1971
DOI: 10.1266/jjg.46.371
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SOMATIC MUTATION RATE AT LOW LEVELS OF CHRONIC GAMMA-RAY EXPOSURES IN <i>TRADESCANTIA</i> STAMEN HAIRS

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Cited by 29 publications
(14 citation statements)
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“…As reviewed earlier, the primary asset of the stamen-hair system is its capability to detect all pink mutant cells easily without being concealed by other cells (by just placing stamens in liquid paraffin dropped on a slide glass) as well as the capability of scoring a large number of samples (7500 to 18,000 stamen-hair cells can be observed in a single flower) (Ichikawa, 1992). These assets have proven to be especially suitable for determining the genetic effects of low-level ionizing radiations (Ichikawa, 1971(Ichikawa, , 1981a(Ichikawa, , 1992Sparrow et al, 1972;Ichikawa and Ishii, 1991;Ichikawa et al, 1996a) and chemicals (Schairer and Sautkulis, 1982;Schairer et al, 1983), for detecting the synergisms among several chemicals and X rays (Ichikawa, 1992;Ichikawa et al, 1993;Shima and Ichikawa, 1994, 1997Xiao and Ichikawa, 1995), as well as for studying the variation of spontaneous mutation frequency Takahashi and Ichikawa, 1976;Ichikawa, 1984Ichikawa, , 1992Ichikawa et al, 1995Ichikawa et al, , 1996aIchikawa et al, , 1996b at the order of 10 -4 pink mutant events per cell division (Ichikawa, 1992). Especially, newly developed use of young inflorescence-bearing shoots with roots of clone BNL 4430 cultivated in the NSC growth chamber (Shima and Ichikawa, 1994, 1997Ichikawa et al, 1995;Xiao and Ichikawa, 1995) can supply a much larger number of samples per space than using potted plants or cuttings, assures a high degree of reappearance, and decreases significantly the spontaneous mutation frequency (Shima and Ichikawa, 1994;Ichikawa et al, 1995).…”
Section: Discussionmentioning
confidence: 99%
“…As reviewed earlier, the primary asset of the stamen-hair system is its capability to detect all pink mutant cells easily without being concealed by other cells (by just placing stamens in liquid paraffin dropped on a slide glass) as well as the capability of scoring a large number of samples (7500 to 18,000 stamen-hair cells can be observed in a single flower) (Ichikawa, 1992). These assets have proven to be especially suitable for determining the genetic effects of low-level ionizing radiations (Ichikawa, 1971(Ichikawa, , 1981a(Ichikawa, , 1992Sparrow et al, 1972;Ichikawa and Ishii, 1991;Ichikawa et al, 1996a) and chemicals (Schairer and Sautkulis, 1982;Schairer et al, 1983), for detecting the synergisms among several chemicals and X rays (Ichikawa, 1992;Ichikawa et al, 1993;Shima and Ichikawa, 1994, 1997Xiao and Ichikawa, 1995), as well as for studying the variation of spontaneous mutation frequency Takahashi and Ichikawa, 1976;Ichikawa, 1984Ichikawa, , 1992Ichikawa et al, 1995Ichikawa et al, , 1996aIchikawa et al, , 1996b at the order of 10 -4 pink mutant events per cell division (Ichikawa, 1992). Especially, newly developed use of young inflorescence-bearing shoots with roots of clone BNL 4430 cultivated in the NSC growth chamber (Shima and Ichikawa, 1994, 1997Ichikawa et al, 1995;Xiao and Ichikawa, 1995) can supply a much larger number of samples per space than using potted plants or cuttings, assures a high degree of reappearance, and decreases significantly the spontaneous mutation frequency (Shima and Ichikawa, 1994;Ichikawa et al, 1995).…”
Section: Discussionmentioning
confidence: 99%
“…grown in the Research Institute of Agricultural Plants, Faculty of Agriculture, Kyoto University, Muko, Kyoto, (2) Z. pendula cv Quadricolor, (3) Z. purpusii Brückn., both from the Higashiyama Botanical Garden, Nagoya, (4 and 5) two different clones of S. purpurea Boom., one from the Faculdade de Filosofia, Ciências e Letras, Universidade de São Paulo, Ribeirão Preto, Brazil, and another from the Faculty of Science, Kyushu University, Fukuoka, and (6) T. ohiensis Raf. clone KU 7 having been used for detecting the genetic effects of low-level radiations at the Laboratory of Genetics, Faculty of Agriculture, Kyoto University, Kyoto, utilizing its blue/pink heterozygosity (Ichikawa, 1971) and complete sterility due to triploidy (Ichikawa et al, 1981). T. ohiensis was chosen for comparing with Zebrina and Setcreasea clones, because this species belongs to the series Virginianae of the section Tradescantia (Hunt, 1980) or to the T. virginiana group of Tradescantia (Martinez and Martinez, 1993), which has been regarded to be representative of Tradescantia.…”
Section: Methodsmentioning
confidence: 99%
“…KU 7 clone (2n=24, a heterozygote for flower color), the same material as in the previous studies (Ichikawa 1971(Ichikawa , 1972b, and the characteristics of this clone have been described in detail elsewhere (Ichikawa 1970(Ichikawa , 1971). …”
Section: Methodsmentioning
confidence: 99%
“…gamma radiation (Ichikawa 1971(Ichikawa , 1972b. If this turns out to be true, the safety standards which are presently applied to radiation facilities must be reconsidered because such standards have been established on the basis of regarding the biological and genetical effectiveness of scattering radiation to be at most equal to that of the primary direct radiation.…”
mentioning
confidence: 99%