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Research Article Open Access
The depletion of stratospheric ozone layer and the resulting increase in UV- B radiation reaching the earth is of worldwide concern. Silk producing insects are terrestrial in habits and more prone to UV- B radiation exposure. The growth and development of silk gland depends on the health of the silk worm and the silk industries in turn depend on silk production by healthy silk worms. Hence, an attempt was made to study the effect of UV- B irradiation of different time duration; 30, 60, and 120 minutes on silk gland, its development, and tissue biochemical content of 5th instar eri silkworm Philosamia ricini. Further, the SGTSI which indicates the percentage of silk gland in a silk worm larva was also calculated. The study revealed that the SGTSI of UV-B irradiated silk worms decreased significantly from day 1 to day 5 of 5th insar (at p< 0.05) as compared to control. The total protein and carbohydrate content (g%) of silk gland were also significantly decreased (at p < 0.001) as compared to control. This indicates that UV-B light alters the growth and metabolism of eri silk worm which is undesirable from economic point of view.
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Author(s): Chumkijini Chhatria*, T.V. Rao and Sunanda Sahoo
UV-B, Philosamia ricini, Silk Gland, SGTSI, Biochemical content, Plant sciences and Environmental sciences