Effects of pre-harvest spraying CaCl2 on fruit storage quality and reactive oxygen species metabolism of postharvest'Fengtang'plum fruit
[Objective]The effects of pre-harvest calcium treatment on storage quality and reactive ox-ygen species(ROS)metabolism of'Fengtang'plum fruit were studied to provide reference for the appli-cation of exogenous calcium in improving the preservation of'Fengtang'plum fruit.[Method]'Fengtang'plum trees with basically the same growth vigor were selected and sprayed with 1.5％CaCl2 solution(CaCl2 treatment)at 80,90 and 100 days after anthesis,and water was used as the control(CK).The eight-mature fruits of the two treatments were harvested and stored in an incubator at(25±1)℃ and rela-tive humidity of 85％-95％.The fruit quality and ROS metabolism indexes were measured at 0,5,10,15,20 and 25 days of storage,and the correlations between fruit quality and ROS metabolism indexes were analyzed.[Result]During 0-25 days of storage,the firmness and titratable acid content of CaCl2 treat-ment and CK fruits decreased with the extension of storage time,while the decay rate,weight loss rate and peroxidase(POD)activity increased.The respiration intensity,superoxide anion(O2)production rate,contents of total soluble solids(TSS),calcium,malondialdehyde(MDA),H2O2,ascorbic acid(AsA)and reduced glutathione(GSH),and activities of superoxide dismutase(SOD),ascorbate peroxidase(APX)and catalase(CAT)generally increased first and then decreased.Compared with CK,CaCl2 treatment in-creased fruit firmness and TSS content,reduced fruit decay rate,weight loss rate,respiratory intensity and titratable acid content,inhibited the increase of O2 production rate,H2O2 and MDA contents,and main-tained higher activities of SOD,APX,POD and CAT and contents of GSH and AsA.In CK fruits,firmness had extremely significantly negative correlations with weight loss rate and POD activity,and significantly negative correlations with decay rate,MDA and calcium.The decay rate had significantly positive correla-tions with MDA content,calcium content and POD activity.TA content had significantly positive correla-tions with firmness,and significantly or extremely significantly negative correlations with weight loss rate,decay rate,MDA content,calcium content and POD activity.In CaCl2 treatment,the firmness had signifi-cantly negative correlations with weight loss rate,decay rate,calcium content and POD activity(P＜0.05).The weight loss rate had significantly or extremely significantly positive correlations with decay rate,calcium content,GSH content and POD activity.The decay rate had significantly positive correlations with calcium content,GSH content and POD activity.TA content had significantly positive correlation with firmness,and significantly or extremely significantly negative correlations with weight loss rate,decay rate,calcium content,GSH content and POD activity.[Conclusion]Spraying CaCl2 pre-harvest maintained high storage quality and antioxidant capacity of'Fengtang'plum fruits,so that fruit storage resistance was im-proved and fruit preservation period was prolonged.
'Fengtang'plumfruit storage qualityCaCl2 treatmentreactive oxygen species metabo-lismstorability
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