The effects of exogenous phytohormones on hairy root growth of Polygonum multiflorum and the biosynthesis of anthraquinones in its hairy root cultures were studied. The results showed that 2, 4-D, NAA, and 6-BA possessed obvious effects on the growth of hairy roots and the biosynthesis of anthraquinones. The growth of hairy roots and the biosynthesis of anthraquinones were strongly restrained by 2, 4-D. However, NAA and 6-BA at the appropriate concentration were conducive to hairy root growth and accumulation of anthraquinones. © 2006 Institute of Microbiology, Chinese Academy of Sciences and Chinese Society for Microbiology.
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