北柴胡毛状根诱导及其植株再生体系的建立

Induction of hairy roots and plantlet regeneration of Bupleurum chinense DC.

本研究从设计多种诱导条件出发,探索建立稳定的柴胡毛状根诱导体系。发根农杆菌A4侵染北柴胡无菌苗叶基部,共培养3天后,转入抑菌培养,10天开始出现毛状根,经4～5周培养,转为液体摇培,获得大量毛状根,诱导产生的毛状根可再生成植株。毛状根再生成植株有两种方式:一种是液体摇培的毛状根自发脱落形成幼苗的继续培养,另一种是将毛状根产生脱落的类愈伤组织置于经筛选的再生固体培养基上再生成植株。柴胡毛状根及其植株再生体系的建立,为开展柴胡次生代谢研究,尤其是利用农杆菌介导的遗传转化研究和利用奠定了基础。由毛状根诱导出再生植株在新种质产生和品种改良选育方面具有应用价值。

In this study, the induction of hairy roots of Bupleurum chinense DC. was explored and established after experiments at different conditions： A. rhizogenes A4 was used to infect the leaves bases of B. chinense tube seedlings. The explants were co-cultured on Phytagel-solidified media for 3 days and then, were turned into solid media, similar with the co-culture media except that bacteriostat was added. After 10 days, rootlets began to appear and after 4 to 5 weeks, rootlets can be converted into liquid shaking culture stage. Plants regeneration from hairy root was useful for the research of new germplasm production and the variety improvement breeding. In the present study, the regenerated plants were obtained. One approach was to continuously culture under light conditions the seedlings which parting off spontaneously from the hairy roots during liquid shaking culture. The other approach was to culture the callus-like tissues produced by hairy roots with the optimized regeneration media for the induction of regenerated plants. The results of present study provide a technique to induce hairy roots and plantlet regeneration of B. chinense and this technique is helpful for the researches on metabolism, especially on the Agrobacterium-mediated genetic transformation of B. chinense.