Abstract:

In order to explore the change of dormancy process and protective antioxidant enzyme system in peach tree leaves under the different photoperiod, the author took the facility-specific varieties of ‘Chunjie’ peach as experimental material, the response of leaf antioxidant enzymes system to different length photoperiod were studied during the dormancy process induced. The results showed that: the induction role of different length photoperiod was different, short day had significant effect on dormancy induction, long day played a delay role however. The activities of leaf antioxidant protective enzymes SOD, POD and CAT showed single peak curves in whole treatment period, the peaks appeared about 7 days before entering into dormancy induction period. Long day reduced the activities of 3 enzymes in various degrees, but short day made them stimulated, which indicated that the activities of SOD, POD and CAT were associated with dormancy process, and sensitive response periods were about a week before the dormancy induction period. MDA contents increased continuously with the extension of induction time. Its contents were inhibited by long day and promoted by short day, which showed long day lower level of peroxide in mesophyll cells and short day contrarily.