Effect of Polyamines on Fecundity (egg laying capacity) trait of Tasar Silkworm, Antheraea mylitta (Daba BV)

Abstract

Antheraea mylitta, a wild sericigenous insect is a species widely distributed in India, from West Bengal in the in the East to Karnataka in the South with its natural inhabitation in the forest areas of Bihar, Orissa, Madhya Pradesh, Maharashtra, Andhra Pradesh and Telangana. It is a polyphagous insect feeding on a number of food plants primarily on Terminalia arjuna and T. tomentosa and a host of secondary food plants. The wide range of distribution of the species has encountered diverse geographic and climatic variations of the distinct areas, leading to marked differences in not only phonotypical and physiological traits but also in the commercial and technological aspects. In this study, considering the immense effect of polyamines (Spermidine, Spermine and Putrescine), as food supplements was studied, A. mylitta. The silkworms in V^th instar larval stage were fed with plain (control) and polyamines sprayed Terminalia arjuna leaves in different concentrations. The results explored as, the spd and spm by 50 μM, 100 μM increased the fecundity (egg laying capacity) than larvae treated by other drugs and even control. Considerably, the hatching percentage calculations revealed that, the females of spd (♀) 50 μM, 100 μM mates with spm (♂) 50 μM, 100 μM males were predominant, respectively, in hatching percentage into young larvae that was conclude the progressive effect of spm 100 on spermatogenesis and the spd on oogenesis which could be explored at molecular level.

Keywords: Antheraea mylitta, Polyphagous Insect, polyamines, Spermidine, Spermine Putrescine and Fecundity.

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