The result showed that root extension, main root length, terminal branch roots and root vigor were increased under soil water stress, and the variety with drought resistance possessed high BWC/FWC and root/cap in flowering stage and maturity stage.

• 结果表明 ,土壤水分胁迫促使白芥的根幅、主根长度、末级支根数、根系活力等增加 ,抗旱品种的增加幅度较大。 开花期和成熟期抗旱性强的品种BWC/FWC值和根冠比较大。