PHYSIOLOGYCAL STUDIES ON SILKGLAND OFSamiaricini(DONOVAN) UNDER THERMAL STRESS CONDITION
Among non-mulberry silks, only eri silk production is in increasing trend and India stands second ineri silk production. Eri silkworm, Samiariciniis domesticated and polyphagous in nature. In India most of the sericulture belt prevail in the tropical region where temperature goes 32–40 °C during the summer when compared to interior parts.Eri silkworm is poikilothermic insect, temperature will have direct effect on physiological growth and development of the silk gland.The silk gland accumulates proteins during the silkworm development and its growth is importance for the synthesis of silk proteins.The temperaturerequired foreri silkworm is 24-28 oC and above this temperature is harmful to the growth and development of silkworm. Insects have adopted different biological and physiological strategies to overcome changes in their surrounding environment but lack of tolerance in domesticated eri silkworm may affect growth and development of silk gland and eventually silk production. Therefore,the present studywas conducted under thermal stress condition(31.2 ± 1°C) to assess some important physiological parameters such as larval weight (g), silk gland weight (g),silk gland somatic index (%) and silk conversion index (%) ofdifferent ecoraces Viz. Borduar, Titabar and Mendipathar. The results show that Mendipatharecorace performed better than Borduar and Titabarecoracesin all the parameter studied.
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