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Research Article

JCR. 2020; 7(13): 3581-3595

Dynamics of immune enzymes in the haemolymph of different breeds of silkworm Bombyx mori L during the progress of fungal pathogen Beauveria bassiana (Bals.) Vuill.

M. Sheeba Praveena and G. Savithri.

Dynamics of immune enzymes viz., catalase and phenoloxidase was investigated in
the haemolymph of 5th instar silkworm Bombyx mori from 1st to 6th day in all three breeds
viz., crossbreed, bivoltine single hybrid and bivoltine double hybrid chosen for the study in
Beauveria bassiana inoculated silkworms. Reduction of catalase enzyme activity was
observed in haemolymph of both inoculated and control batches from 1st to 6th day of the 5th
instar silkworms. However, significant reduction of catalase enzyme activity was recorded in
Beauveria bassiana inoculated larvae in contrast to control. Gradual increase of the
phenoloxidase enzyme activity was recorded up to 4th day in bivoltine double hybrid and 3rd
day in both crossbreed and bivoltine single hybrid then the significant reduction of
phenoloxidase was noticed in the rest of the instar in Beauveria bassiana treated silkworms
compared to control. Maximum level of Catalase and Phenoloxidase activity was observed in
double hybrids followed by crossbreed and single hybrid. The research investigation very
distinctly indicated the catalase and phenoloxidase enzyme dynamics in the blood of
silkworm Bombyx mori and its association with silkworm resistance against fungal pathogen
Beauveria bassiana.

Key words: Bombyx mori, Beauveria bassiana, Haemolymph, catalase, Phenoloxidase

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