一个抗玉米矮花叶病新基因位点的发现和细胞学定位

DISCOVERY AND CHROMOSOMAL LOCATION OF A NEW RESISTANCE GENE TO Maize dwarf mosaic virus STRAIN B

在抗性遗传研究的基础上 ,根据等位性分析并通过细胞遗传学研究推断 ,黄早 4所带有的一个抗病基因位于第 6染色体长臂上 ,在 Mdm1和 T6～ 9b的易位断点之间 ,靠近着丝点 ,相距 Mdm1大约在 1.9～ 4 .5个交换单位 ,与易位断点相距 33.8个交换单位。该抗病基因不同于已正式命名的位于第 6染色体短臂上的抗病显性基因 Mdm1,为新的基因位点 ,该基因对当前流行并造成危害的玉米矮花叶病 B株系表现为隐性遗传 ,建议命名为 mdm1(t)

The allelism test and genetic analysis were used to identify a recessive resistance gene to Maize dwarf mosaic virus strain B of the maize inbred Huangzao 4. The gene is located on the long arm of chromosome 6, near the centromere. The linkage distances from Mdm1 to the resistance gene, the resistance gene to the breakpoint of the translocation, T6 9b, are 1.9- 4.5 cM and 33.8 cM respectively. We proposed to designate this gene as mdm1 (t) for Maize dwarf mosaic virus resistance.