The traditional Chinese medicine Poria cocos and Grifola frondosa were co-fermented in submerged fermentation. The effects of different solvent extraction and addition ratios of P. cocos extract on the yield of bioactive constituents of G. frondosa were investigated. The results showed that 5 g/L alcohol extract of P. cocos or 7 g/L water extract of P. cocos significantly increased the biomass, extracellular polysaccharides, intracellular polysaccharides, total flavonoids and protein of G. frondosa. Compared with the control group, the biomass of mycelium increased by 24.28% and 29.04% respectively under the optimal addition ratios of P. cocos extract, which had a significant promotion (P<0.05); the extracellular polysaccharides, intracellular polysaccharides, extracellular flavonoids, intracellular flavonoids, extracellular proteins, and intracellular proteins of G. frondosa increased by 17.8%, 30.29%, 8.32%, 10.13%, 10.49%, and 10.24% respectively when adding 5 g/L alcohol extract, which have a significant promotion (P<0.05); intracellular polysaccharides, extracellular flavonoids, intracellular flavonoids, extracellular proteins, and intracellular proteins of G. frondosa increased by 19.8%, 3.16%, 9.29%, 10.24%, and 8.78% respectively with the addition of 7 g/L water extract of P. cocos, compared with the control group, that has a significant promotion (P<0.05). The investigation revealed that a certain concentration of P. cocos extract can significantly promote the biomass of G. frondosa mycelium, the yield of bioactive constituents, and especially the yield of G. frondosa polysaccharides.
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