RESUMO
<p><b>OBJECTIVE</b>To study the effects of PEG stress on baicalin, baicalein accumulation induced by an increased concentration of PEG solution and the related genes' expression in suspension of Scutellaria baicalensis.</p><p><b>METHOD</b>The content of baicalin, baicalein in suspension of S. baicalensis was determined by HPLC. The related genes' expression was analyzed by semi-quantitative PCR.</p><p><b>RESULT</b>The content of proline in suspension of S. baicalensis was promoted by PEG treatment. Ten percent PEG treatment promoted the expression of PAL and the content of baicalein in experimental material via a drought stress. 20% PEG solution treatment promoted the expression of UBGAT. At the same time, the increased activity of APX inhibited the progress of eliminating reactive oxygen by baicalein, which induced the transformation from baicalein to baicalin.</p><p><b>CONCLUSION</b>Active ingredient in suspension of S. baicalensis was promoted significantly via a stress of light concentration of PEG solution.</p>