Authors: Chatterjee, S.¹; Taraphdar, T.²; Mohandas, T.²

Source: Genetica, Volume 125, Number 1, September 2005 , pp. 1-15(15)

Publisher: Springer

Abstract:

Exorista Sorbillans is a tachinid endoparasitoid of silkworm, Bombyx mori, and is globally known as uzi. It causes economic injury to the cocoon crop in silkworm cultivating areas of India, except those above 400 m above mean sea level (AMSL) in the foothills of the Himalayas (Darjeeling). It is reported that the sericulture tract of south India became infected with this pest only since 1980 through an accidental transportation of cocoons from West Bengal. To ascertain whether the genome of this parasitoid is differentiating into discrete gene pools in contrasting geo-climatic conditions, molecular profiling of four populations (Es _Annatapur, Es_Ramanagaram, Es _Channapatna and Es_Kodathi from south India and Es_Murshidabad from Murshidabad, West Bengal was undertaken with 13 ISSR, 3 RAPD and six non-random primers designed from various repeat sequences of B. mori . MANOVA indicated significance for the Roy’s largest root estimate (55.4; F =18.47; p = 0.002) for the variability contributed by the replication. Further, hierarchical clustering done on the basis of Euclidean distance matrix and Nei’s unbiased Phylip clustering put Es_Murshidabad at the maximum distance from those of south India and 29 markers could also be identified which significantly differentiateEs_Murshidabad from others. However, Nei’s statistics for gene diversity in sub-populations reveal considerably high gene-flow (3.44 and 2.51) among the populations around Bangalore. The gene-flow between Es_Murshidabad and other population is lowest but cannot be ignored. The comparison of endosymbiont specific 16SrRNA and fts Z gene (partial) sequences through clustalW (gcgMSF) revealed a closer relationship of Es_Murshidabad withEs_Annatapurand Es _Ramanagaram and is not congruent with the relationships discussed above. The significance of this maiden study with a tachinid fly-pest is discussed in the context of understanding the diversification of Uzi fly-pest and also establishing this pest as a relevant biological material for studying microevolution in future.

Keywords: Exorista Sorbillans; genetic divergence; silkworm endoparasitoid; Uzi-populations in India

Document Type: Research article

DOI: http://dx.doi.org/10.1007/s10709-004-6192-0

Affiliations: 1: SeriBiotech Laboratory, Central Silk Board, Kodathi Campus, Sarjapur Road, Carmelram, 560035, Bangalore, Karnataka, India, Email: shankerc99@yahoo.com; snchatterjee@yahoo.com 2: SeriBiotech Laboratory, Central Silk Board, Kodathi Campus, Sarjapur Road, Carmelram, 560035, Bangalore, Karnataka, India,

Publication date: 2005-09-01

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