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Effects of gamma-radiation on mature pupae of maize borer, Chilo partellus (Swinhoe) (Lepidoptera: Pyralidae)*

Published online by Cambridge University Press:  19 September 2011

A. R. Bughio
A. R. Bughio
Affiliation:
Atomic Energy Agricultural Research Centre, Tandojam-70060, Sindh, Pakistan
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Abstract

Mature (5- to 6-day-old) male and female pupae of C. partellus were irradiated at 5 to 20 kilo-Roentgen (kR) and 5 to 10 kR respectively. Emergence of normal appearing moths, pupal periods and adult longevities remained statistically unaffected. Fecundity of normal (nonirradiated) females mated with males irradiated as pupae was nonsignificantly different from control, but fecundity of females irradiated as pupae at 10 kR was significantly reduced when they were mated with normal mates. Dominant lethals of varying intensities were induced at 5–20 kR. However, induction of dominant lethality was sex- as well as dose-dependent. Radiation doses inducing 100% dominant lethals in sperm (20 kR) and ova (5 kR) did not mitigate the mating ability of males and receptivity of females. However, receptivity of females was reduced significantly when they were irradiated as pupae at 10 kR. Rates of embryonation in F1 eggs were significantly reduced when normal females were crossed with males irradiated as pupae at 20 kR, but similar effect was observed at 10 kR in reversed crosses. Embryonic development was delayed in eggs obtained from crosses, where male or female parent was irradiated in pupal stage, but in both cases most of the dominant lethals acted late in embryonic development.

Résumé

Les pupes mâle et femelles âe;gées (5 à 6 jours) de C. partellus ont été irradiées à 5–20 kR et 5–10 kR respectivement. L'irradiation n'effecté pas les éclosions, la survie des pupes et la longevité des adultes. La fécondité des femelles normales accouplés aux des mâles irradiées ne diffère pas significativement du témoln mais les féconditées des femelles irradiées à 10 kR et accouplés avec des mâles non irradiées ont réduites en fonction de la dose. L'induction de létalité dominante a dépendés sur les sex et la dose. Les doses de rayonnements nécessaires pour 100% létalité dominante en des sperms (20 kR) et des oeufs (5 kR) n'effectuées pas des comportement sexuel chez des mâles et des femelles. Les pupes irradiées à la dose de 10 kR a provoqué l'accouplement des femelles. L'embryon des oeufs F1 été rédultes significativement quand la femelles normale été crolssées avec le mâle irradié à la dose de 20 kR a stade de la pupe mais les effets semblable été observées à la dose de 10 kR quand les femelles irradiées été croisées avec des mâles normales. Les développement des embryons sont retardés dans des oeufs obtenir en accouplements des mâles ou des femelles irradiées à la stade de pupes mais en cheque les deux cases létalité dominante devient plus tard.

Keywords

Maize borerChilo partellusgamma-radiationpupaeembryonic developmentdominant lethalityChilo partellusrayonnement gammapupesdéveloppement des embryonslétalité dominante
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 13 , Issue 3 , June 1992 , pp. 363 - 368
Copyright
Copyright © ICIPE 1992

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