Abstract
In thc previous paper of this series (Yamagata and Syakudo 1963b), it was reported that radiation injuries observed on the X-irradiated plants varied with the dose of X-rays and the developmental stage of plants at the irradiation. In the present study, the progeny (X2) of the irradiated plants was examined to obtain information on effective incduction of mutations. The seeds obtained from the long-day treatment section in 1961 were mainly used. The X1 panicles of each irradiated group ( I to V) were further classifred into "developmental-stage groups" based on the nunrber of days required for heading after irradiation. ( 1 ) The decrease of sprouting ability of X2 seeds obtained from X1 panicles irradiated with high doses (more than 10kr) of X-rays at postmeiotic stages was gleatel than at premeiotic stages. Almost no sprouting was observed in the seeds from X1 panicles irradiated with 20kr after meiosis. It was revealed however, that low-dose (1kr) irradiation at some stages before meiosis caused remarkabiy low sprouting abilities. ( 2 ) In the X2 generation, there were observed chlorophyll mutant seedlings such as albina, xan-tha, and viridis ; partially or complctely sterile plants ; early or late maturing plants ; tall or dwarf plants ; and plants with slender or round glumes, etc. i ) The frecluencies of the above mentioned aberrants tended to increase linearly with the dose of X-rays irrespective of irradiated stages. ii ) The frequencies of sterile X2 plants were ten times higher in the X1 panicles irradiated after meiosis than in those irradiated before meiosis. Unexpectedly, the frequencies of chlorophyll mutants and other aberrants did not vary with the developmental stages of X1 panicles at the irradiation. iii) No specific relations were found between the aberration spectrum in X2 and the developmental stage of X1 panicle at the irradiation or the kind of X1 injury. The possible cause of anomalous sprouting due to low-dose irradiation has been discussed, and the frequency and spectrum of induced aberrations examined from the viewpoint of plant breeding.
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Claims 8
Claim · model-written summary
High dose postmeiotic irradiation reduced X2 seed sprouting more than premeiotic irradiation.
- Taxon
- rice
Oryza sativat0 - Treatment
- high doses (more than 10kr) of X-rays at postmeiotic stagese0
- Outcome
- sprouting ability of X2 seedse0
- Direction
- decreasee0
- Comparator
- premeiotic stagese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice plants”
e0“decrease of sprouting ability of X2 seeds obtained from X1 panicles irradiated with high doses (more than 10kr) of X-rays at postmeiotic stages was gleatel than at premeiotic stages”
Claim · model-written summary
Almost no X2 seeds sprouted after 20kr irradiation following meiosis.
- Taxon
- riceOryza sativat0
- Treatment
- 20kr after meiosise0
- Outcome
- sproutinge0
- Direction
- Almost noe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice plants”
e0“Almost no sprouting was observed in the seeds from X1 panicles irradiated with 20kr after meiosis”
Claim · model-written summary
Low dose irradiation before meiosis produced very low sprouting ability at some stages.
- Taxon
- riceOryza sativat0
- Treatment
- low-dose (1kr) irradiatione0
- Outcome
- sprouting abilitiese0
- Direction
- remarkabiy lowe0
- Qualifier
- some stages before meiosise0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice plants”
e0“low-dose (1kr) irradiation at some stages before meiosis caused remarkabiy low sprouting abilities”
Claim · model-written summary
X2 progeny displayed chlorophyll, sterility, maturity, stature, and glume aberrations.
- Taxon
- riceOryza sativat0
- Outcome
- chlorophyll mutant seedlings such as albina, xan-tha, and viridis ; partially or complctely sterile plants ; early or late maturing plants ; tall or dwarf plants ; and plants with slender or round glumese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice plants”
e0“In the X2 generation, there were observed chlorophyll mutant seedlings such as albina, xan-tha, and viridis ; partially or complctely sterile plants ; early or late maturing plants ; tall or dwarf plants ; and plants with slender or round glumes, etc.”
Claim · model-written summary
Aberrant frequencies tended to rise linearly with X-ray dose regardless of irradiated stage.
- Taxon
- riceOryza sativat0
- Treatment
- dose of X-rayse0
- Outcome
- frecluencies of the above mentioned aberrantse0
- Direction
- increase linearlye0
- Qualifier
- irrespective of irradiated stagese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice plants”
e0“frecluencies of the above mentioned aberrants tended to increase linearly with the dose of X-rays irrespective of irradiated stages”
Claim · model-written summary
Sterile X2 plants were ten times more frequent after postmeiotic than premeiotic irradiation.
- Taxon
- riceOryza sativat0
- Treatment
- irradiated after meiosise0
- Outcome
- frequencies of sterile X2 plantse0
- Direction
- highere0
- Value
- ten timese0
- Comparator
- those irradiated before meiosise0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice plants”
e0“frequencies of sterile X2 plants were ten times higher in the X1 panicles irradiated after meiosis than in those irradiated before meiosis”
Claim · model-written summary
Chlorophyll mutant and other aberrant frequencies did not vary by irradiation stage.
- Taxon
- riceOryza sativat0
- Organ / stage
- developmental stages of X1 paniclese0
- Outcome
- frequencies of chlorophyll mutants and other aberrantse0
- Direction
- did not varye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice plants”
e0“frequencies of chlorophyll mutants and other aberrants did not vary with the developmental stages of X1 panicles at the irradiation”
Claim · model-written summary
X2 aberration spectrum had no specific relation to irradiation stage or X1 injury type.
- Taxon
- riceOryza sativat0
- Organ / stage
- developmental stage of X1 paniclee0
- Outcome
- aberration spectrum in X2e0
- Direction
- No specific relationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice plants”
e0“No specific relations were found between the aberration spectrum in X2 and the developmental stage of X1 panicle at the irradiation or the kind of X1 injury”
The same questions in other papers
radiation · quality: postharvest · Oryza sativa (rice)Positive and negative results
3 in the opposite direction
- positive
- positive
- positive
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.