基于SNP标记分析玉米品种吉单50的遗传基础

Genetic Analysis on Jidan 50 Based on SNP Marker in Maize

基于SNP标记技术对玉米品种吉单50的亲本及10份骨干自交系进行分析。结果表明,吉单50母本吉A5001与599-20遗传关系最近,遗传距离0.476,划分到PB群;父本吉A5002与铁7922遗传关系最近,遗传距离0.312,划分到Reid群。吉A5002和铁7922在第10、7和5染色体上多态性最高,平均45.86%,发生交换重组频率高,基因组差异最大;第9、1、4和8染色体上多态性最低,平均14.33%,发生交换重组频率低,基因组差异较小,染色体bin 1.00等58个区段未发生重组。吉A5002和吉A5001遗传距离较远,在第3和5染色体上多态性最高,第8和9染色体上多态性最低。

Parents of Jidan 50 and 10 elite inbred lines were analyzed with SNP marker. The results showedthat female line Ji A5001 near genetic distance（0.476） with inbred line 599-20 classified into PB group. Male lineJi A5002 near genetic distance（0.312） with inbred line Tie7922 classified into Reid group. The ratio of polymor-phism markers was the highest in chromosome 10, 7 and 5 between Ji A5002 and Tie7922. But the ratio was the low-est in chromosome 9, 1, 4 and 8. There were 58 chromosome segment reorganizations including bin 1.00 did not hap-pen. Female line Ji A5001 has far genetic distance（0.70） with male line Ji A5002. The ratio of polymorphism markerswas the highest in chromosome 3 and 5. Rather the ratio was lowest in chromosome 8 and 9.