monosomic

(2) it was difficult to obtain alien disomic addition lines from alien monosomic and double monosomic additions;

(2)在建立小麦-冰草异源二体附加系的研究中，异源单体和双单体附加系并非好的基础材料；

(2)在建立小麦-冰草异源二体附加系的研究中，异源单体和双单体附加系并非好的基础材料；

(2) it was difficult to obtain alien disomic addition lines from alien monosomic and double monosomic additions;