茉莉酸甲酯对高山红景天愈伤组织中红景天苷和多糖积累的影响

Effect of methyl jasmonate on salidroside and polysaccharide accumulation in Rhodiola sachalinensis callus

目的：探明茉莉酸甲酯（Me JA）对高山红景天愈伤组织生物量及有效物质积累的影响,旨在为其产品生产提供一种新的材料来源。方法：在3 L气球型气升式生物反应器内培养高山红景天愈伤组织20 d后添加Me JA,研究了Me JA处理时间及浓度对愈伤组织生物量、红景天苷和多糖积累及超氧化物歧化酶（SOD）和过氧化物酶（POD）活性的影响。结果：用125μmol·L^-1的Me JA处理时发现0~6 d愈伤组织生物量无明显变化,但超过6 d后显著减少,Me JA处理4 d时红景天苷和多糖的含量及生产量最高,同时SOD和POD活性达最大。Me JA浓度对愈伤组织生物量和活性物质积累影响很大,浓度超过125μmol·L^-1时愈伤组织生物量明显减少;红景天苷和多糖的最大积累量分别出现在225,275μmol·L^-1的Me JA浓度处理。对SOD和POD活性测定结果发现,在Me JA 225μmol·L^-1处理中出现峰值。对高山红景天愈伤组织中红景天苷及多糖含量与野生植株进行比较的结果,愈伤组织中红景天苷和多糖含量显著高于植株的根和茎叶,愈伤组织中红景天苷的含量分别是根、茎叶的1.1倍、2.4倍;多糖含量分别是根、茎叶的3.6,8.0倍。结论：高山红景天愈伤组织在气球型气升式生物反应内培养20 d后加入225μmol·L-1的茉莉酸甲酯后继续培养4 d有利于红景天苷及多糖的积累,且这两种活性物质的含量明显高于野生植株。因此,通过生物反应器培养愈伤组织是一种获得大量高山红景天活性物质的有效方法,可作为高山红景天产品生产的另一原材料来源。

Objective： To provide a new material for producing the Rhodiolasachalinensis products, the effect of methyl jasmonate （MeJA） on callus biomass and effective compound accumulation of Rhodiolasachalinensis was studied. Method： The callusescultured in 3 L-air lift balloon type bioreactor were treated with MeJA after 20 d of bioreactor culture and the effect of MeJA concentration and treatment days on callus biomass, salidroside or polysaccharide accumulation and superoxide dismutase （SOD） and peroxidase （POD） activities were investigated. Result： The callus biomass was not significantly different after MeJA treatment （125） for 0-6 d but obviously decreased after 6 d treatment. The maximum salidroside or polysaccharide contents and SOD or POD activities were found after 4 d treatment of MeJA. MeJA concentration significantly affected callus biomass and effective compound accumulation, biomass decreased at MeJA concentrations higher than 125μmol· L^-1. However, the effective compound contents were determined at higher MeJAconcentration, and the highest salidroside and polysaccharide accumulation was found at 225 and 275 μmol· L^-1 MeJA, respectively and the maximum SOD and POD activities was found at 225 μmol· L^-1 MeJA. The effective compound contents in callus were compared with field-grown plants. Salidroside contents in calluses were 1.1-fold and 2.4-fold more than in plant roots and stem or leave, respectively. Polysaccharide content in calluses were 3.6-fold and 8. 0-fold more than in plant roots and stem or leave, respec- tively. Conclusion： Salidorside and polysaccharide in Rhodiolasachalinensiscalluses improved by MeJA treatment, 225 μmol· L^-1 MeJA and 4 d treatment were optimal. The effective compound contents in callus were obviously higher than in field-grown plants. Therefore bioreactor culture is efficient for obtaining mass effective compounds of Rhodiolasachalinensis by culturing calluses. This method could provide an alternative material source for production of Rhodiolasachalinensis products.