Rht12是位于5A染色体上的显性矮秆基因.用带有该基因的普通小麦Bezostaya 1、Mercia作矮源与八倍体小黑麦杂交、回交,经自交和染色体数镜检及田间、室内选择,将Rht12基因导入八倍体小黑麦,获得了染色体数56的矮秆八倍体小黑麦株.在八倍体小黑麦遗传背景下,基因型纯合(Rht12Rht12)时降秆能力约为41.2%,杂合(Rht12rht12)时约为31.0%.小黑麦遗传背景对该基因有修饰作用.该基因增强了八倍体小黑麦的分蘖力,延迟了熟期,对籽粒饱满度有不利影响,尚需继续回交和选择. Rht12 is a dominant dwarf gene located on chromosome 5A. Using the common wheat Bezostaya 1 with this gene, Mercia was dwarfed and crossed with octoploid rye, backcrossed, , And Rht12 gene was introduced into octoploid triticale indoor to obtain the dwarf triticale triticale with chromosome number 56. In the context of octoploid triticale, genotype homozygous (Rht12Rht12) The ability of descending straw was about 41.2% and that of hybrid (Rht12rht12) was about 31.0% .The genetic background of triticale modified the gene.This gene enhanced the tillering power of octapeptide triton and delayed the maturity, On the fullness of the grain adverse effects, still need to continue to back and choose.