
- medium(10 mg · L-1)e5
- Outcome
- deferring leaf senescencee5
- Direction
- not so effectivee5
Not reportedComparator
Verbatim
t0“Pyrus bretschneider‘Dangshan Suli’”
e5“But the medium(10 mg · L-1)and higher Se dosage(20 mg · L-1)were not so effective in deferring leaf senescence”
Claim · model-written summary
Higher Se dosage (20 mg/L) was not so effective in deferring leaf senescence.
- Taxon
- Pyrus bretschneider‘Dangshan Suli’t0
- Treatment
- higher Se dosage(20 mg · L-1)e5
- Outcome
- deferring leaf senescencee5
- Direction
- not so effectivee5
Not reportedComparator
Verbatim
t0“Pyrus bretschneider‘Dangshan Suli’”
e5“But the medium(10 mg · L-1)and higher Se dosage(20 mg · L-1)were not so effective in deferring leaf senescence”
Claim · model-written summary
The higher the Se dosage, the lower its effect on leaf senescence.
Verbatim
t0“Pyrus bretschneider‘Dangshan Suli’”
e6“the higher the dosage,the lower the effect”
Claim · model-written summary
Se inhibited peroxidase (POD) activity in pear leaves.
Not reportedComparator
Verbatim
t0“Pyrus bretschneider‘Dangshan Suli’”
e7“However,Se inhibited POD activity”
Claim · model-written summary
Lower Se dosage may regulate leaf senescence by enhancing SOD and GSH-Px activities, which decreases membrane lipid peroxidation.
Verbatim
t0“Pyrus bretschneider‘Dangshan Suli’”
e0“lower Se dosage may be involved in leaf-senescing regulation by enhancing the activities of SOD and GSH-Px,as a result decreases the membrane lipid peroxidation”