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Photoperiod Effect on Larval-Pupal Characters, Fat Body Nucleic Acids and Protein of Silkworm, Bombyx mori L.

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Abstract

The photoperiodic regimes [24L, 13L11D (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 photic-regimes.

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.

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Janarthanan, S., Sathiamoorthi, M., Subbu Rathinam, K.M. et al. Photoperiod Effect on Larval-Pupal Characters, Fat Body Nucleic Acids and Protein of Silkworm, Bombyx mori L.. Int J Trop Insect Sci 15, 129–137 (1994). https://doi.org/10.1017/S1742758400015356

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