Thermal Stress Induced Lipidogenic Changes in The Testis and Ovaries of The Silkworm Hybrids and Their Economic Parameters

Abstract

In the present era Silkworm Bombyx mori L, a very important economical insect and backbone of the silk industry, is fully reliant on humans for its life cycle. In India, the tropical climate prevails in most of the sericulture belt, where temperature goes beyond the ambient during summer, adversely affecting the silkworm rearing relating to qualitative and quantitative traits. In order to investigate the environmental stress, effect of Thermal Stress (TS) on silkworm, Bombyx mori organs and its quantitative traits, an experiment was conducted using different breeds, PM × CSR2 (Crossbreed) and FC1 × FC2 (Double hybrid) in male and female larvae. Further, 5th instar silkworm male and female larvae were exposed to 35±1˚C temperature and the lipidogenic consistent changes in testis and ovaries was observed compared to unexposed batches, which was noticed higher temperature on lipid content of testis and ovaries was reduced. With respect to quantitative traits, larvae exhibit the differentiation in male and female silkworm. It has been noticed that, female silkworm larvae showed comparatively increased trend rather than male individuals as well as hybrids exhibited upward trend response to the higher temperature when compared to crossbreed. This finding provide a better understanding of cellular protective mechanisms against environmental stress (high temperature) and gives knowledge about effect and significance difference between the lipidogenic and quantitative changes in male and female larvae of different breeds.