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Photoperiodic implications on the pupal ecdysis in the silkworm, Bombyx Mori L. (PM × NB4D2)

Published online by Cambridge University Press:  19 September 2011

N. Sivarami Reddy ,
T. Pavan Kumar ,
P. Murali Mohan  and
K. Sasira Babu
N. Sivarami Reddy
Affiliation:
Department of Zoology, Sri Venkateswara University, Tirupati 517 502, India
T. Pavan Kumar
Affiliation:
Department of Zoology, Sri Venkateswara University, Tirupati 517 502, India
P. Murali Mohan
Affiliation:
Department of Zoology, Sri Venkateswara University, Tirupati 517 502, India
K. Sasira Babu
Affiliation:
Department of Zoology, Sri Venkateswara University, Tirupati 517 502, India
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Abstract

Pupation patterns, viz. larval ripening, pharate pupal and pupal formation were diurnally predominant in the silkworm, Bombyx mori L. (PM × 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.

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 predominant pendant le jour, en cas du vers à sole, Bombyx mori. Sous l'lllumination continue, le rythme s'est aplati. Quand les données expérimentales ont été soumis à une traitement statistique circulaire, les pics se sont manifested comme deux modes distincts, c'est-à-dire, les groupes resultantes 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.

Keywords

Photoperiodpupal ecdysisBombyx mori
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 14 , Issue 1 , February 1993 , pp. 21 - 29
Copyright
Copyright © ICIPE 1993

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