Location of New Gene for Late Heading in Rice, Oryza sativa L. Using Interchange Homozygotes
スポンサーリンク
概要
- 論文の詳細を見る
A near isogenic line T65-LH1 was developed from an upland rice variety R300 (Thailand) through eight successive backcrossing with Thaichung 65 (T65) as a recurrent parent. Previously unpublished study indicated T65-LH1 may harbor a recessive lateness gene which was likely located on the sixth chromosome. The present study was aimed at further identifying the lateness gene of this newly bred line by linkage study and allelism test. Linkage study was conducted using seven kinds of interchange homozygotes involved with the sixth chromosome. Individual interchange homozygous lines were crossed with T65-LH1, then, each F1 population was backcrossed to T65-LH1. Segregations for heading times in all B1F1 populations showed early and late types fitted to the 1: 1 expected ratio, suggesting that T65-LH1 carried a recessive lateness gene. Chi-square values for independence between the present gene and four breakpoints, 2-6, 6-7b, 6-7c and 6-10 were insignificant. However, those to three breakpoints, 4-6, 6-7 and 6-8 were significant at 1% level and the respective recombination values were estimated as 3.2%, 4.3% and 3.4%. This suggested the gene under study was located on the sixth chromosome. Subsequently, allelism test between the present gene and other three lateness genes, ef2(t), ef3(t) and ef4(t) was carried out. Crosses of T65-LH1 and three testers having each of those lateness genes were made. Segregations for heading times in F2 populations of those crosses fitted to the 9: 3: 3: 1, 12: 3: 1 and 9: 3: 3: 1 expected ratios. It suggested the present gene was independent from the lateness genes, ef2(t), ef3(t) and ef4(t). In conclusion, the lateness gene harbored by T65-LH1 was a new gene and designated as ef5. It was carried by the sixth chromosome.
- 日本育種学会の論文
日本育種学会 | 論文
- 根粒超着生変異品種作系4号の親子鑑定
- 物性測定のための米一粒による炊飯方法の開発
- いもち病抵抗性に関する同質遺伝子系統「コシヒカリ新潟BL」のDNAマーカーによる品種判別
- 巨大胚水稲新品種「はいみのり」の育成
- イネ低アミロース系統の登熟気温による胚乳アミロース含有率変動の系統間差異