Effect of Methyl Jasmonate on Energy Metabolism and Membrane Lipid Metabolism During Resistance to Botryosphaeria dothidea in Kiwifruit
[Objective]Soft rot caused by Botryosphaeria dothidea is one of important diseases during kiwifruit storage,which causes serious economic losses for kiwifruit industry.Methyl jasmonate(MeJA)is a kind of biological signal molecule widely existing in plants,which had been found that it could effectively induce kiwifruit's resistance to B.dothidea in previous studies.In order to further investigate the mechanism of MeJA-mediated resistance to disease in postharvest kiwifruit,the effects of MeJA on energy metabolism and membrane lipid metabolism were analyzed in this study.[Method]Hongyang kiwifruit(Actinidia chinensis cv.Hongyang)were used as experiment material and divided into three groups as follows:inoculation group,which the fruits were inoculated with B.dothidea without MeJA treatment;MeJA+inoculation group,which the fruits were fumigated with 0.1 mmol·L-1 MeJA for 24 h then inoculated with B.dothidea;control group,the fruits without MeJA treatment or inoculation with B.dothidea.All fruits were stored in an incubator((20±1)℃,90%-95%relative humidity)for 8 d.The reactive oxygen species(ROS)accumulation was analyzed by 2,7-dichlorodihydrofluorescein acetoacetate(H2DCFDA)method,malondialdehyde(MDA)content and relative conductivity were also measured.Meanwhile,phospholipase D(PLD),lipase(LPS),lipoxygenase(LOX),succinate dehydrogenase(SDH),malate dehydrogenase(MDH),H+-ATPase,Ca2+-ATPase and cytochrome C oxidase(CCO)activities and the related genes expression were analyzed.The content of Adenosine triphosphate(ATP),Adenosine diphosphate(ADP),Adenosine monophosphate(AMP),oxaloacetic acid and fenugreek acid were determined by high performance liquid chromatography(HPLC).Then the correlation between membrane lipid metabolism and energy metabolism of kiwifruit in inoculation group and MeJA+ inoculation group was analyzed.[Result]Compared with the inoculated group,MeJA treatment could inhibit the excessive accumulation of ROS in inoculated B.dothidea fruits,slowed down the degree of membrane lipid peroxidation,and effectively decreased PLD,LPS,and LOX activities and the expression levels of AcLOXs,AcPLD and AcLPS.However,MeJA increased the activities of SDH,MDH,H+-ATPase,Ca2+-ATPase and CCO and the transcription levels of AcSDH,AcMDH,AcH+-ATPase,AcCa2+-ATPase and AcCCO,promoted the production of ATP,ADP,oxaloacetic acid and fumaric acid,delayed the decline of fruit energy charge then ensured the energy required for fruit resistance to pathogens.In addition,correlation analysis showed that kiwifruit membrane lipid metabolism was positively correlated with ROS accumulation,but negatively correlated with energy charge.[Conclusion]The above results indicated that MeJA-induced resistance to B.dothidea in kiwifruit was related to its regulation of fruit energy levels and mitigation of ROS-involved membrane lipid metabolism.
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