Gene analysis for the semidwarfism of two mutant strains, Hokuriku 100 and Kanto 79, induced from a rice variety Koshihikari. Studies on the utility of artificial mutations in plant breeding XVIII.
スポンサーリンク
概要
- 論文の詳細を見る
Two semidwarf mutant breeding lines, Hokuriku 100 and Kanto 79, which were induced from a Japanese rice variety Koshihikari by gamma-ray irradiation, were analyzed for their semidwarfing genes. Compared with the original variety, Hokuriku 100 and Kanto 79 have 30 and 40% reduced culm length, respectively, and the latter flowers earlier by 10 days. The F<SUB>1</SUB>, F<SUB>2</SUB> and F<SUB>3</SUB> generations of three crosses, Koshihikari×Hokuriku 100, Koshihikari×Kanto 79 and Hokuriku 100×Kanto 79, were grown for genetic analysis. In each cross combination, several F<SUB>1</SUB> plants, 223 to 334 F<SUB>2</SUB> plants and 100 F<SUB>3</SUB> lines which were raised from randomly selected F<SUB>2</SUB> plants were examined for culm length, heading date and seed fertility. It was clarified that the semidwarfism of Hokuriku 100 is controlled by one recessive semidwarfing gene (tentatively sd(t)) which was induced in Koshihikari, and this semidwarfing gene could not manifest itself until a gametic-lethal gene of Koshihikari (tentatively lt), which is inherited independent of sd(t), mutated to its non-gametic-lethal allele (tentatively lt<SUP>m</SUP>). The semidwarfism of Kanto 79 proved to be due to the pleiotropy of one recessive early-heading gene (tentatively eh<SUP>e</SUP>) which was induced in Koshihikari. This gene was nonallelic to and independent of the above two genes sd(t) and lt, and had no interaction with the gametic-lethal gene lt. These experimental results suggest that in the cross breeding to introduce the semidwarfing gene of Hokuriku 100 into some varieties or strains, a much larger number of offsprings are needed than in usual, and that the breeding aiming at early maturity as well as semidwarfism, Kanto 79 can be adopted as an excellent cross parent. The facts that the semidwarfing gene detected in Hokuriku 100, sd(t), did not influence any agronomic characters other than culm traits and did show a unique interaction with a garnetic-1ethal gene, and the evidences that sd(t) is non-allelic to d-47 as well as to sd-1 and d-49(t), indicate that sd(t) is the gene different from all the semidwarfing and dwarfing genes so far reported. So, the authors have designated this newly detected semidwarfing gene as d-60.
- 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