Abstract
Six kinds of heat-released soluble cell-wall fragments (elicitors) were prepared respectively from Neurospora crassa, Monascus purpureus, Sporobolomyces roseus, Rhodotorula rubra, Nocardia corallina N89 and Actinoplanes tuftoflagellus A05. When Penicillium sp. PT95 was grown on corn meal (CM) solid medium containing appropriate amounts of elicitors, both its sclerotia biomass and the amount of carotenoid accumulated in sclerotia were enhanced significantly (P < 0.01). Every one of the elicitors except that fromM. purpureus could also increase significantly the β-carotene fraction of total pigment (P < 0.01). Among elicitors tested, the elicitor (150 μg/g CM) originating from R. rubra gave a maximum value of sclerotia biomass, reaching 15.90 g/100g CM; the elicitor (100 μg/g CM) from M. purpureus gave the highest total carotenoid of 14,446 μg/100 g CM and β-carotene yield of 10,112 μg/100 g CM, which were respectively 2.76 and 2.72 times higher than that of control. Experimental results also showed that the elicitor from M. purpureus could inhibit effectively the occurrence of sectoring during solid-state fermentation of strain PT95.
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