Abstract
Thirteen rice varieties cultivated in Sierra Leone were used to examine varietal differences in radiosensitivity to gamma radiation during the wet season of 2006 in the lowland ecology. Dry seeds of rice varieties were exposed to gamma radiation ranging from 50 to 800 Gy to determine their responses to radiation and the effective radiation dose for mutation breeding. Percentage germination, percentage survival (field condition), seedling height and tiller production were the traits measured on the M1 generation. The results indicated that increasing doses of gamma irradiation had no effect on germination for the first seven days under laboratory conditions. Percentage survival of germinated seedlings from the 8th to 14th day under laboratory conditions decreased significantly with increase in radiation dose up to 600 Gy. With increase in radiation above 300 Gy a reduction in seedling height and percentage survival under field conditions was observed in irradiated plants of M1 generation. Increase in gamma ray doses from 50 to 300 Gy had little or no effect on tiller production as there were no significant differences in tiller number of irradiated seeds and non-irradiated (control) for all the varieties evaluated. The LD50 values determined from regression analysis based on percentage field survival ranged from 345 Gy for ROK18 to 423 Gy for ROK22. These ranges of LD50 values determined for the different rice varieties could be useful in rice varietal improvement programmes in Sierra Leone.
Abstract from the paper’s OpenAlex record; open copy licensed cc-by. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 7
Claim · model-written summary
Increasing gamma irradiation doses had no effect on rice germination in the first seven laboratory days.
- Taxon
- rice
Oryza sativat0 - Treatment
- increasing doses of gamma irradiatione0
- Outcome
- germinatione0
- Direction
- no effecte0
- Setting
- laboratory conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increasing doses of gamma irradiation had no effect on germination for the first seven days under laboratory conditions”
t0“rice varieties”
Claim · model-written summary
Seedling survival from days eight to fourteen decreased significantly with dose up to 600 Gy.
- Taxon
- riceOryza sativat0
- Treatment
- radiation dose up to 600 Gye0
- Outcome
- Percentage survival of germinated seedlingse0
- Direction
- decreasede0
- Setting
- laboratory conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Percentage survival of germinated seedlings from the 8th to 14th day under laboratory conditions decreased significantly with increase in radiation dose up to 600 Gy”
t0“rice varieties”
Claim · model-written summary
Radiation above 300 Gy reduced field seedling height.
- Taxon
- riceOryza sativat0
- Treatment
- radiation above 300 Gye0
- Outcome
- seedling heighte0
- Direction
- reductione0
- Setting
- field conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With increase in radiation above 300 Gy a reduction in seedling height and percentage survival under field conditions was observed”
t0“rice varieties”
Claim · model-written summary
Radiation above 300 Gy reduced field survival.
- Taxon
- riceOryza sativat0
- Treatment
- radiation above 300 Gye0
- Outcome
- percentage survivale0
- Direction
- reductione0
- Setting
- field conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With increase in radiation above 300 Gy a reduction in seedling height and percentage survival under field conditions was observed”
t0“rice varieties”
Claim · model-written summary
Doses from 50 to 300 Gy produced no significant difference in tiller number versus controls.
- Taxon
- riceOryza sativat0
- Treatment
- gamma ray doses from 50 to 300 Gye0
- Outcome
- tiller numbere0
- Direction
- no significant differencese0
- Comparator
- non-irradiated (control)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increase in gamma ray doses from 50 to 300 Gy had little or no effect on tiller production as there were no significant differences in tiller number of irradiated seeds and non-irradiated (control)”
t0“rice varieties”
Claim · model-written summary
ROK18 had an LD50 of 345 Gy based on field survival.
- Taxon
- riceOryza sativat0
- Material
- ROK18e0
- Outcome
- LD50 valuese0
- Value
- 345 Gye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“LD50 values determined from regression analysis based on percentage field survival ranged from 345 Gy for ROK18 to 423 Gy for ROK22”
t0“rice varieties”
Claim · model-written summary
ROK22 had an LD50 of 423 Gy based on field survival.
- Taxon
- riceOryza sativat0
- Material
- ROK22e0
- Outcome
- LD50 valuese0
- Value
- 423 Gye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“LD50 values determined from regression analysis based on percentage field survival ranged from 345 Gy for ROK18 to 423 Gy for ROK22”
t0“rice varieties”
The same questions in other papers
radiation · yield · Oryza sativa (rice)Results differ
15 papers in the same direction as this paper · 27 in the opposite direction
- positive
- positive
- negative
39 papers more in this group
See all 43 papers →radiation · growth · Oryza sativa (rice)Results differ
61 papers in the same direction as this paper · 22 in the opposite direction
- positive
- negative
- positive
80 papers more in this group
See all 84 papers →radiation · survival · Oryza sativa (rice)Positive and negative results
5 papers in the same direction as this paper · 3 in the opposite direction
- negative
- positive
- positive
5 papers more in this group
See all 9 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.