Faculty of Agriculture, Kagoshima University , 1-21-24 Korimoto, Kagoshima, Kagoshima 890-0065 , Japan.
Institute of Gene Research, Kagoshima University , 1-21-24 Korimoto, Kagoshima, Kagoshima 890-0065 , Japan.
Breed Sci. 2014 Sep;64(3):222-30. doi: 10.1270/jsbbs.64.222. Epub 2014 Sep 1.
Two extremely late heading mutants were induced by ion beam irradiation in rice cultivar 'Taichung 65': KGM26 and KGM27. The F2 populations from the cross between the two mutants and Taichung 65 showed clear 3 early: 1 late segregation, suggesting control of late heading by a recessive gene. The genes identified in KGM26 and KGM27 were respectively designated as FLT1 and FLT2. The two genes were mapped using the crosses between the two mutants and an Indica cultivar 'Kasalath'. FLT1 was located on the distal end of the short arm of chromosome 8. FLT2 was located around the centromere of chromosome 9. FLT1 might share the same locus as EHD3 because their chromosomal location is overlapping. FLT2 is inferred to be a new gene because no gene with a comparable effect to that of this gene was mapped near the centromere of chromosome 9. In crosses with Kasalath, homozygotes of late heading mutant genes showed a large variation of days to heading, suggesting that other genes affected late heading mutant genes.
两个极端晚穗突变体是通过离子束辐照诱导的水稻品种 '台中 65'：KGM26 和 KGM27。这两个突变体与台中 65 的杂交 F2 群体表现出明显的 3 早：1 晚分离，表明晚穗的控制由隐性基因决定。在 KGM26 和 KGM27 中鉴定的基因分别被命名为 FLT1 和 FLT2。这两个基因是通过两个突变体与籼稻品种 'Kasalath' 的杂交进行定位的。FLT1 位于第 8 号染色体短臂的远端。FLT2 位于第 9 号染色体的着丝粒周围。FLT1 可能与 EHD3 共享相同的基因座，因为它们的染色体位置重叠。FLT2 被推断为一个新基因，因为在第 9 号染色体的着丝粒附近没有与该基因具有可比效应的基因被定位。与 Kasalath 的杂交中，晚穗突变体基因的纯合体表现出很大的抽穗天数变化，表明其他基因影响了晚穗突变体基因。
