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单209是1977年由组合(IR26×农虎_6~2),经花药培养育成的粳稻品种。遗传学研究表明,该品种对稻瘟病和水稻白叶枯病的抗性受不同的单基因控制,而它们是由非轮回亲本IR26导入的。鉴于已发现的具白叶桔病抗性基因X(?)的材料均属籼稻。因此,单209可能是具该抗性基因的第1个粳稻品种。它已作为抗性亲本广泛应用于育种中。
Single 209 in 1977 by the combination (IR26 × Nonghu _6 ~ 2), developed by anther Japonica rice varieties. Genetic studies showed that the resistance of this variety to rice blast and rice bacterial blight was controlled by different single genes that were introduced by the non-recurrent parent IR26. In view of the discovery of white leaf orange resistance gene X (?) Materials are indica. Therefore, single 209 may be the first japonica rice with the resistance gene. It has been widely used in breeding as a resistant parent.