Coix 属の改良に関する育種学的研究 VII : Coix 属植物の X 線感受性および照射次代の雑種 F_2 の形質分離について(農学部門) Studies on the breeding of genus Coix. VII : X-ray sensitivity of Coix varieties and segregation of characters of F_2 generation between Hatomugi (Coix Ma-yuen ROMAN.) and Juzudama (Coix Lacryma-Jobi L.) in the X_2 generation (Agriculture)

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Coix属植物の栽培種であるハトムギと野生種のジュズダマ, およびその雑種F_1さらに人為的に作出した4xハトムギと4xF_1の5植物の乾燥種子に対して5∿20krのX線を照射し, 照射当代におけるX線感受性と, さらに照射F_1の次代における形質の分離および形質間の連関性に対するX線の作用を調査した。1.照射当代の発芽率および生存率は, 照射線量の増加にともない低下するが, 概してF_1は抵抗性を示し, 異質および同質四倍体はこれにつぎ, ハトムギおよびジュズダマは供試植物中最も感受性を示した。出穂期は, 両四倍体は線量増加にともないかなり遅延し, ハトムギおよびジュズダマはやや出穂促進の傾向を示したがF_1は殆ど影響されない。草丈は一般に線量とともに低下するが, F_1は5∿15krの線量では殆ど影響されない。花粉稔性はF_1および4xF_1では15krまでは殆ど低下せず, 20krにおいてかなり低下した。他の3種は線量増加にともない減少したが, 同質四倍体は花粉稔性については感受性が大である。種子稔性は線量とともに一次函数的に低下したが, F_1および四倍体は, ハトムギ, ジュズダマに比してその傾向は著しくない。2. F_1 (X_1)個体中の極早生個体によりF_2を育成したが, 早生選抜の効果はなく, 概して晩生個体を多く分離した。草丈の頻度分布はやや連続的となり, 線量とともに細茎を叢生する矮生個体がかなり出現した。生体重は高線量区でかなり増大する傾向を示した。花粉および種子稔性はいずれも低下し, とくに高線量区には低稔性個体の出現が多い。草丈と諸形質間の相関は, 対照区に比較してかなり低く, とくに分蘗数, 生体重および稔性などと草丈との間において著しく, 概してX線照射は遺伝子の多面発現ないしは連鎖に大きく影響することが推察された。3.本実験結果より, 雑種F_1はX線に対して最も抵抗性を示し, 異質および同質四倍体はこれにつぎ, ハトムギおよびジュズダマは最も感受性を示すことが明らかになつた。またX線照射を利用して雑種後代の育成を行なう場合には, 変異個体の選抜はもとより, とくに有用形質間の連関性を把握しつつ行なうことが必要であると考える。The present paper deals with the investigation on the radiosensitivity of several Coix varieties in the X_1 generation and the genic segregation in the F_2 generation raised from irradiated F_1 seeds. The Coix varieties used in this experiments were Hatomugi (Coix Ma-yuen ROMAN.), that is cultivated type in genus Coix, and Juzudama (Coix Lacryma-Jobi L.), that is wild type, and its F_1 hybrid, and two tetraploid varieties, namely autotetraploid Hatomugi and allotetraploid between Hatomugi and Juzudama. Dry dormant seeds of these varieties were irradiated with X-rays of 5-20kr. After treatments, these irradiated seeds were sown in the seed bed together with control respectively. Germination and survival rates decreased linearly according to the dosage. But the radiosensitivity on the germinating and survival ability of F_1 hybrid were lowest in all varieties and auto-and allotetraploids came after F_1 hybrid. Heading date of Hatomugi and Juzudama were early with the increase of dosage, in spite of two tetraploid were delayed. The plant height in each maturity of treated varieties inhibited with the higher doses of X-rays. The pollen fertility of the irradiated F_1 and 4xF_1 varieties showed no decline as compared with the control except the decrease of fertility in 20kr, but in the other varieties decreased linearly with the increase of dosage. As for the pollen and seed fertility of F_1 and 4xF_1 showed higher resistance than the other varieties. The earliest plants on heading date in irradiated F_1 plants were selected to grow F_2 progenies. In the F_2 (X_2) generation, the effect of selection on early heading in F_1 (X_1) plants was not recognized and the rate of late heading plants at higher doses of X-rays was much higher than in the control F_2 generation. The frequency distribution on plant height of F_2 (X_2) progenies showed continuous deviation whereas three types were segregated in the control F_2. In the F_2 (X_2) generation, the dwarf plants with many slender tillerings and the vigorous plants on the plant weight were observed at the heigher doses. As for the pollen fertility, the frequency of partially and completely sterile plants increased with dose rates. Asimilar tendency was observed in seed fertility. The phenotypical correlation were calculated chiefly between plant height and the other characters. In this result, correlation coefficients in X-irradiated F_2 were inferior to control F_2,especially low correlation was recognized between plant height and some characters namely number of tillering, plant weight, pollen and seed fertility as compared with the correlation between same characters in control F_2 plants. From these experimental results, it was concluded that the F_1 (Hatomugi×Juzudama) plants were the most resistant to radiation and auto- or allotetraploid Coix are resistant for only 2 or 3 characters and Hatomugi and Juzudama, that is the diploid species of Coix, had high sensitivity for many characters, on the other hand, it was conjectured from segregation of characters of F_2 plants to result from X-irradiated F_1 plants that the function of X-ray dose to character manifestation have effect sensitively upon the linkage or pleiotropism of genes.

収録刊行物

  • 京都府立大學學術報告. 農學 = The scientific reports of Kyoto Prefectural University. Agriculture

    京都府立大學學術報告. 農學 = The scientific reports of Kyoto Prefectural University. Agriculture 14, 1-11, 1962-09-01

    京都府立大学学術報告委員会

各種コード

  • NII論文ID(NAID)
    110000057509
  • NII書誌ID(NCID)
    AN00062275
  • 本文言語コード
    JPN
  • 資料種別
    Departmental Bulletin Paper
  • 雑誌種別
    大学紀要
  • ISSN
    00757373
  • NDL 記事登録ID
    9027466
  • NDL 雑誌分類
    ZR7(科学技術--農林水産--農産)
  • NDL 請求記号
    Z18-123
  • データ提供元
    NDL  NII-ELS  IR 
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