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KMID : 1041219870290020031
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Journal of Sericultural and Entomological Science
1987 Volume.29 No. 2 p.31 ~ p.37
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Studies on the Effect of Cadmium on the Physiology of Silkworm, Bombyx mori L.
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Abstract
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Mulberry leaf sprayed on at the various concentrations of cadmium (Cd) was fed on the just molted fifth instar through the 6th day of the fifth instar and content of cadmium and zinc in the feces, organs and tissues involved were analyzed by spestrophotometer. Along with the effect of those heavy metals on development of the relevant organs and tissues sexwise.
1. The residual content of cadmium on mulberry leaf was about 50% of the total cadmium and the weight of fezes disposed from the cadmium fed larvae was less than the control. There was distinctive differences in female·wise disposal of fezes between cadmium treatment and control; cadmium treatment female larvae disposed less feces than female of control.
2. Fourteen percent of the total dry wight of the anterior plus the middle silkgland and of the posterior silkgland in cadmium 100ppm treatment was decreased in female but only 9% of the anterior plus middle silkgland in male was made, showing no decrease the weight of the posterior silkgland in male.
3. Decrease of the dry weight of the silkgland, fat body and bindgut was made in cadmium 100ppm treatment and contrarily the weight of midgut and malphighian tube were increased, The total larval weight of the female and male were decreasd in cadmium 100ppm treatment and the decreasing ratio was higher in famale.
4. There was no detection of cadmium in all of the organs and tissues of the control and in those of the cadmium treatment the high residual content was in order of the midgut, hindgut, malphighian tube and head. A slight accumulation of cadmium was shown in fat body and silkgland.
5. Cadmium accumulation in the midgut was higher than in female but in the fat body, malphighian tube, head trachea and integument was contrarily high in the female than male.
6. The total zinc content of the larvae was below 60ppm in the control and 80ppm in cadmium 100ppm treatment. The increase of zinc content in cadmium treatment was made on silkgland, malphighian tube and midgut but contrarily the decrease of zinc content in fat body was resulted.
7. In cadmium treatment, much more cadmium accumulation took place in the female and zinc accumulation was made much more in the male.
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