Comparison of antibacterial activities and phagocytosis in freshwater mussel Hyriopsis cumingii with different pearl-cultivation age
XU Qiao-qing1,HAO Li-ping2
1.Engineering Research Center of Wetland Agriculture in the Middle Reaches of the Yangtze River,Ministry of Education,Yangtze University, Jingzhou 434025,China;2.Hubei Information Engineering School,Jingmen 448124,China
Abstract: Plasma antibacterial activities to Staphyloccocus aureus,Micrococcus lysodeikticus,Aeromonas hydrophilia,and Escherichia coli and haemocyte phagocytosis to Staphyloccocus aureus were studied in freshwater mussel Hyriopsis cumingii with different ages.The result showed that there were higher antibacterial activities to Gram-positive bacilli(Micrococcus lysodeikticus and Staphylococcus aureus)than those to two Gram-negative bacilli(Escherichia coli and Aeromonas hydrophilia)in the 2-5 age mussels,the maximal antibacterial activity in 3-age mussel. The maximal haemocytes phagocytosis to Staphyloccocus aureus was observed in the 4-age mussels with the phagocytic rate of 36.6%and phagocytic index of 3.75 and the minimal in 2-age mussels with the phagocytic rate of 25. 2%and phagocytic index of 2.95.Those were attributed to the highest antibacterial activities and phagocytosis in 3 -4 age mussel and the highest capacity against external pathogens.However,the immune capacity was found to be declined with the increase in period of the pearl cultivation.
2011, Vol. 26 
