Abstract:

Changes in the protein content in haemolymph and activities of protective enzymes of Pieris rapae infected by Paecilomyces fumosoroseus were assayed. The results indicated that  the protein content in haemolymph of the 3rd and 4th instar larvae of the P. rapae infected by P. fumosoroseus decreased obviously. The SOD, POD and CAT activity of the infected P. rapae was significantly lower than that of the control not infected. The effect on the 3rd instar larvae of P. rapae was more obvious than on the 4th instar. In addition, the GSTs activity of the 3rd and 4th instar larvae of P. rapae was higher in the early period of infection, but was lower in the late period of infection than that of the healthy P. rapae in the corresponding period.

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Key words: Pieris rapae, Paecilomyces fumosoroseus, pathogenesis, protein content, protective enzymes, GSTs