Abstract
Dormant seeds of two partially asynaptic strains, K-642 and K-648, in which 2 to 8 univalents were present at the first metaphase of meiosis, and a normal cultivar Kinmaze were irradiated with gamma rays of 0 to 30kR. The survival rate at maturity of the X1 plant was reduced to a marked extent in K-642 and K-648 compared with Kinmaze. The mean seed setting in K-648 was slightly less than in Kinmaze. The incidence of chlorophyll mutations in Kinmaze increased linearly with the radiation dose. In contrast, the mutation frequency in K-648 was found to increase more rapidly than a single power of the dose of gamma rays. Supposing that the loose association of homologous chromosomes in somatic cell is correspondent with the failure of hromosome pairing at meiosis, the results obtained in this experiment provide the evidence of a common basis for repair and recombination mechanisms even in rice.
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Claims 5
Claim · model-written summary
Gamma irradiation reduced survival rate at maturity of K-642 and K-648 compared with Kinmaze.
- Taxon
- rice
Oryza sativat0 - Material
- K-642 and K-648e2
- Organ / stage
- Dormant seedse1
- Treatment
- gamma rayse1
- Outcome
- survival rate at maturity of the X1 plante2
- Direction
- reducede2
- Comparator
- Kinmazee2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“IN RICE”
e1“Dormant seeds of two partially asynaptic strains, K-642 and K-648, in which 2 to 8 univalents were present at the first metaphase of meiosis, and a normal cultivar Kinmaze were irradiated with gamma rays of 0 to 30kR”
e2“The survival rate at maturity of the X1 plant was reduced to a marked extent in K-642 and K-648 compared with Kinmaze”
Claim · model-written summary
Mean seed setting in K-648 was slightly lower than in Kinmaze.
- Taxon
- riceOryza sativat0
- Material
- K-648e3
- Outcome
- mean seed settinge3
- Direction
- slightly lesse3
- Comparator
- Kinmazee3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“IN RICE”
e3“The mean seed setting in K-648 was slightly less than in Kinmaze”
Claim · model-written summary
Incidence of chlorophyll mutations in Kinmaze increased linearly with radiation dose.
- Taxon
- riceOryza sativat0
- Material
- Kinmazee4
- Treatment
- radiation dosee4
- Outcome
- incidence of chlorophyll mutationse4
- Direction
- increasede4
- Qualifier
- linearlye4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“IN RICE”
e4“The incidence of chlorophyll mutations in Kinmaze increased linearly with the radiation dose”
Claim · model-written summary
Mutation frequency in K-648 increased more rapidly than a single power of the gamma-ray dose.
- Taxon
- riceOryza sativat0
- Material
- K-648e5
- Treatment
- dose of gamma rayse5
- Outcome
- mutation frequencye5
- Direction
- increase more rapidlye5
- Qualifier
- than a single power of the dosee5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“IN RICE”
e5“the mutation frequency in K-648 was found to increase more rapidly than a single power of the dose of gamma rays”
Claim · model-written summary
The results provide evidence of a common basis for repair and recombination mechanisms in rice.
- Taxon
- riceOryza sativat0
- Outcome
- a common basis for repair and recombination mechanismse6
- Qualifier
- loose association of homologous chromosomes in somatic celle7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“IN RICE”
e6“the results obtained in this experiment provide the evidence of a common basis for repair and recombination mechanisms even in rice”
e7“Supposing that the loose association of homologous chromosomes in somatic cell is correspondent with the failure of hromosome pairing at meiosis”
The same questions in other papers
radiation · phenology · Oryza sativa (rice)Positive and negative results
3 papers in the same direction as this paper · 3 in the opposite direction
- 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.