Abstract
The potential of 5-aminolevulenic acid (ALA) to enhance the salt tolerance of cucumber (Cucumis sativus L.) seedlings was investigated. ALA was applied at various concentrations (0, 1, 10, 25, 50, and 100 mg dm-3) as foliar spray or root watering. Then the seedlings were exposed to 0 or 75 mM NaCl for 5 d. NaCl stress reduced the root and leaf dry masses, leaf area, and the leaf net CO2 assimilation rate. These reductions were counteracted by exogenous ALA, and the most efficient was 50 mg dm-3 concentration via foliar spray. ALA decreased the H2O2 contents and increased the activities of ascorbate peroxidase (APX) and glutathione reductase (GR) in NaCl-treated cucumber roots and leaves and the activity of catalase (CAT) in leaves. The ALA application also up-regulated the expressions of CAT and cAPX genes in roots and leaves and the expression of GR gene in roots of the NaCl treated cucumber plants.
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Claims 7
Claim · model-written summary
NaCl stress reduced cucumber root and leaf dry mass, leaf area and net CO2 assimilation.
- Taxon
- cucumber
Cucumis sativuse1 - Treatment
- NaCl stresse0
- Outcome
- root and leaf dry masses, leaf area, and the leaf net CO2 assimilation ratee0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“NaCl stress reduced the root and leaf dry masses, leaf area, and the leaf net CO2 assimilation rate.”
e1“cucumber (Cucumis sativus L.) seedlings”
Claim · model-written summary
Exogenous ALA counteracted the NaCl-induced reductions, most efficiently at 50 mg dm-3 as a foliar spray.
- Taxon
- cucumberCucumis sativuse1
- Treatment
- 50 mg dm-3 concentration via foliar spraye0
- Outcome
- These reductionse0
- Direction
- counteractede0
- Value
- 50 mg dm-3e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These reductions were counteracted by exogenous ALA, and the most efficient was 50 mg dm-3 concentration via foliar spray.”
e1“cucumber (Cucumis sativus L.) seedlings”
Claim · model-written summary
ALA decreased H2O2 content in NaCl-treated cucumber roots and leaves.
- Taxon
- cucumberCucumis sativuse0
- Organ / stage
- roots and leavese0
- Treatment
- ALAe0
- Outcome
- H2O2 contentse0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ALA decreased the H2O2 contents and increased the activities of ascorbate peroxidase (APX) and glutathione reductase (GR) in NaCl-treated cucumber roots and leaves”
Claim · model-written summary
ALA increased APX and GR activities in NaCl-treated cucumber roots and leaves.
- Taxon
- cucumberCucumis sativuse0
- Organ / stage
- roots and leavese0
- Treatment
- ALAe0
- Gene
- ascorbate peroxidase (APX) and glutathione reductase (GR)e0
- Outcome
- activities of ascorbate peroxidase (APX) and glutathione reductase (GR)e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ALA decreased the H2O2 contents and increased the activities of ascorbate peroxidase (APX) and glutathione reductase (GR) in NaCl-treated cucumber roots and leaves”
Claim · model-written summary
ALA increased catalase activity in cucumber leaves.
- Taxon
- cucumberCucumis sativuse1
- Treatment
- ALAe1
- Gene
- catalase (CAT)e0
- Outcome
- activity of catalase (CAT) in leavese0
- Direction
- increasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the activity of catalase (CAT) in leaves”
e1“ALA decreased the H2O2 contents and increased the activities of ascorbate peroxidase (APX) and glutathione reductase (GR) in NaCl-treated cucumber roots and leaves and the activity of catalase (CAT) in leaves”
Claim · model-written summary
ALA up-regulated CAT and cAPX expression in roots and leaves of NaCl-treated cucumber.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- ALAe0
- Gene
- CAT and cAPX genese0
- Outcome
- expressions of CAT and cAPX genes in roots and leavese0
- Direction
- up-regulatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The ALA application also up-regulated the expressions of CAT and cAPX genes in roots and leaves and the expression of GR gene in roots of the NaCl treated cucumber plants.”
Claim · model-written summary
ALA up-regulated GR expression in roots of NaCl-treated cucumber.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- ALAe0
- Gene
- GR genee0
- Outcome
- expression of GR gene in rootse0
- Direction
- up-regulatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The ALA application also up-regulated the expressions of CAT and cAPX genes in roots and leaves and the expression of GR gene in roots of the NaCl treated cucumber plants.”
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