Radiation genetics in wheat, VIII. The RBE of heavy particles from B10 (n, α) Li7 reaction for cytogenetic effects in Einkorn wheat

Matsumura, Seiji; Kondo, Sohei; Mabuchi, Tomoo

doi:10.1016/0033-7560(63)90005-x

Cited by 35 publications

(22 citation statements)

References 15 publications

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“…The boron enrichment by Matsumura et al (1963), Ikushima (1972b), and Nakai and Saito (1976) gave smaller values of BAE. The less effective boron enrichment in these experiments may be ascribed to different causes.…”

Section: Influence Of Moisture Content Of Seeds On Baementioning

confidence: 93%

“…The less effective boron enrichment in these experiments may be ascribed to different causes. Matsumura et al (1963) immersed the seeds of Triticum monococcum for 2 days, and Ikushima (1972b) immersed the seeds of diploid, tetraploid, and hexaploid Triticum for 24 h. They both did not redry the seeds after immersion, which might have lowered BAE. Nakai and Saito (1976) immersed rice seeds for 48 h and allowed the seeds to redry.…”

Section: Influence Of Moisture Content Of Seeds On Baementioning

confidence: 99%

“…For instance, Conger and Giles (1950) reported an RBE value of 15 for chromosome aberrations in exposure of inflorescence of Tradescantia paludosa to thermal neutrons. Matsumura et al (1963) found RBE values of 8 to 56 for chromosome aberrations and chlorophyll mutation after irradiation of presoaked seeds of Triticum monococcum with thermal neutrons. Ikushima (1972b) observed an RBE value of 18.0 for seedling height in hexaploid wheat after irradiation of presoaked seeds.…”

Section: Introductionmentioning

confidence: 96%

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Moisture content of seeds affects relative biological effectiveness of alpha particles but not protons in thermal neutron exposure

2009

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The influences of moisture content of barley (Hordeum vulgare L.) seeds which were presoaked for 13 h and re-dried before irradiation on boron addition effect (BAE) and relative biological effectiveness (RBE) of alpha particles and protons were evaluated. Seeds of normal (10.21% in embryo), low (2.55%) and high (28.0%) moisture content showed different regression of BAE values on the absorbed amount of 10 B. The regression coefficient was highest for normal moisture content, followed by low moisture content, and the lowest for high moisture content. RBE of alpha particles also significantly differed between the moisture contents. Seeds of normal, low and high moisture contents showed 46.4, 37.4 and 17.0 of RBE value, respectively. Contrarily, RBE values of protons did not significantly vary with moisture content. It was found that the ratio of RBE of alpha particles between different moisture contents could be expressed by the product of the three ratios, i.e. ratio of sensitivity to gamma-rays, ratio of BAE, and ratio of moisture content. It was concluded that adjustment of moisture of the seeds to normal content (about 10%) is important to get a high value of both BAE and RBE of alpha particles.

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Section: Influence Of Moisture Content Of Seeds On Baementioning

confidence: 93%

Section: Influence Of Moisture Content Of Seeds On Baementioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

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Moisture content of seeds affects relative biological effectiveness of alpha particles but not protons in thermal neutron exposure

2009

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“…The differences were not significant at 5% level for both e B and e N . Matsumura et al (1963) irradiated seeds of T. monococcum presoaked in 0.1, 0.5, and 1.0% of aqueous solution of borax (Na 2 B 4 O 7 ·10H 2 O) for 2 days with thermal neutrons and gamma-rays, and reported high RBE values for chromosomal aberrations and chlorophyll mutations. However, they did not analyze the boron contents of the embryo and instead calculated them on the basis of the assumption of uniform distribution throughout the seed and free entry of boron atoms.…”

Section: Estimation Of Rbe For Alpha Particles and Protonsmentioning

confidence: 99%

Simultaneous estimation of relative biological effectiveness of alpha particles and protons in thermal neutron exposure of barley (Hordeum vulgare L.) seeds

Ukai¹,

Yamashita²,

Takaki

2009

Breed. Sci.

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The relative biological effectiveness (RBE) of alpha particles and protons emitted during exposure of barley (Hordeum vulgare L.) seeds to thermal neutrons were estimated. 10 B-enriched re-dried seeds were irradiated with thermal neutrons or gamma-rays. Two assumptions so far believed that boron distribution was uniform throughout either natural dormant seeds or 10 B-enriched seeds, and that boron atoms enter the seeds as freely as water molecules do, were found to be invalid. A boron addition effect (BAE) as high as 58.2 was obtained after thermal neutron exposure of seeds presoaked in 4800 μg·g −1 of 10 B-enriched boric acid solution. Estimates of RBE of alpha particles were nearly constant and independent of the contents of absorbed 10 B. RBE averaged 55.0 and 55.1 for the seed and spike presoaking methods of boron absorption, respectively. We could also obtain RBE of protons as high as 48.7 and 43.9 for the seed and spike methods, respectively. Boron addition converted the principal capture element during thermal neutron exposure from protons in dormant seeds to boron in 10 B enriched-seeds.

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“…Very little information is available on RBE for mutation rate in plants, but values are much higher than these. Matsumura et al (1963) showed in diploid wheat (Triticum monococcum) that RBE for chlorophyll mutation rate ranged from 27 to 56, depending on the borate concentration used. They excluded the RBE of 56 obtained for 0.1% borax as an extreme case and provisionally claimed that RBE was 29 ± 10.…”

Section: Rbe Of Alpha Particles and Protonsmentioning

confidence: 99%

Relative biological effectiveness of alpha particles and protons varies with biological criteria, and values are mutually correlated in thermal neutron exposure

Ukai

Yamashita

2010

Breed. Sci.

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We recently presented a method for simultaneous estimation of relative biological effectiveness (RBE) of alpha particles and protons. Here, we evaluate RBE for chlorophyll mutation rate and four M 1 effects in thermal neutron exposure of barley (Hordeum vulgare L.) seeds. RBEs of both alpha particles and protons were low for germination rate, seedling height, and number of spikes, and high for seed fertility and mutation rate. Thus, M 1 effects are not necessarily accurate as a proxy for mutation rate in comparisons of different types of radiation. RBE of alpha particles for mutation rate was 130.3, much higher than values so far reported in plant materials. RBE of protons for mutation rate was 106.4; as far as we are aware, this is the first value reported for thermal neutron exposure of plant materials. RBEs of alpha particles and protons were significantly correlated (r = 0.939, P < 0.05).

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Radiation genetics in wheat, VIII. The RBE of heavy particles from B10 (n, α) Li7 reaction for cytogenetic effects in Einkorn wheat

Cited by 35 publications

References 15 publications

Moisture content of seeds affects relative biological effectiveness of alpha particles but not protons in thermal neutron exposure

Moisture content of seeds affects relative biological effectiveness of alpha particles but not protons in thermal neutron exposure

Simultaneous estimation of relative biological effectiveness of alpha particles and protons in thermal neutron exposure of barley (Hordeum vulgare L.) seeds

Relative biological effectiveness of alpha particles and protons varies with biological criteria, and values are mutually correlated in thermal neutron exposure

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