Abstract
Lipid peroxidation resulting from loss of free radical scavenging is thought to be involved in deterioration of sunflower ( Helianthus annuus L.) seeds during accelerated ageing. In other respects, presoaking of seeds in a solution of low water potential (osmopriming) has been demonstrated to reinvigorate aged seeds. The aim of the present work was to study the effect of osmopriming on the germination of aged sunflower seeds and to investigate whether this effect was associated with the restoration of antioxidant defence systems. Seeds were aged for 5 days at 45°C and 100% relative humidity and then primed for various durations up to 7 days at 15°C in a solution of polyethylene glycol 6000 at −2 MPa. Lipid peroxidation was estimated by measuring malondialdehyde (MDA) and conjugated diene contents, and the activities of superoxide dismutase (SOD), catalase (CAT), glutathione reductase (GR), ascorbate peroxidase (APX) and dehydroascorbate reductase (DHAR) were measured throughout the treatments. Accelerated ageing resulted in a marked decrease in the germination rate, and was associated with an increase in the levels of MDA and conjugated dienes, thus indicating lipid peroxidation. Ageing was also characterized by a decrease in the activities of CAT and GR. The activities of SOD and DHAR were much less altered. No APX activity was detected whatever the seed treatment. Priming of aged seeds progressively restored the initial germinative ability and resulted in a marked decrease in the levels of MDA and conjugated dienes, indicating a fall in lipid peroxidation processes. These effects of priming were also well correlated to the recovery of SOD, CAT and GR activities. Priming treatment for 7 days led to full restoration of the cell detoxifying mechanisms which were strongly altered during ageing. Glutathione content showed the same changes as GR activity. There existed a clear‐cut relationship between seed germinative energy, expressed as the germination rate, and the efficiency of free radical scavenging systems, in particular CAT and GR activities and glutathione content. The results suggest that the antioxidant defence systems might play a key role in seed vigour.
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Claims 12
Claim · model-written summary
Accelerated ageing markedly decreased the germination rate of sunflower seeds.
- Taxon
- sunflower
Helianthus annuust0 - Treatment
- Accelerated ageinge1
- Outcome
- germination ratee1
- Direction
- decreasee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Accelerated ageing resulted in a marked decrease in the germination rate”
t0“sunflower seeds”
Claim · model-written summary
Accelerated ageing was associated with increased levels of MDA and conjugated dienes.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- Accelerated ageinge1
- Outcome
- levels of MDA and conjugated dienese2
- Direction
- increasee2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“was associated with an increase in the levels of MDA and conjugated dienes”
e1“Accelerated ageing resulted in a marked decrease in the germination rate”
t0“sunflower seeds”
Claim · model-written summary
Ageing decreased the activities of CAT and GR.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- Ageinge3
- Outcome
- activities of CAT and GRe3
- Direction
- decreasee3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“Ageing was also characterized by a decrease in the activities of CAT and GR”
t0“sunflower seeds”
Claim · model-written summary
The activities of SOD and DHAR were much less altered by ageing.
- Taxon
- sunflowerHelianthus annuust0
- Outcome
- activities of SOD and DHARe4
- Qualifier
- much less alterede4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“The activities of SOD and DHAR were much less altered”
t0“sunflower seeds”
Claim · model-written summary
No APX activity was detected in any seed treatment.
- Taxon
- sunflowerHelianthus annuust0
- Outcome
- APX activitye5
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“No APX activity was detected whatever the seed treatment”
t0“sunflower seeds”
Claim · model-written summary
Priming of aged seeds progressively restored the initial germinative ability.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- Priminge6
- Outcome
- initial germinative abilitye6
- Direction
- restorede6
- Comparator
- aged seedse6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“Priming of aged seeds progressively restored the initial germinative ability”
t0“sunflower seeds”
Claim · model-written summary
Priming of aged seeds markedly decreased the levels of MDA and conjugated dienes.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- Priminge2
- Outcome
- levels of MDA and conjugated dienese7
- Direction
- decreasee7
- Comparator
- aged seedse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“resulted in a marked decrease in the levels of MDA and conjugated dienes”
e2“Priming of aged seeds”
t0“sunflower seeds”
Claim · model-written summary
Priming for 7 days fully restored the cell detoxifying mechanisms that were altered during ageing.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- Priming treatment for 7 dayse1
- Outcome
- cell detoxifying mechanismse1
- Direction
- full restoratione1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Priming treatment for 7 days led to full restoration of the cell detoxifying mechanisms which were strongly altered during ageing”
t0“sunflower seeds”
Claim · model-written summary
Priming effects were well correlated with the recovery of SOD, CAT and GR activities.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- priminge1
- Outcome
- SOD, CAT and GR activitiese1
- Direction
- recoverye1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“These effects of priming were also well correlated to the recovery of SOD, CAT and GR activities”
t0“sunflower seeds”
Claim · model-written summary
Glutathione content showed the same changes as GR activity.
- Taxon
- sunflowerHelianthus annuust0
- Outcome
- Glutathione contente1
- Qualifier
- the same changes as GR activitye1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Glutathione content showed the same changes as GR activity”
t0“sunflower seeds”
Claim · model-written summary
Seed germination rate was related to the efficiency of free radical scavenging, in particular CAT and GR activities and glutathione content.
- Taxon
- sunflowerHelianthus annuust0
- Compound
- glutathionee1
- Outcome
- germination ratee1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“There existed a clear‐cut relationship between seed germinative energy, expressed as the germination rate, and the efficiency of free radical scavenging systems, in particular CAT and GR activities and glutathione content”
t0“sunflower seeds”
Claim · model-written summary
Antioxidant defence systems might play a key role in seed vigour.
- Taxon
- sunflowerHelianthus annuust0
- Outcome
- seed vigoure1
- Qualifier
- antioxidant defence systemse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The results suggest that the antioxidant defence systems might play a key role in seed vigour”
t0“sunflower seeds”
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See all 14 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.