Expression of the Grifola frondosa Trehalose Synthase Gene and Improvement of Drought-Tolerance in Sugarcane (Saccharum officinarum L.) Phylogenetic Analysis and Detection on the Major Ligninolytic Enzymes System of Grifola frondosa Optimization of Extraction for Exopolysaccharides from Grifola Frondosa Experimental study on intervention effect of Grifola frondosa on nonalcoholic steatohepatitis Advances in study on active polysaccharide of Grifola frondosa Genetic Transformation of Tobacco with the Trehalose Synthase Gene from Grifola frondosa Fr. Enhances the Resistance to Drought and Salt in Tobacco