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Photoperiod effect on larval-pupal characters, fat body nucleic acids and protein of silkworm, Bombyx mori L.

Published online by Cambridge University Press:  19 September 2011

S. Janarthanan
Affiliation:
Department of Biotechnology, School of Life Sciences, Bharathidasan University, Tiruchirappalli-620 024, Tamil Nadu, India
M. Sathiamoorthi
Affiliation:
Department of Biotechnology, School of Life Sciences, Bharathidasan University, Tiruchirappalli-620 024, Tamil Nadu, India
K. M. Subbu Rathinam
Affiliation:
Department of Biotechnology, School of Life Sciences, Bharathidasan University, Tiruchirappalli-620 024, Tamil Nadu, India
M. Krishnan*
Affiliation:
Department of Biotechnology, School of Life Sciences, Bharathidasan University, Tiruchirappalli-620 024, Tamil Nadu, India
*
* For all correspondence.
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Abstract

The photoperiodic regimes [24L, 13L 11D (natural condition), 18L6D, 12L12D, 6L18D and 24D] played a vital role on nucleic acid, protein content of fat body and larval-pupal characters of silkworm, Bombyx mori. Prolonged larval duration with a significant increase in weight of the larvae, silkgland, cocoon, pupa and shell was noted in the larvae exposed to 24L period. A significant positive correlation (r = 0.97, P < 0.01) between larval weight and egg production was noted. The DNA, RNA and protein contents increased at 24L over that of 13L11D group as well as other photicregimes.

Résumé

Des régimes à base de 24L, 13L:11T (condition naturelle), 18L:6T, 12L:12T, 6L:18T et 24T de photopériode ont joué un rôle essentiel sur les acides nucléiques, la teneur en protéine du corps gras et les caractères larvaire and pupal chez le ver-à-soie, Bombyx mori. On a observé une prolongation de la vie larvaire accompagnée d'une augmentation significative du poids de la larve, de la glande à soie, du cocon, de la pupe et de la dépouille chez la larve exposée à un régime de 24L. On a relevé aussi une corrélation significative positive (r = 0,97; P < 0,01) entre poids larvaire et production d'oeufs. Sous un régime de 24L, l'ADN, l'ARN et les teneurs en protéines ont accru par rapport au groupe soumis à 13L:11T ainsi qu'à l'égard des autres photopériodes.

Type
Research Articles
Copyright
Copyright © ICIPE 1994

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