丹参毛状根的诱导及培养条件的优化

为了建立丹参毛状根的诱导方法及液体培养体系，以发根农杆菌A4，LBA9402，15834为试验菌株分别侵染丹参无菌苗叶片，诱导丹参毛状根，PCR扩增筛选阳性株系，HPLC测定丹酚酸含量并在此基础上进一步优化毛状根的液体培养条件。结果显示：3种发根农杆菌A4，LBA9402，15834均诱导出丹参毛状根，经PCR鉴定证明其Ri质粒T-DNA均已整合到丹参基因组中，其中发根农杆菌LBA9402和A4诱导的丹参毛状根丹酚酸含量较高，质量分数分别为（3.27±0.37）%，（3.17±0.20）%；由发根农杆菌LBA9402诱导MSOH液体培养基培养的丹参毛状根丹酚酸含量较高，质量分数为（4.56±0.36）%；由发根农杆菌LBA9402诱导，pH为4.81的MSOH液体培养基培养的丹参毛状根丹酚酸含量最高可达4.85%。因此，以发根农杆菌LBA9402和A4诱导的丹参毛状根在pH为4.81的MSOH液体培养基中培养的丹酚酸含量较高。为进一步利用基因工程技术改良中药丹参的品质奠定了基础。

Optimization of induction and culture conditions for hairy roots of Salvia miltiorrhiza

To establish induction and liquid culture system for hairy roots of Danshen (Salvia miltiorrhiza), Agrobacterium rhizogenes A4, LBA9402, 15834 as test bacterium were used to infect aseptic leaves of Danshen. The hairy roots were induced and positive transgenic hairy roots were selected with PCR using rolB and rolC as the target gene. Then hairy roots of S. miltiorrhiza were harvested and salvianolic acids were extracted with 70% methanol containing 1% formic acid. The content of salvianolic acid B (SalB) and rosmarinic acid (RA) were determined by HPLC. According to the above research results, the Danshen hairy roots induced by A. rhizogenes LBA9402 were inoculated into the following group of culture media: MSOH, MS, B5, and 6,7-V liquid media. Then the same methods of extraction and determination for the content of Danshen hairy roots were adopted. Last, the hairy roots of S. miltiorrhiza induced by A. rhizogenes LBA9402 were inoculated into the MSOH liquid media with different pH values. The content of salvianolic acid were extracted with 70% methanol containing 1% formic acid and determined by HPLC. As a result, three kinds of A. rhizogenes A4, LBA9402, 15834 could induce hairy roots and Ri plasmids were integrated into the genome of S. miltiorrhiza by PCR. Danshen hairy roots induced by A. rhizogenes LBA9402 and A4 produced much more salvianolic acid, which were (3.27±0.37)% including (1.04±0.36)% of RA and(2.22±0.29)% of SalB] and (3.17±0.20)% including(0.92±0.31)% of RA and(2.25±0.26)% of SalB], respectively. Hairy roots induced by A. rhizogenes LBA9402 when they were cultured in MSOH liquid media produced much more salvianolic acid, which was (4.56±0.36)%, including (1.12±0.26)% of RA and(3.44±0.23)% of SalB. Hairy roots induced by A. rhizogenes LBA9402 produced the most salvianolic acid when they were cultured in MSOH liquid media with the pH value 4.81, which was 4.85%, including 1.16% of RA and 3.69% of SalB. So Danshen hairy roots induced by A. rhizogenes LBA9402 and A4 produced much more salvianolic acid when they were cultured in MSOH liquid media with the pH value 4.81.The research had established the foundation on genetic engineering to improve the quality of S. miltiorrhiza.