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水稻品种Fujiminori的植株用X射线辐照获得的dm型突变体DMF 1茎秆高度表现出除第二节间伸长受抑制外 ,接近正常生长。该突变体的性状受显性基因Ssil控制 (Wu等 ,1997)。DMF 1的茎秆高度 ( 65 2cm )显著短于Fujiminori ( 82 1cm )和半矮秆品种Reimei ( 70 4cm )。DMF 1和Fujiminori反交杂种F1的茎秆高度处于双亲之间。反交杂种F1的穗长和穗数等农艺性状与双亲没有显著差异。通过DMF 1和Fujiminori的反交F1、F2 估算dm型的表达率 (EDM ) ,即用植株dm型茎秆数占总茎秆数的百分数来表示。在各种不同的播期下 ,SsilSsil植株的EDM值为 10 0 %或接近 10 0 %。而Ssil+植株的EDM值即使在相同播期下也不稳定。因此假定DMF 1受不完全显性基因Ssil控制。用两个形态标识基因的连锁遗传分析表明Ssil基因位于第 1染色体上的rl4 (第 4叶卷缩 )和shrl (胚乳 1收缩 )两基因位点之间 ,其重组值分别为 10 4 %和10 1%。
Plants of rice variety Fujiminori dm-type mutant obtained by X-ray irradiation DMF 1 stalk height showed nearly normal growth except for inhibition of elongation at the second internode. The trait of this mutant is controlled by the dominant gene Ssil (Wu et al., 1997). The stem height (65 2 cm) of DMF 1 was significantly shorter than that of Fujiminori (82 1 cm) and the semi-dwarf cultivar Reimei (70 4 cm). The stem height of F1 hybrids between DMF1 and Fujiminori was between parents. Anti-cross hybrid F1 spike length and spike number agronomic traits and no significant difference between parents. The rate of expression of dm-type (EDM) was estimated by crossbreeding F1 and F2 of DMF1 and Fujiminori, expressed as the percentage of plant dm-type stems to the total number of stems. Under various sowing dates, the EDM value of SsilSsil plants was 100% or close to 100%. However, the EDM values of Ssil + plants were not stable even at the same sowing date. Therefore, it is assumed that DMF 1 is under the control of the imperfect dominant gene Ssil. Linkage genetic analysis of the two morphometric marker genes showed that the Ssil gene was located between the two loci rl4 (4th leaf curl) and shrl (endosperm 1 contractile) on chromosome 1, with recombination values of 104% and 10 1%.