玉米回交后代群体中供体基因组成分分析

以郑58为受体亲本，昌7-2为供体亲本，通过杂交、回交和79对亲本间有多态的SSR标记，分析BC₂F₁和BC₃F₁世代供体的基因组成分。结果表明：BC₂F₁世代单株内的供体染色体片段数平均为11.4个，BC₃F₁世代为4.8个，从BC₂F₁到BC₃F₁单株内的供体染色体片段数减少了57.6%；BC₂F₁世代单株内的供体染色体片段长度平均为99.3 cM，BC₃F₁世代为87.1 cM，BC₃F₁较BC₂F₁减少了12.3%；BC₂F₁世代单株内的供体基因组大小平均为1 132.8 cM，BC3F1世代为421.4 cM，BC₃F₁较BC₂F₁减少了62.8%。

Analysis on Donor Genome Contents of Backcross Progenies Detected by SSR Markers on Maize

In this study, elite maize inbred lines Zheng58 and Chang7-2 were used as recipient parent and donor parent, respectively, and the characterization of donor genome contents of BC₂F₁ and BC₃F₁ backcross generations were analyzed based on 79 polymorphic SSR(Simple Sequence Repeat) markers. The results demonstrated that the average donor segment number(DSN) in each individual plant was 11.4 in BC₂F₁ and 4.8 in BC₃F₁, decreasing 57.6% with backcrossing. The average donor segment length(DSL) was 99.3 cM(Centimorgans) in BC₂F₁ and 87.1 cM in BC₃F₁, decreasing 12.3% in additional backcross generation. Meanwhile the average donor genome size(DGS) was 1132.8 cM in BC₂F₁ and 421.4 cM in BC₃F₁, decreasing 62.8% from BC₂F₁ to BC₃F₁.