{"created":"2023-05-15T09:41:22.397529+00:00","id":508,"links":{},"metadata":{"_buckets":{"deposit":"482bdf69-c8f2-4ee2-904a-4f1241367cbc"},"_deposit":{"created_by":11,"id":"508","owners":[11],"pid":{"revision_id":0,"type":"depid","value":"508"},"status":"published"},"_oai":{"id":"oai:kagawa-u.repo.nii.ac.jp:00000508","sets":["2"]},"author_link":["2677","182","1077"],"item_10001_biblio_info_7":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"1970-12-31","bibliographicIssueDateType":"Issued"},"bibliographicIssueNumber":"6","bibliographicPageEnd":"358","bibliographicPageStart":"351","bibliographicVolumeNumber":"20","bibliographic_titles":[{"bibliographic_title":"育種学雑誌","bibliographic_titleLang":"ja"},{"bibliographic_title":"Japanese journal of breeding","bibliographic_titleLang":"en"}]}]},"item_10001_description_5":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"Some theoretical equations, by the use of which the approximate size of X₂-population for quantitative character breeding can be estimated, were offered in this paper.","subitem_description_language":"en","subitem_description_type":"Abstract"},{"subitem_description":"量的形質が育種対象であるときのX₂-個体数を推定するための諸式を、3つの異なる選抜モデルについて、理論的に求めた。これらの理論式から、以下に述べるような一般的な知見が得られた。\n(1)育種形質に関与する遺伝子座間に連鎖がなければ、ある選抜強度のもとで、X₂-個体数は大まかにいって(L₁/j)(1/2m)ʲに反比例すると言える。ここに、mは遺伝子あたりの人為突然変異率を、またL₁およびjはそれぞれ、育種素材の劣悪遺伝子座の総数およびそのうちで突然変異処理によって一挙に改良すべき遺伝子座の数を示す。このことは。X₂-個体数が人為突然変異率および改良すべき遺伝子座数に強く影響されることを意味する。特に、劣悪遺伝子の突然変異率が極めて低かったり、いくつかの遺伝子座を同時に改良しようとする場合には、法外に多くのX₂-個体数が必要であろう。(2)選抜強度を高めて選抜効果をあげようとすれぼ、それだけ多くのX₂-個体が必要である。(3)突然変異個体を識別するための対象個体あるいは区の数を増すほど、X₂-個体は少なくて済む。しかしながら、両者の関係は、育種環境の均一度や育種形質の形質発現安定度など表わすて大きく変わることが考えられ、簡明な理論式でによつことは困難なようである。\n本報中の諸式を用いて数値計算を行なった結果、より具体的な知見がいくつか得られた。それらは次報で述べることにする。","subitem_description_language":"ja","subitem_description_type":"Abstract"}]},"item_10001_publisher_8":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"日本育種学会","subitem_publisher_language":"ja"}]},"item_10001_relation_12":{"attribute_name":"論文ID（NAID）","attribute_value_mlt":[{"subitem_relation_type":"isIdenticalTo","subitem_relation_type_id":{"subitem_relation_type_id_text":"120004117139","subitem_relation_type_select":"NAID"}}]},"item_10001_relation_17":{"attribute_name":"関連サイト","attribute_value_mlt":[{"subitem_relation_type":"isIdenticalTo","subitem_relation_type_id":{"subitem_relation_type_id_text":"https://doi.org/10.1270/jsbbs1951.20.351","subitem_relation_type_select":"DOI"}}]},"item_10001_rights_15":{"attribute_name":"権利","attribute_value_mlt":[{"subitem_rights":"本文データは学協会の許諾に基づきCiNiiから複製したものである","subitem_rights_language":"ja"}]},"item_10001_source_id_11":{"attribute_name":"書誌レコードID","attribute_value_mlt":[{"subitem_source_identifier":"AN00013906","subitem_source_identifier_type":"NCID"}]},"item_10001_source_id_9":{"attribute_name":"ISSN","attribute_value_mlt":[{"subitem_source_identifier":"0536-3683","subitem_source_identifier_type":"PISSN"}]},"item_10001_text_25":{"attribute_name":"KEID","attribute_value_mlt":[{"subitem_text_value":"3351"}]},"item_10001_version_type_20":{"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_access_right":{"attribute_name":"アクセス権","attribute_value_mlt":[{"subitem_access_right":"open 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