Effects of gibberellin acid, ethylene, paclobutrazol and CoCl₂ on activities of PAL and TAT in <i>S. miltiorrhiza</i> hairy roots.

<p>GA3, gibberellin acid 3; Eth, ethephon; PAL, phenylalanine ammonia-lyase, TAT, tyrosine aminotransferase. Different letters indicate significant difference at <i>p</i>≤0.05 using Tukey test test. Means ± standard deviation (S.D.) (<i>n = 3</i>) are shown.