导入Rht10基因的八倍体小偃麦的农艺性状遗传分析

Genetic analysis of agronomic traits in an octoploid Trititrigia with dwarfing gene Rht10

将矮秆基因Rht10导入八倍体小偃麦中获得了染色体数为 2n =56的矮秆稳定材料攀 890 74 1 1 1,其中Rht10基因表现了极强的降秆能力 ,同时攀 890 74 1 1 1的幼苗对赤霉酸反应不敏感 ,表明Rht10基因能在八倍体小偃麦遗传背景中正常表达。用该矮秆小偃麦品系与含有小麦 簇毛麦 6VS/ 6AL易位系92R137杂交 ,对F2 群体的植株株高及其它农艺性状的遗体分析表明 ,Rht10基因在杂交后代中呈显性遗传 ,从该群体中能够获得一批半矮秆、分蘖力强、抗锈病和白粉病的株系 。

A stable dwarfing line Pan89074-1-1-1 with 2n=56 was developed from the transferring of dwarfing gene Rht 10 to octoploid Trititrigia .Line Pan89074-1-1-1 exhibited plant height of 60cm,in which the Rht10 showed strong abilities of reducing plant height.The GA3 insensitivity of Pan89074-1-1-1 revealed that the gene Rht10 was easily expressed in octoploid Trititrigia background.The relationship between plant height and other agronomic traits was analyzed in the F 2 progenies from the cross between Pan89074-1-1-1 and 92R137,a line with Triticum dasypyrum 6VS-6AL translocation chromosomes.In the F 2 population,the gene Rht10 exhibited dominant inheritances and a number of plants with semi-dwarfing,strong tiller ability and resistance to rust and powdery mildew were chosen.It is likely that the advanced lines with novel genes from Thinopyrum intermedium and Dasypyrum villosum can be developed from the progenies. -