{"created":"2023-06-19T11:38:38.397938+00:00","id":6380,"links":{},"metadata":{"_buckets":{"deposit":"541f275f-0cd4-4118-ab89-1312efa4023a"},"_deposit":{"created_by":13,"id":"6380","owners":[13],"pid":{"revision_id":0,"type":"depid","value":"6380"},"status":"published"},"_oai":{"id":"oai:mie-u.repo.nii.ac.jp:00006380","sets":["420:421:498:509"]},"author_link":["14728","14729","14730"],"item_4_biblio_info_6":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"1985-12-01","bibliographicIssueDateType":"Issued"},"bibliographicPageEnd":"32","bibliographicPageStart":"25","bibliographicVolumeNumber":"71","bibliographic_titles":[{"bibliographic_title":"三重大學農學部學術報告 = The bulletin of the Faculty of Agriculture, Mie University"}]}]},"item_4_description_14":{"attribute_name":"フォーマット","attribute_value_mlt":[{"subitem_description":"application/pdf","subitem_description_type":"Other"}]},"item_4_description_4":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"Dry seeds of three rice varieties with different radiosensitivity were subjected to X‐rays of 5 to 40 kR, and the mutation frequencies and spectra were examined in the M₂ panicle‐progeny, with the aim of comparing mutagenic efficiencies of the irradiation at different stages of mitosis and meiosis. \nChlorophyll mutation frequency and, in particular, albina frequency increased exponentially with increasing dosage of X‐rays, suggesting that the chlorophyll mutations are originated from minute interstitial chromosome deletions induced by two‐hit events of the radiations. There was no varietal difference in the chlorophyll mutation frequencies among the three varieties, irrespective of their radiosensitivities measured by root‐length reduction of the irradiated seeds. Of all the mutants detected at the seedling stage and maturity, more than 50 % were sterile mutants, m ost of which seems to be due to chromosomal aberrations. The present results imply that chromosomal aberrations are predominantly induced by X-ray irradiation of dormant rice seeds and bring about high proportion of sterile and chlorophyll deficient　mutations in the M₂ generation.","subitem_description_type":"Abstract"},{"subitem_description":"体細胞分裂周期や減数分裂期の種々のステージにおける突然変異誘発効果とその突然変異スペクトラムを比較することを目的として，本研究では突然変異体誘発に最もよく用いられている乾燥種子について調査した。\n放射線感受性が顕著に異なる水稲の3品種について，乾燥粒子に5～40 kR のX線照射を行ない，M₂世代において葉緑素突然変異体，不稔変異体および形態的変異体の頻度を調べた。その結果，葉緑素突然変異体とくにアルビノ変異体の頻度は照射線量に対して指数関数的に増加した事から，これら葉緑素突然変異はX線照射による2ヒット型事象に基づく染色体の中間部欠失から由来するものと考えられる。さらに葉緑素突然変異率に関して3品種間で有意な差異が認められなかった事から，発芽時の根長で顕著に認められる放射線感受性の品種間差異をもたらす要因として染色体異常の誘発が直接的に関与していないことを示唆している。\nM₂世代において可視的に検出されたすべての突然変異体のうち55.6%が部分不稔個体や完全不稔個体を分離する不稔変異体であり，これらの大半は相互転座や逆位などの染色体異常に由来するものと考えられる。さらに突然変異スペクトラムの内訳を見ると，短稈変異体が27.1%，葉緑変異体が10.4%でその他矮性や出穂期変異体および長芒変異体などが数%認められた。\n以上の結果から，イネの乾燥種子に対する放射線照射においては染色体異常が最も誘発されやすく，照射後代において染色体異常による不稔変異体や葉緑素突然変異体が高い割合でを生ずるものと考えられる。従って種実生産を目的とする作物の突然変異育種においては染色体異常を伴なわない遺伝子突然変異体の効率的な誘発が望まれることから，種子照射よりもむしろ減数分裂期照射や受精卵細胞の分裂周期別照射などのように植物体の照射ステージを考慮することが重要であると考えられる。","subitem_description_type":"Abstract"}]},"item_4_publisher_30":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"三重大学農学部"}]},"item_4_source_id_7":{"attribute_name":"ISSN","attribute_value_mlt":[{"subitem_source_identifier":"0462-4408","subitem_source_identifier_type":"PISSN"}]},"item_4_source_id_9":{"attribute_name":"書誌レコードID","attribute_value_mlt":[{"subitem_source_identifier":"AN00234337","subitem_source_identifier_type":"NCID"}]},"item_4_text_18":{"attribute_name":"その他のタイトル","attribute_value_mlt":[{"subitem_text_language":"ja","subitem_text_value":"イネ乾燥種子のX線照射後代における農業形質に関する突然変異率とそのスペクトラム"}]},"item_4_text_63":{"attribute_name":"ノート","attribute_value_mlt":[{"subitem_text_value":"Agropedia提供データ"}]},"item_4_text_65":{"attribute_name":"資源タイプ（三重大）","attribute_value_mlt":[{"subitem_text_value":"Departmental Bulletin Paper / 紀要論文"}]},"item_4_version_type_15":{"attribute_name":"著者版フラグ","attribute_value_mlt":[{"subitem_version_resource":"http://purl.org/coar/version/c_970fb48d4fbd8a85","subitem_version_type":"VoR"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"Kowyama, Yasuo","creatorNameLang":"en"},{"creatorName":"神山, 康夫","creatorNameLang":"ja"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"Yamada, Yoshihiko","creatorNameLang":"en"},{"creatorName":"山田, 善彦","creatorNameLang":"ja"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"Kawase, Tsuneo","creatorNameLang":"en"},{"creatorName":"川瀬, 恒男","creatorNameLang":"ja"}],"nameIdentifiers":[{}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2017-02-18"}],"displaytype":"detail","filename":"AN002343370007103.pdf","filesize":[{"value":"565.6 kB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"AN002343370007103.pdf","url":"https://mie-u.repo.nii.ac.jp/record/6380/files/AN002343370007103.pdf"},"version_id":"e7d5f831-8583-4db5-990c-e9502f741823"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"eng"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"departmental bulletin paper","resourceuri":"http://purl.org/coar/resource_type/c_6501"}]},"item_title":"Mutation Rate and Spectrum with Special Reference to Agronomical Traits Induced by X-rays in Dry Seeds of Rice, Oryza sativa L.","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"Mutation Rate and Spectrum with Special Reference to Agronomical Traits Induced by X-rays in Dry Seeds of Rice, Oryza sativa L.","subitem_title_language":"en"}]},"item_type_id":"4","owner":"13","path":["509"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2007-07-11"},"publish_date":"2007-07-11","publish_status":"0","recid":"6380","relation_version_is_last":true,"title":["Mutation Rate and Spectrum with Special Reference to Agronomical Traits Induced by X-rays in Dry Seeds of Rice, Oryza sativa L."],"weko_creator_id":"13","weko_shared_id":-1},"updated":"2023-10-13T05:43:38.271002+00:00"}