Abstract: The effect of exogenous salicylic acid was studied on respiration rate，cytochrome pathway，alternative pathway，cytochrome oxidase and superoxide anion content of Ya-li pears under cold-storage. The results indicated that the treatment of salicylic acid reduced respiratory rate，the content of superoxide anion，and the proportion of?Cytochrome Pathway and alternative pathway，application of 0. 002 mmol/L SA triggered the most obvious changes.?The trend of the cytochrome pathway was positively correlated with activity of cytochrome oxidase(r =0. 95^＊＊). Respiratory intensity of cytochrome pathway was regulated by activity of cytochrome oxidase;The total respiration intensity and the content of superoxide anion were Significantly associated with respiration intensity of cytochrome?pathway、alternative pathway(r = 0. 839^＊＊，0. 675^＊＊，－ 0. 99^＊＊)，The total respiration intensity was regulated by?content of superoxide anion、respiration intensity of electron transport respiratory chain. The results showed that SA?at different concentration regulated of restrain the fruit respiration intensity by content of superoxide anion，respiration intensity of electron transport respiratory chain under cold storage，as a result extend the storage period.

Key words: Salicylic acid, Yali pears, Cytochrome pathway, Alternative pathway, Cold storage

CLC Number: 

• S661.2