作物育种学术语。一环系的基本材料是普通品种，二环系则来源杂交种（或综合种）的自交后代，基本材料是经过控制授粉的。
二环系统 two-loop system
第二循环管系 secondary circulating system
二信使系统环磷酸腺苷 cyclic adenosine monophosphate ; CAMP
二元环糊精体系 dual cyclodextrin
二烯系四环三萜烯醇 diethenoid tetracyclic triterpene alcohol
The similarity coefficient between individual and parents was less than 0.75 selected from second cycle inbred lines, by which, individual selected from second cycle inbred lines can be seen as the new inbred line different from parental inbred lines.
二环系选出的个体与亲本之间的相似性系数都小于0.75。
参考来源 - SSR分子标记技术在玉米品种鉴定和保护中的应用·2,447,543篇论文数据，部分数据来源于NoteExpress
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