Abstract
Cottonseed hull substrates blended with different ratios of Castanea mollissima Blume shell were prepared and used for the cultivation of Pleurotus geesteranus. The effects of the chestnut shell content on the mycelial growth rate, yield, nutritional composition and contents of heavy metals of the cultivated Pleurotus geesteranus were investigated. The results suggest that the Castanea mollissima Blume shell in substrate can increase the mycelial growth rate, yield, biological efficiency and the contents of protein, crude fiber, amino acids and essential amino acids of Pleurotus geesteranus. Further investigation suggests that the tannin and saponin in Castanea mollissima Blume shell and the C/N ratio of substrate significantly influence the mycelial growth rate. The crude fat content of Pleurotus geesteranus decreased, while the contents of heavy metals including mercury (Hg), arsenic (As), cadmium (Cd) and lead (Pb) increased with the increase of the Castanea mollissima Blume shell content in substrate. Based on these results, the content of Castanea mollissima Blume shell was optimized to be less than 30% for the cultivation of Pleurotus geesteranus.
Highlights
The results suggest that the Castanea mollissima Blume shell in substrate can increase the mycelial growth rate, yield, biological efficiency and the contents of protein, crude fiber, amino acids and essential amino acids of Pleurotus geesteranus
Further increasing the shell content to 50% decreased the crude fiber content, yet the crude fiber content was still 6.92% ± 0.59% higher than that obtained on substrate CK. These results suggest that a certain amount of Castanea mollissima Blume shell in cottonseed hull substrate can increase the crude fiber content of the cultivated Pleurotus geesteranus
The mycelial growth rate of Pleurotus geesteranus decreased with the increase of the Castanea mollissima Blume shell content in substrate
Summary
It is cultivated in 26 provinces and cities across the country with the cultivation area of ~300 thousand hectares, accounting for more than 80% of the total production of the world [1]. Castanea mollissima Blume shell is the thorny shell of the fruit accounting for 10% of the weight of the fruit. It is rich in cellulose, hemicellulose, lignin, phenols, organic acids, polysaccharides, flavonoids, phytosterols, lactones, coumarins and tannins [2] [3]. Castanea mollissima Blume shell has been mainly used for the tannin production, chemical extractions and activated carbon preparation [4] [5]. It was reported that the biology efficiency of the Pleurotusostreatus cultivated on Castanea mollissima Blume shell substrate reached up to 100% - 120% [7]
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