Effects of Fusarium mangiferae on active oxygen metabolism in apical bud of mango

【Objective】To study the effect of pathogens causing malformation on active oxygen metabolism in mango.【Method】We detected the changes of superoxide anion(O2·) production rate,hydrogen peroxide(H2O2),malondialdehyde(MDA),ascorbic acid(As A) and glutathiose(GSH) contents,and peroxidase(POD),catalase(CAT),superoxide dismutase(SOD),ascorbate peroxidase(APX) and glutathione reductase(GR) activities in mango infected by Fusarium mangiferae.【Result】The results showed that,the apical bud infected with F. mangiferae resulted in an increase of production rate,H2O2 and MDA contents. The content of As A had no obvious change,and the GR levels fell sharply. The activities of POD,CAT,SOD and GR increased rapidly after pathogen infection,and kept higher activities during the whole test period. The activity of APX increased at the early stage then decreased rapidly.【Conclusion】The pathogens could affect the defensive enzyme system in mango significantly,which leads to a large accumulation of reactive oxygen species,decrease in active oxygen scavenging capacity in the mango,and damages to cell finally. The antioxidant metabolism disturbances may be one of the important reasons for the disease.