Abstract
Silicon (Si) has been known to improve salt tolerance in plants. In this study, 4-weeks-old alfalfa seedlings were exposed to various concentrations of external NaCl (0-200mM) with or without 2mM Si in the form of sodium metasilicate Na2SiO3•5H2O for 2 weeks. The results showed that NaCl-stressed plants showed a decrease in growth parameters, stem extension rate, predawn leaf water potential (LWP) and the chlorophyll content, potassium (K+) concentration, as well as potassium/sodium ion (K+/Na+) ratio. By contrast, NaCl-stressed plants increased the Na+ concentration and malondialdehyde (MDA) level, as well as the activities of superoxide dismutase (SOD), catalase (CAT) and peroxidase (POD) in alfalfa leaves. On the other hand, exogenously applied Si enhanced photosynthesis parameters of NaCl-stressed plants, which was accompanied by the enhancement in predawn LWP, level of chlorophyll content and WUE, The Si-treated plants displayed enhanced salinity tolerance by limiting Na+ accumulation while maintaining K+ concentration in leaves, the increased K+/Na+ radio established an ion homoeostasis to protect the leaves from toxic Na+ and thereby maintained higher chlorophyll retention. Simultaneously, Si-treated plants showed higher antioxidant activities and decreased MDA level under salt stress. It is concluded that Si enhanced salt tolerance of alfalfa though improving the leaves photosynthesis by enhancing antioxidant performance and maintaining ion homoeostasis in leaves. Take together, our data showed that exogenous silicon application could be effectively manipulated for improving salt tolerance of alfalfa grown in saline soil.
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Claims 12
Claim · model-written summary
Salt stress decreased alfalfa growth parameters and stem extension rate.
- Taxon
- alfalfa
Medicago sativae1 - Treatment
- NaCl (0-200mM)e1
- Outcome
- growth parameters, stem extension ratee0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“NaCl-stressed plants showed a decrease in growth parameters, stem extension rate”
e1“alfalfa seedlings were exposed to various concentrations of external NaCl (0-200mM)”
Claim · model-written summary
Salt stress decreased predawn leaf water potential, chlorophyll content, potassium concentration, and potassium/sodium ratio.
- Taxon
- alfalfaMedicago sativae1
- Treatment
- NaCl (0-200mM)e1
- Outcome
- predawn leaf water potential (LWP) and the chlorophyll content, potassium (K+) concentratione0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a decrease in growth parameters, stem extension rate, predawn leaf water potential (LWP) and the chlorophyll content, potassium (K+) concentration, as well as potassium/sodium ion (K+/Na+) ratio”
e1“alfalfa seedlings were exposed to various concentrations of external NaCl (0-200mM)”
Claim · model-written summary
Salt stress increased leaf sodium concentration and malondialdehyde level.
- Taxon
- alfalfaMedicago sativae1
- Treatment
- NaCl-stressede0
- Outcome
- Na+ concentration and malondialdehyde (MDA) levele0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“NaCl-stressed plants increased the Na+ concentration and malondialdehyde (MDA) level”
e1“alfalfa leaves”
Claim · model-written summary
Salt stress increased superoxide dismutase, catalase, and peroxidase activities in alfalfa leaves.
- Taxon
- alfalfaMedicago sativae0
- Treatment
- NaCl-stressede1
- Outcome
- activities of superoxide dismutase (SOD), catalase (CAT) and peroxidase (POD)e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased the Na+ concentration and malondialdehyde (MDA) level, as well as the activities of superoxide dismutase (SOD), catalase (CAT) and peroxidase (POD) in alfalfa leaves”
e1“NaCl-stressed plants increased the Na+ concentration”
Claim · model-written summary
Exogenous silicon enhanced photosynthesis parameters in salt-stressed alfalfa.
- Taxon
- alfalfaMedicago sativae1
- Treatment
- 2mM Sie2
- Outcome
- photosynthesis parameterse0
- Direction
- enhancede0
- Comparator
- without 2mM Sie2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“exogenously applied Si enhanced photosynthesis parameters of NaCl-stressed plants”
e1“alfalfa seedlings”
e2“with or without 2mM Si”
Claim · model-written summary
Silicon enhanced predawn leaf water potential, chlorophyll content, and water use efficiency under salt stress.
- Taxon
- alfalfaMedicago sativae1
- Treatment
- 2mM Sie2
- Outcome
- predawn LWP, level of chlorophyll content and WUEe0
- Direction
- enhancemente0
- Comparator
- without 2mM Sie2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“enhancement in predawn LWP, level of chlorophyll content and WUE”
e1“alfalfa seedlings”
e2“with or without 2mM Si”
Claim · model-written summary
Silicon limited sodium accumulation in alfalfa leaves under salt stress.
- Taxon
- alfalfaMedicago sativae1
- Treatment
- 2mM Sie2
- Outcome
- Na+ accumulatione0
- Direction
- limitinge0
- Comparator
- without 2mM Sie2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Si-treated plants displayed enhanced salinity tolerance by limiting Na+ accumulation”
e1“alfalfa leaves”
e2“with or without 2mM Si”
Claim · model-written summary
Silicon maintained leaf potassium concentration under salt stress.
- Taxon
- alfalfaMedicago sativae1
- Treatment
- 2mM Sie2
- Outcome
- K+ concentration in leavese0
- Direction
- maintaininge0
- Comparator
- without 2mM Sie2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“maintaining K+ concentration in leaves”
e1“alfalfa seedlings”
e2“with or without 2mM Si”
Claim · model-written summary
Silicon increased the leaf potassium/sodium ratio under salt stress.
- Taxon
- alfalfaMedicago sativae1
- Treatment
- 2mM Sie2
- Outcome
- K+/Na+ radioe0
- Direction
- increasede0
- Comparator
- without 2mM Sie2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the increased K+/Na+ radio established an ion homoeostasis”
e1“alfalfa seedlings”
e2“with or without 2mM Si”
Claim · model-written summary
Silicon-treated plants had higher antioxidant activities under salt stress.
- Taxon
- alfalfaMedicago sativae1
- Treatment
- 2mM Sie2
- Outcome
- antioxidant activitiese0
- Direction
- highere0
- Comparator
- without 2mM Sie2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Si-treated plants showed higher antioxidant activities and decreased MDA level under salt stress”
e1“alfalfa seedlings”
e2“with or without 2mM Si”
Claim · model-written summary
Silicon-treated plants had lower malondialdehyde under salt stress.
- Taxon
- alfalfaMedicago sativae1
- Treatment
- 2mM Sie2
- Outcome
- MDA levele0
- Direction
- decreasede0
- Comparator
- without 2mM Sie2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Si-treated plants showed higher antioxidant activities and decreased MDA level under salt stress”
e1“alfalfa seedlings”
e2“with or without 2mM Si”
Claim · model-written summary
The authors propose exogenous silicon application to improve salt tolerance of alfalfa in saline soil.
- Taxon
- alfalfaMedicago sativae0
- Outcome
- exogenous silicon applicatione0
- Setting
- saline soile0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“exogenous silicon application could be effectively manipulated for improving salt tolerance of alfalfa grown in saline soil”
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See all 5 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.