There are several known sources of thornlessness for blackberries. Some of these have been used as parents and their genetics are quite well understood; others remain relatively unknown. The source and nature of thornlessness in blackberry has been reviewed by George Darrow (1937), Jack Hull (1968), and Derek Jennings (1986). In this paper we review the literature on thornlessness, discuss the status of the thornless parents discussed in these older reviews, and we also discuss more recent literaturerelated to thornlessness, new sources of thornlessness, and the genetic basis of thornlessness.
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机译：黑莓有无刺的几种已知来源。其中一些已被用作父母，其遗传学已经很广为人知。其他人仍然相对未知。 George Darrow（1937），Jack Hull（1968）和Derek Jennings（1986）对黑莓无刺性的来源和性质进行了评论。在本文中，我们回顾了有关无刺性的文献，讨论了在这些较早的综述中讨论的无刺父母的地位，并且我们还讨论了有关无刺性，无刺性新来源和无刺性遗传基础的最新文献。
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