Proceedings Volume 2010 (format .pdf) - SimpBTH

G. lucidum and L. edodes species. After inoculation into the bioreactor vessel, aslow constant flow of nutritive liquid broth was maintained inside the nutritiveculture medium by recycling it and adding from time to time a fresh new one(Carlile & Watkinson, 1996). The submerged fermentation was set up at thefollowing parameters: constant temperature, 23°C; agitation speed, 80-100 rev. min-1 ; pH level, 5.7–6.0 units; dissolved oxygen tension within the range of 30-70%.After a period of submerged fermentation lasting up to 120 h, small mushroompellets developed inside the nutritive broth (Petre et al., 2010).RESULTS AND DISCUSSIONFermentation process was carried out by inoculating the growing mediumvolume (10,000 ml) with secondary mycelium inside the culture vessel of thelaboratory-scale bioreactor (Fig. 1). The whole process of growing lasts for a singlecycle between 5-7 days in case of L. edodes and between 3 to 5 days for G.lucidum. The strains of these fungal species were characterized by morphologicaland cultural stability, manifested by its ability to maintain the phenotypic andtaxonomic identity. Observations on morphological and physiological characters ofthese two tested species of fungi were made after each culture cycle, highlightingthe following aspects:► sphere-shaped structure of fungalpellets, sometimes elongated, irregular,with various sizes (from 2 to 5 mm indiameter), reddish-brown color – G.lucidum specific culture (Fig. 2).Fig. 2 – Biomass of G. lucidum as fungalpellets► globular structures of fungal pellets,irregular with diameters of 4 up to 7 mm ormycelia congestion, which have developedspecific hyphae of L. edodes (Fig. 3).Fig. 3 – Fungal pellets of L. edodes biomass168