Abstract
Pleurotus geesteranus was cultivated on the substrates blended with different ratios of treated and untreated Camellia oleifera shells using cottonseed hull as the control substrate. The mycelial growth rate, yield, nutritional composition, ash and heavy metals of the Pleurotus geesteranus cultivated on these substrates were compared. The results suggest that the Camellia oleifera shell in substrate can accelerate the mycelial growth and increase the yield, nutrients and the contents of protein, ash, crude fiber and amino acid of Pleurotus geesteranus. It was found that the contents of tannin and saponin in Camellia oleifera shell affected the mycelial growth rate. The optimal C/N of the substrate for the growth of Pleurotus geesteranus was determined to be 27 ± 0.7. The C/N ratios higher than 30 reduced the protein, fat and soluble sugar contents of the cultivated Pleurotus geesteranus. The contents of heavy metals including Hg, As, Cd and Pb were found in Pleurotus geesteranus cultivated on the substrates containing Camellia oleifera shell complex.
Highlights
Camellia oleifera is an important woody oil crop in China
The results suggest that the Camellia oleifera shell in substrate can accelerate the mycelial growth and increase the yield, nutrients and the contents of protein, ash, crude fiber and amino acid of Pleurotus geesteranus
On the substrates A1-A4, the mycelial growth rate decreased with the increase of the amount of untreated Camellia oleifera shell, the increase of tannin and saponin contents and the increase of C/N, e.g. followed the order of A1 > A2 > A3 > A4 > CK
Summary
Camellia oleifera is an important woody oil crop in China. It belongs to the genus Camellia in the family Theaceae. Camellia oleifera is widely distributed in the provinces of Hunan, Jiangxi and Guangxi in China with the cultivation area of ~55 million mu. The oil content of Camellia oleifera seed is as high as ~55%. Camellia seed oil is rich in unsaturated fatty acids, such as oleic acid and linoleic acid, and is known as the “Oriental Olive Oil” [1].
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