Abstract
By freezing seeds of barley, Hordeum vulgare, in dry ice at - 78 deg C, development of increased damage in postradiation storags was inhibited. Frozen irradiated seeds responded to subsequent storage at 23 deg C the same as newly irradiated seed. Preradiation heat treatments of dry seeds reduced observed injury but postradiation heat treatments increased injury. Germination temperature was found to be an important factor determining the level of radiation-induced injury expressed by seeds. Germination at 27 deg C was conducive to lower damage, whereas germination at 20 deg C or lower seemed to favor greater damage. The period of temperature influence on observed injury appeared to be limited, possibly to the duration of the first mitosis in the embryo. Short duration (60 sec) 60 deg C heat shocks on seeds with approximately 16% embryo moisture served not only to reduce injury, measured as seedling height, but also to reduce the frequency of induced chromosome fragments in shoot- tips from irradiated seeds. The results appear to coincide with those obtained following irradiation of biologically important macromolecules such as cellulose, plastics, and DNA. The findings tend to support the thesis that under certain conditions radiation-activated or excited states may mediate amore » larger or smaller proportion of the total cell damage induced by x radiation. (auth)« less
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Claims 9
Claim · model-written summary
Freezing irradiated barley seed at - 78 deg C inhibited damage during postradiation storage.
- Taxon
- barley
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Hordeum vulgaree0 - Treatment
- freezing seeds of barley, Hordeum vulgare, in dry ice at - 78 deg Ce0
- Outcome
- development of increased damagee0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“By freezing seeds of barley, Hordeum vulgare, in dry ice at - 78 deg C, development of increased damage in postradiation storags was inhibited”
Claim · model-written summary
Frozen irradiated seeds responded to storage at 23 deg C like newly irradiated seed.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- subsequent storage at 23 deg Ce0
- Outcome
- respondede0
- Direction
- the samee0
- Comparator
- newly irradiated seede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Frozen irradiated seeds responded to subsequent storage at 23 deg C the same as newly irradiated seed”
t0“MODIFICATION OF RADIATION INDUCED DAMAGE IN BARLEY SEEDS BY THERMAL ENERGY”
Claim · model-written summary
Preradiation heating reduced seed injury.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- Preradiation heat treatments of dry seedse0
- Outcome
- observed injurye0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Preradiation heat treatments of dry seeds reduced observed injury”
t0“MODIFICATION OF RADIATION INDUCED DAMAGE IN BARLEY SEEDS BY THERMAL ENERGY”
Claim · model-written summary
Postradiation heating increased seed injury.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- postradiation heat treatmentse0
- Outcome
- injurye0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“postradiation heat treatments increased injury”
t0“MODIFICATION OF RADIATION INDUCED DAMAGE IN BARLEY SEEDS BY THERMAL ENERGY”
Claim · model-written summary
Germination at 27 deg C was associated with lower radiation damage.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- Germination at 27 deg Ce0
- Outcome
- damagee0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Germination at 27 deg C was conducive to lower damage”
t0“MODIFICATION OF RADIATION INDUCED DAMAGE IN BARLEY SEEDS BY THERMAL ENERGY”
Claim · model-written summary
Germination at 20 deg C or lower appeared to increase radiation damage.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- germination at 20 deg C or lowere0
- Outcome
- damagee0
- Direction
- greatere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“germination at 20 deg C or lower seemed to favor greater damage”
t0“MODIFICATION OF RADIATION INDUCED DAMAGE IN BARLEY SEEDS BY THERMAL ENERGY”
Claim · model-written summary
Temperature influence on injury may be limited to the first embryo mitosis.
- Taxon
- barleyHordeum vulgaret0
- Organ / stage
- embryoe0
- Outcome
- observed injurye0
- Qualifier
- duration of the first mitosise0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The period of temperature influence on observed injury appeared to be limited, possibly to the duration of the first mitosis in the embryo”
t0“MODIFICATION OF RADIATION INDUCED DAMAGE IN BARLEY SEEDS BY THERMAL ENERGY”
Claim · model-written summary
A 60-second 60 deg C heat shock at about 16% embryo moisture reduced injury measured as seedling height.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- Short duration (60 sec) 60 deg C heat shockse0
- Outcome
- injury, measured as seedling heighte0
- Direction
- reducee0
- Qualifier
- approximately 16% embryo moisturee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Short duration (60 sec) 60 deg C heat shocks on seeds with approximately 16% embryo moisture served not only to reduce injury, measured as seedling height”
t0“MODIFICATION OF RADIATION INDUCED DAMAGE IN BARLEY SEEDS BY THERMAL ENERGY”
Claim · model-written summary
The same heat shock reduced induced chromosome fragments in irradiated seed shoot tips.
- Taxon
- barleyHordeum vulgaret0
- Organ / stage
- shoot- tipse0
- Treatment
- 60 deg C heat shockst1
- Outcome
- frequency of induced chromosome fragmentse0
- Direction
- reducee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but also to reduce the frequency of induced chromosome fragments in shoot- tips from irradiated seeds”
t0“MODIFICATION OF RADIATION INDUCED DAMAGE IN BARLEY SEEDS BY THERMAL ENERGY”
t1“Short duration (60 sec) 60 deg C heat shocks on seeds with approximately 16% embryo moisture served not only to reduce injury, measured as seedling height, but also to reduce the frequency of induced chromosome fragments in shoot- tips from irradiated seeds”
The same questions in other papers
heat · crop injury · Hordeum vulgare (barley)Positive and negative results
1 in the opposite direction
- negative
cold · pest · Hordeum vulgare (barley)Results agree
1 paper in the same direction as this paper
- positive
processing · pest · Hordeum vulgare (barley)Results agree
6 papers in the same direction as this paper
- positive
- positive
- positive
3 papers more in this group
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.