The soluble protein and free amino acid were higher in unbolting onions, the soluble sugar, C/N and POD activity were higher in bolting onions on bulbing period.

• 鳞茎形成期，未抽薹植株游离氨基酸与可溶性蛋白质含量较高，抽薹植株可溶性糖含量、C/N值及POD活性较高。