Uptake and transformation of selenomethione, and analysis of nutrient compositions in Auricularia auricular

Ting Hu, Z.Y. Chen and Y.B. Guo

College of Resources and Environmental Sciences, China Agricultural University, China

hutingby25@163.com

Plate and cultivation experiments were carried out to investigate the effects of selenomethione (SeMet) (0, 0.5, 1.0、2.5, 5.0, 10.0, 20.0, 40.0 μg g–1) on the growth of mycelium and fruiting bodies, the SeMet uptake and transformation, and its effects on the nutritional components and mineral elements. A dose response can be observed in the A. auricular mycelium when exposed to SeMet, the IC20, IC50 and IC80 of SeMet to mycelium was 7.6 ± 0.6, 14.5 ± 2.5, and 27.5 ± 7.2 μg g–1. SeMet supplementation increased the concentrations of organic Se up to 15.1 μg g–1, 167.3 times higher than the control (40 μg g–1 treatment). High concentrations of SeMet (≥10 μg g–1) significantly decreased the biomasses of A. auricula. The 40 μg g–1 SeMet treatment did not affect the polysaccharide and protein, but significantly decreased the total amino acids and essential amino acids in fruiting bodies. SeMet addition (0.5–40.0 μg g–1) decreased the concentrations of Fe, Zn, Cu, and Cr in fruiting bodies of A. auricula. The results indicate that SeMet can be used as a Se source for A. auricular, but at appropriate concentrations.

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