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Screening of High Biomass and High Amino Acid Content Mutant Strain from Morchella conica

Liu Shiwang1,2 Liang Zongqi3 Liu Aiying3 Guo Zejian1 Li Debao1(1. Biotechnology Institute, Zhejiang University, Hangzhou 310029, China; 2. Department of Biology, Xuzhou Normal University, Xuzhou 221009, China; 3. Institute of Entomogenous Mycology, Guizhou University, Guiyang 550025, China)  
The isolation and regeneration of protoplasts from Morchella conica Pers. CGAC-9506 were studied.Some high biomass and high amino acid content mutant strains were isolated from M.conica CGAC-9506 protoplast treated by UV irradiation. The optimum condition of isolation protoplasts was that: 0.6 mol/L KCl phosphate buffer (pH 6.8), 4% snailase, 5% lywallzyme, 4% cellulase, hypha cultured 20 h , 30 ℃ digestion 3.5 h , and the yield of the protoplasts was 2.5×104 /mg. On the PSA (potato sucrose agar)medium containing 0.3 mol/L KCl+0.3mol/L inositol , the generation rate was 0.56% .The biomass and content of amino acids of M. conica CGAC - 950637,one of the mutant strains, were increased 7.3% and 38% respectively than that of the original strain.
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