数種植物種子の発芽と幼苗の発育に及ぼす高線量の放射線(^<60>Coのγ線)の影響に就いて(第二部)   :   Studies on the effect of high dose irradiation of gamma-ray (^<60>Co) upon the germination of some plant seeds and the growth of their seedlings(PART II) 

作成者 山田, 保, 橋本, 文江
作成者 (ヨミ) ヤマダ, タモツ, ハシモト, フミエ
作成者の別表記 Yamada, Tamotsu, Hashimoto, Fumie
日本十進分類法 (NDC) 460, 615
内容 In the present paper the authors dealt with the germination, growth of seedling and cripple formation resulted from the irradiation of purposely raised high exposure dose of gamma-ray (^<60>Co) to the seeds of rape, soya-bean and leaf-nodular plants. 1. In a radiation source cylinder the γ-ray of ^<60>Co was irradiated to the seeds in polyethylene bags. The experiments were practised twice : the first irradiation was carried out at a dose rate of 3, 000γ/min for 2-30 minutes and exposured corresponding to the dose range of 6, 000-90, 000γ, the second was practised with 10, 000γ/min for the same time and gave 20, 000 - 300, 000γ, respectively. 2. After the irradiation, germination and growth experiments on rape were held under room temperature (20±5℃) but in later in order to put them in an equal condition they were placed in a refrigerator (10±2℃). 3. When exposured the rape seeds to the dose range of 6, 000 - 90, 000γ, their germination was most accelerated with 30, 000γ, but with the other exposure doses it was either inferior than that or was inhibited. With 90, 000γ an exhibiting effect of germination was observed in considerable extent. The growth of seedlings which was started from the irradiated seeds indicated almost the same tendency on the germination in the initial period of growth, but in later the effects of irradiation gradually faded away and approached to the control. 4. When increased the exposure dose of radioactive ray to the dose range of 20, 000 - 300, 000γ, not only almost no promotion of germination and growth was allowed but they were inhibited proportionally to the exposure doses. Particularly there was a considerable inhibiting effect on which were irradiated with 200, 000γ and 300, 000γ. From these results we able to suggest that the minimum dose of which can affect to the germination of rape seed may be 5, 000γ or less than this, and the maximum dose for it is 500, 000γ or a little more. 5. Among them which were irradiated with the same exposure dose which was obtain
公開者 千葉大学教育学部
コンテンツの種類 紀要論文 Departmental Bulletin Paper
DCMI資源タイプ text
ファイル形式 application/pdf
ISSN 0577-6856
NCID AN00142727
掲載誌情報 千葉大学教育学部研究紀要 Vol.12 page.59-83 (19630620)
情報源 Bulletin of the Faculty of Education, Chiba University
言語 日本語
著者版フラグ publisher

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