摘要
陆地棉科遗２号×中棉完紫的种间杂交衍生后代群体中分离出一株矮秆小叶突变体，经多年选择育成了矮早棉１号。在北京气候条件下，矮早棉１号成熟时，株高只有４５ｃｍ，不到正常陆地棉的１／２。遗传分析揭示矮早棉１号的矮化早熟特性系由两对隐性基因控制，其基因符号定名为ｄ_１和ｄ_２，矮早棉１号为双隐性纯合子，基因型为ｄ_１ｄ_１ｄ_２ｄ_２。正常陆地棉ＴＭ－１、中棉所１２及中棉所１６均为显性纯合子，基因型为Ｄ_１Ｄ_１Ｄ_２Ｄ_２。控制棉花株高的两对基因Ｄ_１／ｄ_１和Ｄ_２／ｄ_２间表现重叠作用。矮早棉１号在棉花早熟育种中有重要价值。
A cotton, Gossypium hirsutum L.,mutant of dwarf earliness was discovered in the derived generation from the interspecific hybrid of G.hirsutun× G.arboreum. A variety named Dwarf earliness cotton No. 1 was breed after selection, which was only 45cm tall at the stage of maturity in Bejing, while the normal G. hirsutum was 100cm tall. Genetic analysis revealed that the expression of the dwarf plant was controlled by duplicate recessive genes. The phenotype was called dwarf mutant and designated by gene symbol d1 and d2.The genotype of Dwarf earliness cotton No.1 is d1d1d2d2 and the normal G.hirsutum is D1D1D2D2。Linkage analysis indicated no detcctable associations with the 9 genetic markers of multiple markers T586. The Dwarf earliness cotton No.1 has potential utilization value in breeding for earliness of cotton.
关键词
棉花
矮化突变体
遗传分析
Dwarf mutant, G.hirsutum,Genetic analysis, Breeding for earliness
