． 2．4根系分级 依据Pregizter等（2002）根序分级方法，对每个样品的根系分成若干根段（Root segment），按根段进行分级。
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The segment of 2cm was not good reproduction material due to low survival rate. The 3cm segment and 5cm segment were best length for vertical root and horizontal root respectively.
2cm根段成活率低,不适合作罗布麻无性繁殖材料,而3cm的垂直根根段和5cm的水平根根段是根段繁殖最适宜截取长度。
参考来源 - 松嫩平原罗布麻生物生态学与化学生态学研究·2,447,543篇论文数据，部分数据来源于NoteExpress
IBA处理根段极性下端生根、发芽效果好。
IBA treatment on the under side of root section is good for rooting and budding.
结果表明，以离体去皮根段为外植体，MS为基本培养基，诱导愈伤组织较为适宜。
Callus was efficiently induced from in vitro root segment devoid of rhizodermis on MS medium.
结果表明：根瘤菌可诱发根瘤形成部位根段的根毛增生、形变和根外层传递细胞的发育。
The results showed that the hyperplasy of root hair, root deformation and the development of the root epidermal transfer cells were induced by rhizobia.
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