Radiosensitivity in Plants : I. Relation between the water content of some crop seeds and their sensitivity to different doses of X-rays and γ-rays

Katayama, Taira; Nagamatsu, Tsutsumi

doi:10.1270/jsbbs1951.16.77

Cited by 4 publications

(1 citation statement)

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“…Sensitivity to gamma-rays and thermal neutrons after redrying of pre-soaked seeds It has been shown in barley (Caldecott 1955a, Ehrenberg 1955a, rice (Myttenaere et al 1965, Kawai and Sato 1966, Ukai 1969) and other crops (Katayama and Nagamatsu 1966) that, in the range of 2 to 25% of moisture content, seeds with an intermediate moisture content are most resistant to gamma-rays or X-rays and the radiosensitivity of seeds increased with decreasing or increasing moisture content. As shown in Table 1, D 50g for 0 μg·g −1 ( 10 B non-enriched) solution was lower in high moisture content Since the seeds of different moisture contents were placed in different layers during thermal neutron irradiation, doses of contaminating gamma-rays varied between moisture contents.…”

Section: Discussionmentioning

confidence: 99%

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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