Advertisement

Photoperiodic Implications on the Pupal Ecdysis in the Silkworm, Bombyx Mori L. (Pm x Nb4D2)

  • N. Sivarami Reddy
  • T. Pavan Kumar
  • P. Murali Mohan
  • K. Sasira Babu
Research Article

Abstract

Pupation patterns, viz. larval ripening, pharate pupal and pupal formation were diurnally predominant in the silkworm, Bombyx mori L. (PM x NB4D2), under different photoperiodic conditions. Under continuous light (LL), the rhythm damped-out. Upon circular statistical treatment of the data, the peaks expressed two distinct modes short day and long day resultant groups and these phenomena are distinct for pharate pupal formation. Duration between larval ripening and pharate pupal formation, as also between pharate pupal and pupal formation was influenced by different light/dark conditions. Duration between larval ripening and pupal formation was significantly (P < 0.05) less under LD 11:13 as compared to LD 12:12.

Key Words

Photoperiod pupal ecdysis Bombyx mori 

Résumé

On a trouvé que, sous les conditions photopériodique variables, les modèles de pupation—c’est -à-dire, la maturation larvale, la formation pharate-pupale aussi que la formation pupale—étaient prédominant pendant le jour, en cas du vers à soie, Bombyx mori. Sous l’illumination continue, le rythme s’est aplati. Quand les données expérimentales ont été soumis à une traitement statistique circulaire, les pics se sont manifestés comme deux modes distincts, c’est-à-dire, les groupes résultantes du jour court et du jour long respectivement; ce phénomène est distinct pour la formation pharate-pupale. La duration temporale entre la maturation larvale et la formation pharate-pupale, et aussi celle entre la formation pharate-pupale et la formation pupale étaient affectées par les proportions variables des périodes lumineuses et sombres. La période entre la maturation larvale et la formation pupale étaient significativement (P < 0.05) plus court pour une proportion liumineux/sombre égal à 11:13 que pour la dite proportion égal à 12:12.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Beck S. D. (1980) Insect Photoperiodism. Academic Press, New York.Google Scholar
  2. Chasse J. and Theron A. (1988) An example of circular statistics in chronobiological studies: analysis of polymorphism in the emergence rhythm of Schistosoma mansoni cercariae. Chronobiol. Inter. 5, 433–439.CrossRefGoogle Scholar
  3. Chandrashekaran M. K. and Loher W. (1969) The effect of light intensity on the circadian rhythm of eclosion m Drosophila pseudoobscur a. Z. ver gl. Physiol. 62, 337–347.CrossRefGoogle Scholar
  4. de Wilde J., Hsiao T. H. and Hsiao C. (1980) The regulation of the metamorphic moults in the Colorado potato beetle Leptinotarsa decemlineata Say. In Progress in Ecdysone Research (Edited by Hoffmann J. A.), pp. 83–98. Elsevier/North-Holland Biomedical Press, Amsterdam.Google Scholar
  5. Fukuda S. (1971) Hormonal control of moulting and pupation in the silkworm. In Milestones in Developmental Physiology of Insects (Edited by Bodenstein D.), pp. 222–225. Meredith Corporation, New York.Google Scholar
  6. Happ G. M. (1984) Development and reproduction. InlnsectBiology (Edited by Evans H. E.), pp. 93–113. Addisen-Wesley Publishing Company Inc., London.Google Scholar
  7. Hinton H. E. (1973) Neglected phase in metamorphosis: A reply to V. B. Wigglesworth. J. Entomol. (A) 48, 57–68.Google Scholar
  8. Krishnaswami S. (1986) New technology of silkworm rearing. Bulletin No. 2. Central Silk Board, Bangalore.Google Scholar
  9. Krishnaswami S., Narasimhanna M. N., Suryanaraya S. K. and Kumararaja S. (1973) Manual on Sericulture—Silkworm Rearing Vol. 2. Food and Agriculture Organization of the United Nations, Rome.Google Scholar
  10. Kogure M. (1933) The influence of light and temperature on certain characters of the silkworm, Bombyx mori. J. Dep. Agric. Kyushu Imp. Univ. 4, 1–93.Google Scholar
  11. Lounibos L. P. (1976) Initiation and maintenance of cocoon spinning behaviour by saturniid silkworms. Physiol. Entomol. 1, 195–206.CrossRefGoogle Scholar
  12. Piepho H., Boden E. and Holz I. (1960) Uber die Hormonabhangi-gkeit des Verhaltens von Schwarmraupen von den Hautungen. Z. Tierpsychol. 17, 261–269.CrossRefGoogle Scholar
  13. Pittendrigh C. S. and Bruce B.G. (1957) An oscillator model for biological clocks. In Rhythmic and Synthetic Processes in Growth (Edited by Rudnick D.), pp. 75–109. Princeton.Google Scholar
  14. Riddiford L. M. (1980) Interaction of ecdysteroids and juvenile hormone in the regulation of larval growth and metamorphosis of the tobacco homworm. In Progress in Ecdysone Research (Edited by Hofrrnann J.A.), pp.409–430. Elsevier/North-Holland Biomedical Press, Amsterdam.Google Scholar
  15. Reynolds S. E. (1980) Integration of behaviour and physiology in ecdysis. Adv. Insect Physiol. 15, 475–595.CrossRefGoogle Scholar
  16. Saunders D. S. (1982) Insect Clocks (II edn.). Pergamon Press, Oxford, New York, Toronto, Sydney, Paris, Frankfurt.Google Scholar
  17. Sivarami Reddy N., Sasira Babu K. and Pavan Kumar T. (1984) Oscillatory frequencies in Bombyx mori, LR (PM) x NB4D2. Seriologia 24, 525–545.Google Scholar
  18. Sivarami Reddy N. and Sasira Babu K. (1990) Hatching patterns in the silkworm Bombyx mori L. (PM x NB4D2) under different photoperiodic combinations. Proc. Indian Acad. Sei. (Anim. Sei.) 99, 327–334.CrossRefGoogle Scholar
  19. Sivarami Reddy N., Pavan Kumar T. and Sasira Babu K. (1990) Moulting patterns in the silkworm Bombyx mori, L (PM x NB4D2) under different photoperiodic conditions. Proc. Indian Acad. Sei. (Anim. Sei.) 99, 467–475.CrossRefGoogle Scholar
  20. Truman J. W. (1972) Physiology of insect rhythms. I. Circadian organisation of the endocrine events underlying the moulting cycle of larval tobacco hornworms. J. exp. Biol. 54, 805–820.Google Scholar
  21. Truman J. W. and Taghert P. H. (1981) Hormonal control of pupal ecdysis in the tobacco homworm, Manduca sexta. In Current Topics in Insect Endocrinology and Nutrition (Edited by Bhaskaran G. and Rodriguez J. G.), pp. 171–181. Plenum Press, New York and London.CrossRefGoogle Scholar
  22. Winfree A. T. (1970) The temporal morphology of a biological clock. In Lectures in the Life Sciences (Edited by Gerstenhaber M.) pp. 111–150. American Mathematical Society, Providence, RI.Google Scholar
  23. Winfree A. T. (1972) Slow dark adaptation in Drosophila’s circadian clocks. J. comp. Physiol. 777, 418–434.CrossRefGoogle Scholar

Copyright information

© ICIPE 1993

Authors and Affiliations

  • N. Sivarami Reddy
    • 1
  • T. Pavan Kumar
    • 1
  • P. Murali Mohan
    • 1
  • K. Sasira Babu
    • 1
  1. 1.Department of ZoologySri Venkateswara UniversityTirupatiIndia

Personalised recommendations