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通过对测交群体的Ｘａ－２１基因特异ＰＣＲ分析，辅助选择明恢６３和盐恢５５９两个种型杂交稻恢复系的转基因后代，获得了含单个拷贝的Ｘａ－２１转基因纯合株系，这些Ｘａ－２１纯合的转基因恢复系可用于配制抗白叶枯病杂交稻．
By Xa-21 gene-specific PCR analysis of the test population, transgenic progenies of two restorer lines of Minghui 63 and Yanhui 559 were selected to obtain a single copy of Xa-21 transgenic homozygous lines, These Xa-21 homozygous transgenic restorer lines can be used to formulate bacterial blight-resistant hybrid rice.