Contents of soluble sugar, starch, and sucrose were determined according to the method described in a previous study [40 (link)]. Content of soluble protein was determined according to the Total Protein Quantitative Assay Kit (Jiancheng Bioengineering Institute, Nanjing, China); Peroxidase Assay Kit (Jiancheng Bioengineering Institute, Nanjing, China) was used to determine the POD activity.
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