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| Mori, Masahiko; Onishi, Kazumitsu; Tokizono, Yoshiro; Shinada, Hiroshi; Yoshimura, Toru; Numao, Yoshinori; Miura, Hideho; Sato, Takashi; 大西, 一光; 三浦, 秀穂. |
| Cold stress at the booting stage in rice induces spikelet sterility because of aberrant microspore development, which often seriously damages seed production. Some breeding lines with high cold tolerance were developed by using tropical japonica variety Silewah as a donor of cold tolerance; however, the genetic factors that confer cold tolerance of this variety have not been comprehensively analyzed. In this study, phenotypic and molecular characterization of novel cold-tolerant strains derived from crosses with Silewah was performed to identify quantitative trait loci (QTLs) responsible for cold tolerance. Molecular marker analysis revealed that 2 cold-tolerant strains carried chromosomal segments of Silewah at the same genomic regions on chromosomes 3, 4... |
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Palavras-chave: Oryza sativa; Cold tolerance; Booting stage; QTL; Phenotypic selection; Marker-assisted selection; Exotic germplasm. |
| Ano: 2011 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/3040 |
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| 坂井, 祐希; 来嶋, 正朋; 足利, 奈奈; 神野, 裕信; 三浦, 秀穂; 大西, 一光. |
| コムギの子実タンパク質含有率は、小麦粉の品質や物性に大きく関わる重要な形質である。本研究では、北海道の春播きコムギ品種「はるきらり」を反復親、スペルトコムギ系統（KU-1025）を一回親として育成した戻し交雑自殖系統（Backcross Inbred Line : BILs）BC1F5 世代32 系統を用いて、子実タンパク質含有率および子実窒素吸収量について評価を行った。北見および帯広で栽培試験を行った結果、「KU-1025」の子実タンパク質含有率は、両試験区で「はるきらり」より高い値を示した。BILs における子実タンパク質含有率と子実収量の間には両試験区ともに有意 な負の相関が認められ、子実タンパク質含有率・子実収量ともに「はるきらり」を上回る系統が複数認められた。子実タンパク質含有率と同様に子実窒素吸収量についても「KU-1025」は「はるきらり」より高い値を示し、BILs の中には子実窒素吸収量および子実収量ともに「はるきらり」 を上回る系統が複数認められた。以上の結果から、「KU-1025」は、子実タンパク質含有率および子実窒素吸収量に優れており、高タンパク質含有率かつ高収量を示すパンコムギ品種の作出に貢献できる変異を有すると考えられた。 |
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Palavras-chave: スペルトコムギ; 子実タンパク質含有率 ; 子実窒素吸収量 ; 戻し交雑自殖系統; 春播きコムギ. |
| Ano: 2016 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/4382 |
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| Ureshi, An-na; Matuda, Shuichi; Ohashi, Emiko; Onishi, Kazumitsu; Takamure, Itsuro; Kato, Kiyoaki; 大西, 一光; 加藤, 清明. |
| Plants constantly sense changes in their environment. When nutrient elements are scarce, plants often allocate a greater proportion of their biomass to the root system. In the present study, we characterized the early root development of rice reduced culm number (rcn) mutants under standard growth conditions. Short lateral root length was consistent in five rcn mutants, and the remaining root traits varied between the rcn mutants. Subsequently, we characterized the effects of rcn1 mutation in response to nutrient shortage. Root development, involving the elongation of seminal, crown, and lateral roots and branching of the lateral roots, was promoted in wild type in response to nutrient shortage. However, in rcn1 mutants, crown root elongation was constant... |
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Palavras-chave: Nutrient shortage; RCN1/OsABCG5; Reduced culm number; Rice; Root architecture. |
| Ano: 2012 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/3823 |
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