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Expression of metabolic enzyme genes and heat-shock protein genes during embryonic development in diapause and non-diapause egg of multivoltine silkworm Bombyx mori

Ragunathan Saravanakumar
  • Biotechnology Laboratory, Central Sericultural Germplasm Resources Centre, PB No. 44, Thally Road, Hosur, 635 109, Tamil Nadu, India
  • :
/ Kangayam Ponnuvel
  • Biotechnology Laboratory, Central Sericultural Germplasm Resources Centre, PB No. 44, Thally Road, Hosur, 635 109, Tamil Nadu, India
  • :
/ Syed Qadri
  • Biotechnology Laboratory, Central Sericultural Germplasm Resources Centre, PB No. 44, Thally Road, Hosur, 635 109, Tamil Nadu, India
  • :
Published Online: 2008-09-11 | DOI: https://doi.org/10.2478/s11756-008-0124-x

Abstract

The expression of metabolic enzyme genes and heat-shock protein genes (Hsp) during early embryogenesis in diapause and non-diapause eggs of the silkworm Bombyx mori was quantified by semi-quantitative RT-PCR. The trehalase gene (Tre) was expressed in non-diapause eggs up-to nine days, while in diapause eggs was not up regulated. The glycogen phosphorylase gene (GPase) was expressed in non-diapause eggs, whereas in diapause eggs a high level was observed in early stage, but down regulated in later stage. The phosphofructokinase gene (PFK) and sorbitol dehyrogenase-2 gene (SDH-2) expression was fluctuated in non-diapause eggs, whereas in diapause eggs these were expressed only at early stage and not observed in later stage. The glucose-6-phosphate dehydrogenase gene (G6P-DH) in non-diapause eggs was highly expressed during the differentiation phase and decreased in the organogenesis phase. In contrast to this, expression in diapause eggs was of low level during differentiation phase and of high level observed in the organogenesis phase. In the tissues, PFK and SDH-2 were selectively expressed in cuticle and midgut, whereas Tre expression was high in midgut and ovary of larvae incubated at 15°C. The Hsp (20.4, 20.8, 40, 70, and 90) were expressed in both diapause and non-diapause eggs. Their expression was, however, selective in tissues with Hsp20.4 in midgut and ovary, Hsp40 in head, Hsp70 in cuticle and Hsp90 in ovary and head in high amounts at 15°C. These results suggest that the metabolic enzyme genes studied except Hsp play a major role during embryogenesis of diapause and non-diapause silkworm.

Keywords: Bombyx mori; silkworm; diapause; heat-shock protein; embryogenesis; metabolic enzyme genes

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Published Online: 2008-09-11

Published in Print: 2008-10-01


Citation Information: Biologia. Volume 63, Issue 5, Pages 737–744, ISSN (Online) 1336-9563, ISSN (Print) 0006-3088, DOI: https://doi.org/10.2478/s11756-008-0124-x, September 2008

© 2008 Slovak Academy of Sciences. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. (CC BY-NC-ND 3.0)

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