Abstract
delta-aminolevulinic acid (ALA) is the obligatory precursor for tetrapyrroles and for chlorophylls in plants. Under illumination, these photosensitizers generate singlet oxygen, thus causing bleaching and death of treated tissues. We have examined whether superoxide is involved in the mode of action of ALA and whether SOD provides protection. Bean genotypes with similar carotenoid content but differing in SOD activity and cucumber seedlings were used throughout. Cucumber plants treated with 10 mM ethanolamine (EA) prior to ALA, had higher levels of chlorophyll fluorescence and lower values of electrolyte leakage than control. Bean cultivars with high SOD activity were considerably more tolerant to membrane damage caused by ALA than those with low SOD activity. SOD activity was greatly reduced in cucumber leaves treated with diethyldithiocarbamate (DDTC). Electrolyte leakage was markedly increased and chlorophyll fluorescence values were significantly lower in DDTC and ALA treated tissues as compared with those treated with ALA only. The results indicate that superoxide is involved in the toxicity caused by ALA and that, by breeding for high SOD activity, resistance to ALA can be achieved, thus allowing the use of ALA as a selective herbicide in the field.
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Claims 8
Claim · model-written summary
Ethanolamine pretreatment increased cucumber chlorophyll fluorescence after ALA.
- Taxon
- Cucumber
Cucumis sativuse0 - Treatment
- 10 mM ethanolamine (EA) prior to ALAe0
- Outcome
- chlorophyll fluorescencee0
- Direction
- highere0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cucumber plants treated with 10 mM ethanolamine (EA) prior to ALA, had higher levels of chlorophyll fluorescence and lower values of electrolyte leakage than control”
Claim · model-written summary
Ethanolamine pretreatment reduced cucumber electrolyte leakage after ALA.
- Taxon
- CucumberCucumis sativuse0
- Treatment
- 10 mM ethanolamine (EA) prior to ALAe0
- Outcome
- electrolyte leakagee0
- Direction
- lowere0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cucumber plants treated with 10 mM ethanolamine (EA) prior to ALA, had higher levels of chlorophyll fluorescence and lower values of electrolyte leakage than control”
Claim · model-written summary
High SOD bean cultivars tolerated ALA membrane damage better than low SOD cultivars.
Verbatim
e0“Bean cultivars with high SOD activity were considerably more tolerant to membrane damage caused by ALA than those with low SOD activity”
Claim · model-written summary
DDTC reduced SOD activity in cucumber leaves.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- diethyldithiocarbamate (DDTC)e0
- Gene
- SODe0
- Outcome
- SOD activitye0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“SOD activity was greatly reduced in cucumber leaves treated with diethyldithiocarbamate (DDTC)”
Claim · model-written summary
DDTC and ALA increased electrolyte leakage versus ALA alone.
Verbatim
e0“Electrolyte leakage was markedly increased and chlorophyll fluorescence values were significantly lower in DDTC and ALA treated tissues as compared with those treated with ALA only”
t0“Plants”
Claim · model-written summary
DDTC and ALA lowered chlorophyll fluorescence versus ALA alone.
Verbatim
e0“Electrolyte leakage was markedly increased and chlorophyll fluorescence values were significantly lower in DDTC and ALA treated tissues as compared with those treated with ALA only”
t0“Plants”
Claim · model-written summary
Authors infer superoxide contributes to ALA toxicity.
- Taxon
- PlantsViridiplantaet0
- Compound
- superoxidee0
- Outcome
- toxicity caused by ALAe0
Verbatim
e0“The results indicate that superoxide is involved in the toxicity caused by ALA”
t0“Plants”
Claim · model-written summary
Authors suggest breeding high SOD activity for ALA resistance as a selective herbicide.
- Taxon
- PlantsViridiplantaet0
- Gene
- SODe0
- Outcome
- resistance to ALA can be achievede0
Verbatim
e0“by breeding for high SOD activity, resistance to ALA can be achieved, thus allowing the use of ALA as a selective herbicide in the field”
t0“Plants”
The same questions in other papers
5-aminolevulinic acid · physiology: photosynthesis · Cucumis sativus (cucumber)Results agree
3 papers in the same direction as this paper
- positive
- positive
- positive
5-aminolevulinic acid · physiology: oxidative · Cucumis sativus (cucumber)Results agree
7 papers in the same direction as this paper
- positive
- positive
- positive
4 papers more in this group
See all 8 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.