Abstract
SummaryBarley seeds (3·6 per cent moisture content) were irradiated in vacuo with 45 krads of gamma-rays and were then subjected to treatments such as wet heat shock (at 60°C for 90 sec) or oxygenated or oxygen-free hydration (at 0 to 2°C for 13 hours) in the presence or absence of caffeine. A combination of heat shock and oxygen-free hydration was found to be most protective against the post-irradiation oxygen-dependent damage (scored as seedling-injury and chromosomal aberrations). The presence of caffeine in oxygenated water prevents part of the oxygen-enhanced damage; however, the magnitude of such protection decreases after a wet heat shock to the seeds. On the other hand, caffeine counteracts the protective action of oxygen-free hydration; the role of heat shock, in this case, is to accentuate further the caffeine-induced radio-sensitization. These observations imply that the reactivity of caffeine towards the gamma-induced intermediate and end-products under oxic and anoxic conditions could be very different. The manner of influence of heat shock on the caffeine effect in the irradiated seeds remains to be elucidated.
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Claims 6
Claim · model-written summary
A combination of heat shock and oxygen-free hydration was most protective against post-irradiation oxygen-dependent damage in barley seeds.
- Taxon
- Barley
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Hordeum vulgaree0 - Organ / stage
- seedse0
- Treatment
- combination of heat shock and oxygen-free hydratione1
- Outcome
- post-irradiation oxygen-dependent damagee1
- Direction
- most protectivee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Barley seeds (3·6 per cent moisture content)”
e1“A combination of heat shock and oxygen-free hydration was found to be most protective against the post-irradiation oxygen-dependent damage”
Claim · model-written summary
Caffeine in oxygenated water partly prevented the oxygen-enhanced damage in barley seeds.
- Taxon
- BarleyHordeum vulgaree0
- Treatment
- presence of caffeine in oxygenated watere2
- Outcome
- oxygen-enhanced damagee2
- Direction
- preventse2
- Qualifier
- part ofe2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Barley seeds (3·6 per cent moisture content)”
e2“The presence of caffeine in oxygenated water prevents part of the oxygen-enhanced damage”
Claim · model-written summary
Wet heat shock decreased the magnitude of caffeine protection in irradiated barley seeds.
- Taxon
- BarleyHordeum vulgaree0
- Organ / stage
- seedse3
- Treatment
- wet heat shocke3
- Outcome
- magnitude of such protectione3
- Direction
- decreasese3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Barley seeds (3·6 per cent moisture content)”
e3“the magnitude of such protection decreases after a wet heat shock to the seeds”
Claim · model-written summary
Caffeine counteracted the protective action of oxygen-free hydration in irradiated barley seeds.
- Taxon
- BarleyHordeum vulgaree0
- Treatment
- caffeinee4
- Outcome
- protective action of oxygen-free hydratione4
- Direction
- counteractse4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Barley seeds (3·6 per cent moisture content)”
e4“caffeine counteracts the protective action of oxygen-free hydration”
Claim · model-written summary
Heat shock accentuated the caffeine-induced radio-sensitization in irradiated barley seeds.
- Taxon
- BarleyHordeum vulgaree0
- Treatment
- heat shocke5
- Outcome
- caffeine-induced radio-sensitizatione5
- Direction
- accentuate furthere5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Barley seeds (3·6 per cent moisture content)”
e5“the role of heat shock, in this case, is to accentuate further the caffeine-induced radio-sensitization”
Claim · model-written summary
The reactivity of caffeine towards gamma-induced intermediates may differ between oxic and anoxic conditions.
- Taxon
- BarleyHordeum vulgaree0
- Compound
- caffeinee6
- Outcome
- reactivity of caffeinee6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Barley seeds (3·6 per cent moisture content)”
e6“the reactivity of caffeine towards the gamma-induced intermediate and end-products under oxic and anoxic conditions could be very different”
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See all 7 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.