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The effects of an exogenous nitric oxide donor(sodium nitroprusside,SNP),a NO scavenger 2-phenyl-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxode(PTIO)and carboxy-PTIO potassium salt(cPTIO)on the embryo germination of Sorbus pohuashanensis were studied in a