核桃(Jugluns regia)是乔木树种中一个用途广泛的树种。各国的林学家、果树学家对它都非常重視,也做了不少的工作;有很多論文,都是以核桃为題而发表的。远在上世紀的末期,核桃气候馴化問題,就已列上科学研究的議程。例如米丘林所从事的核桃杂交育种工作,就正是为了这个目的。从那时起,运用米丘林所創造的远緣杂交方法,育种学家在核桃气候馴化上进行了許多工作,并取得不少的成就。我国这方面的工作也在进行。 Jugluns regia is a versatile tree species among tree species. Forestists and fruit tree scientists in various countries attach great importance to it and have done a great deal of work. A lot of papers are published on the topic of walnuts. As far back as the last century, the problem of domestication of walnut has been listed on the agenda of scientific research. For example, Michelin engaged in the work of hybrid breeding of walnuts, it is for this purpose. Since then, using the distant crosses created by Michurin, breeders have done a great deal of work on the domestication of walnuts and have made many achievements. Our country’s work in this area is also under way.