Age Dependent Regulation of Phenoloxidase Activity through Single and Multiple Wounding in Silkworm,Bombyx mori(Lepidoptera: Bombycidae)
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Abstract:
In insects, the activity of phenoloxidase increases near the site of injury where it not only helps in wound healing but also prevents infection. The present study discusses the regulation of phenoloxidase by age dependent mechanical injury in the silkworm. The experiment was conducted on 4th and 5th instar silkworms with single and multiple wounding. A drastic increase in the enzyme activity was observed in 4th instar caterpillars upon a single wounding. Conversely, less enzyme activity was observed in 5th instar caterpillars upon single wounding but this increased with multiple wounding. This reveals the age dependent control over phenoloxidase activity in silkworm that may be essential in the later instars to prevent any autoimmune effect caused by the enzyme. Controlling enzyme activity may be a significant evolutionary strategy adapted by the caterpillar to regulate the energy investment during 5th instar. The results of the present study confirm the probability of the presence of a novel mechanism which regulates the activity of phenoloxidase in caterpillars at different instars.Keywords:
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In insects, the activity of phenoloxidase increases near the site of injury where it not only helps in wound healing but also prevents infection. The present study discusses the regulation of phenoloxidase by age dependent mechanical injury in the silkworm. The experiment was conducted on 4th and 5th instar silkworms with single and multiple wounding. A drastic increase in the enzyme activity was observed in 4th instar caterpillars upon a single wounding. Conversely, less enzyme activity was observed in 5th instar caterpillars upon single wounding but this increased with multiple wounding. This reveals the age dependent control over phenoloxidase activity in silkworm that may be essential in the later instars to prevent any autoimmune effect caused by the enzyme. Controlling enzyme activity may be a significant evolutionary strategy adapted by the caterpillar to regulate the energy investment during 5th instar. The results of the present study confirm the probability of the presence of a novel mechanism which regulates the activity of phenoloxidase in caterpillars at different instars.
Bombycidae
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The four improved mulberry varieties i.e. S30, S36, S41, and TR10 were introduced in mulberry garden of Department of Entomology, N. M. College of Agriculture, Navsari Agricultural University, Navsari and these varieties were evaluated for nutritional potential by feeding experiments. Larvae fed with the leaves of S30 were most superior in respect of larval weight, body measurement and economic characters. The next best cultivar for these characters was TR10. The larvae reared on S41 cultivar showed inferior results in respect of economic characters.
Bombycidae
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