Abstract
Abstract The perennial Medicago sativa cv. Gabès is widely grown on saline soils in Tunisian oases. The mechanisms by which this NaCl‐tolerant cultivar maintains a positive growth balance were analyzed. In this plant of considerable agronomic interest, biochemical analyses were conducted in order to study the effects of salinity on mature leaves. Free‐radical detoxification mechanisms and changes induced by the accumulation of reactive oxygen species (ROS) in response to the NaCl stress were compared between the upper (young) and lower (old) carbohydrate source leaves. Long‐term NaCl (150 mM) treatment significantly reduced the size of source leaves supporting growth. Salinity damage was greater in the lower than in the upper leaves. This damage was associated with a high Na + : K + ratio and a decrease in the activity of H 2 O 2 ‐scavenging enzymes, leading to lipid peroxidation. In lower source leaves that were mainly affected by ionic stress, superoxide dismutase (SOD) was overexpressed and guaiacol peroxidase (GPX) activity increased. In contrast, in upper source leaves that were mainly exposed to water deficit, catalase and ascorbate peroxidase (APX) activities increased whereas GPX activity was unchanged. The upper source leaves maintained adequate ionic and water status and an efficient ROS detoxification, allowing sinks to be supplied with photoassimilates and maintaining a positive growth balance in this cultivar of alfalfa.
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Claims 9
Claim · model-written summary
Long-term 150 mM NaCl significantly reduced the size of source leaves of alfalfa.
- Taxon
- Medicago sativa
Medicago sativae0 - Material
- cv. Gabèse0
- Organ / stage
- source leavese1
- Treatment
- Long-term NaCl (150 mM)e1
- Outcome
- size of source leavese1
- Direction
- reducede1
- Setting
- saline soils in Tunisian oasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The perennial Medicago sativa cv. Gabès is widely grown on saline soils in Tunisian oases”
e1“Long-term NaCl (150 mM) treatment significantly reduced the size of source leaves supporting growth”
Claim · model-written summary
Salinity damage was greater in lower than in upper leaves.
- Taxon
- Medicago sativaMedicago sativae0
- Organ / stage
- leavese2
- Treatment
- Salinitye2
- Outcome
- damagee2
- Direction
- greatere2
- Comparator
- upper leavese2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The perennial Medicago sativa cv. Gabès is widely grown on saline soils in Tunisian oases”
e2“Salinity damage was greater in the lower than in the upper leaves”
Claim · model-written summary
Salinity damage in alfalfa was associated with decreased activity of H2O2-scavenging enzymes.
- Taxon
- Medicago sativaMedicago sativae0
- Material
- cv. Gabèse0
- Outcome
- activity of H 2 O 2 ‐scavenging enzymese3
- Direction
- decreasee3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The perennial Medicago sativa cv. Gabès is widely grown on saline soils in Tunisian oases”
e3“This damage was associated with a high Na + : K + ratio and a decrease in the activity of H 2 O 2 ‐scavenging enzymes”
Claim · model-written summary
Salinity damage in alfalfa was associated with a high Na+:K+ ratio.
- Taxon
- Medicago sativaMedicago sativae0
- Compound
- Na + : K + ratioe3
- Outcome
- damagee3
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The perennial Medicago sativa cv. Gabès is widely grown on saline soils in Tunisian oases”
e3“This damage was associated with a high Na + : K + ratio and a decrease in the activity of H 2 O 2 ‐scavenging enzymes”
Claim · model-written summary
In lower source leaves under ionic stress, superoxide dismutase was overexpressed.
- Taxon
- Medicago sativaMedicago sativae0
- Organ / stage
- lower source leavese4
- Treatment
- ionic stresse4
- Outcome
- superoxide dismutase (SOD)e4
- Direction
- overexpressede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The perennial Medicago sativa cv. Gabès is widely grown on saline soils in Tunisian oases”
e4“In lower source leaves that were mainly affected by ionic stress, superoxide dismutase (SOD) was overexpressed and guaiacol peroxidase (GPX) activity increased”
Claim · model-written summary
In lower source leaves under ionic stress, guaiacol peroxidase activity increased.
- Taxon
- Medicago sativaMedicago sativae0
- Organ / stage
- lower source leavese4
- Treatment
- ionic stresse4
- Outcome
- guaiacol peroxidase (GPX) activitye4
- Direction
- increasede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The perennial Medicago sativa cv. Gabès is widely grown on saline soils in Tunisian oases”
e4“In lower source leaves that were mainly affected by ionic stress, superoxide dismutase (SOD) was overexpressed and guaiacol peroxidase (GPX) activity increased”
Claim · model-written summary
In upper source leaves under water deficit, catalase and APX activities increased.
- Taxon
- Medicago sativaMedicago sativae0
- Organ / stage
- upper source leavese5
- Treatment
- water deficite5
- Outcome
- catalase and ascorbate peroxidase (APX) activitiese5
- Direction
- increasede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The perennial Medicago sativa cv. Gabès is widely grown on saline soils in Tunisian oases”
e5“In contrast, in upper source leaves that were mainly exposed to water deficit, catalase and ascorbate peroxidase (APX) activities increased”
Claim · model-written summary
Guaiacol peroxidase activity was unchanged in upper source leaves under water deficit.
- Taxon
- Medicago sativaMedicago sativae0
- Organ / stage
- upper source leavese5
- Treatment
- water deficite5
- Outcome
- GPX activitye6
- Direction
- unchangede6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The perennial Medicago sativa cv. Gabès is widely grown on saline soils in Tunisian oases”
e5“In contrast, in upper source leaves that were mainly exposed to water deficit, catalase and ascorbate peroxidase (APX) activities increased”
e6“whereas GPX activity was unchanged”
Claim · model-written summary
Upper source leaves maintained a positive growth balance in this alfalfa cultivar.
- Taxon
- alfalfaMedicago sativae7
- Outcome
- growth balancee7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“maintaining a positive growth balance in this cultivar of alfalfa”
The same questions in other papers
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- negative
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- positive
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See all 13 papers →salinity · pest · Medicago sativa (alfalfa)Results agree
3 papers in the same direction as this paper
- negative
- negative
- no effect
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.