Responses to Ionizing Radiation

Ichikawa, Sadao

doi:10.1007/978-3-642-68090-8_8

Cited by 20 publications

(3 citation statements)

References 84 publications

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“…It should be noted that clone KU 20 has a larger average number of cells per hair than clone BNL 4430 (Ichikawa, 1992). On the other hand, the value of 1.59 for single interstitial PMEs is considerably smaller than 1.97 (Ichikawa, 1994) and 2.02 (Sanda-Kamigawara et al, 1995) in clone KU 20, and the smaller value in clone BNL 4430 suggests more frequent occurrences of chromatid-type mutations in the subterminal cells of young stamen hairs, as described earlier (Ichikawa, 1981b(Ichikawa, , 1992(Ichikawa, , 1994Ichikawa and Wushur, 2000), and/or less frequent divisions of the subterminal cells than the terminal cells (Ichikawa and Sparrow, 1967). It could also be due to chromatid-type mutations in interstitial cells which undergo cell divisions at earlier stage of hair growth (Mericle and Hazard, 1980) and occasionally even at later stage (Ichikawa and Sparrow, 1967).…”

Section: Discussionmentioning

confidence: 52%

“…The Tradescantia stamen-hair system, selected by the International Program on Plant Bioassays as one of the most suitable testers for detecting genotoxic hazards in the environment, has been used successfully to detect the genetic effects of ionizing radiations and various chemicals at low levels, as reviewed earlier (Underbrink et al, 1973;Ichikawa, 1981bIchikawa, , 1992Schairer and Sautkulis, 1982;Schairer et al, 1983;Ma et al, 1994). The system has also been shown to be suitable for studying the variation in spontaneous somatic mutation frequency (Takahashi and Ichikawa, 1976;Schairer and Sautkulis, 1982;Schairer et al, 1983;Ichikawa 1984Ichikawa , 1992Ichikawa , 1994Imai et al, 1991;Sanda-Kamigawara et al, 1991Ichikawa et al, 1995Ichikawa et al, , 1996aIchikawa et al, , 1996bIchikawa and Wushur, 2000).…”

Section: Introductionmentioning

confidence: 99%

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Further yearly analyses of spontaneous pink mutant events in the stamen hairs of Tradescantia clone BNL 4430 cultivated in the NSC growth chamber.

Ichikawa

Wushur

2001

Genes Genet. Syst.

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In order to confirm the results obtained in the previous 1-year-term (December 12, 1998, through December 10, 1999) scorings and analyses of spontaneous pink mutant events (PMEs) in the stamen hairs of Tradescantia clone BNL 4430 cultivated in a nutrient solution circulating (NSC) growth chamber, similar scorings and analyses were continued for another 52-week period from December 11, 1999, through December 8, 2000. The environmental conditions were not changed, except for a minor modification in the method of supplying the nutrient solution used. During the scoring period, 732,128 stamen hairs with an average cell number of 24.90 cells were observed, and 2,368 PMEs were detected. The overall spontaneous somatic mutation frequency was 1.35 +/- 0.03 PMEs per 10(4) hair-cell divisions, which was significantly lower than the value of 1.56 +/- 0.03 determined in the previous 52-week period, and the frequencies were lower during April through September than in other months, the period showing lower frequencies lasting 1-month longer than in the previous year. The present results reconfirmed the occurrence of a clear seasonal variation in the spontaneous mutation frequency in the NSC growth chamber, and the lower overall frequency, probably related to the minor modification in supplying the nutrient solution, is helpful for conducting mutagenicity tests at low levels, offering a lower background level. The analyses of the sectoring patterns of all these PMEs showed that the most of the 203 cases of multiple (two to five) pink sectors observed in the same stamen hairs (scored as 253 PMEs for calculating mutation frequency) were the results of events involving somatic recombinations occurred in single cells or cell lineages, rather than those of two or more independent somatic mutations occurred in different cells, agreeing with our previous study, and the significance of somatic recombinations in causing single PMEs was also reconfirmed.

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Section: Discussionmentioning

confidence: 52%

Section: Introductionmentioning

confidence: 99%

Further yearly analyses of spontaneous pink mutant events in the stamen hairs of Tradescantia clone BNL 4430 cultivated in the NSC growth chamber.

Ichikawa

Wushur

2001

Genes Genet. Syst.

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“…Various types of ionizing radiation cause multiple damage in living organisms ranging from changes at the molecular to ecosystem level (Ichikawa, 1981). Several structural and functional alterations occur in the DNA molecule as a consequence of ionizing radiation, these are responsible for most of the damage at both cellular and systemic level.…”

Section: The Effect Of Irradiation On the Destabilization Of Plant Gementioning

confidence: 99%

Radioactive contamination in Chernobyl and (epi)genetic stability of plants – A review

Lancíková¹,

Žiarovská²

2020

j. cent. eur. agric.

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Rapid industrial and agricultural development brought, besides the indisputable advances, also risks related to the environmental pollution. Widespread soil deterioration represents a global problem. Chernobyl area contaminated by radionuclides after nuclear accident in 1986 provides the opportunity to analyze in situ the impact of radiation on plant systems. Unlike animals and humans, plants are not able to move to another place with better living conditions. Therefore, plants are an ideal object to study adaptation to the conditions of environmental stress. Long-term exposure to the ionizing radiation causes widespread changes in plant genome and epigenome. Also, these alterations may result in changed phenotype. In particular, this review discusses the effect of ionizing radiation on genetic and epigenetic stability of plant genome.

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Aquatic Plants in Extreme Environments

Mélack¹

1988

Vegetation of Inland Waters

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Responses to Ionizing Radiation

Cited by 20 publications

References 84 publications

Further yearly analyses of spontaneous pink mutant events in the stamen hairs of Tradescantia clone BNL 4430 cultivated in the NSC growth chamber.

Further yearly analyses of spontaneous pink mutant events in the stamen hairs of Tradescantia clone BNL 4430 cultivated in the NSC growth chamber.

Radioactive contamination in Chernobyl and (epi)genetic stability of plants – A review

Aquatic Plants in Extreme Environments

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