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Gamma irradiation effects on mating competitiveness of Tribolium castaneum (Herbst)

Published online by Cambridge University Press:  19 September 2011

Kamelia Aly Abdel-Salam
Kamelia Aly Abdel-Salam
Affiliation:
Atomic Energy Authority, NRC, Radiobiology Department, Abo-Zaabal 13759, Egypt
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Abstract

When males of Tribolium castaneum (Herbst) substerilized with 35, 40 or 50 Gy of gamma irradiation (I) were added to untreated (U) pairs of adults at I : U ratios of 1:1, 2:1 and 5:1, the percentage of hatched eggs was increased by increasing the dose administered to males, as not expected, at equal flooding ratio. The calculated degree of competitiveness showed that males irradiated with the lowest dose (35Gy) were more competitive than males irradiated with the highest dose (50 Gy). However, increasing the ratio of irradiated males with 50 Gy to 10 or 20 increased, accordingly, the competitiveness value. The results also indicate that if an equal number of irradiated males and females with 50 Gy, which had given 99.16 % sterility, were placed with untreated pairs of adults at different ratios (1:1, 5:1, 10:1, and 20:1), the effectiveness was more promising. Moreover, the data further suggest that the effectiveness was enhanced when the ratio of irradiated males and females was increased. Thus, the presence of sterile females along with sterile males in the stored products appears to dilute the effectiveness of normal males, which otherwise would mate with normal females.

Résumé

Quand les mále de T. castaneum sterilisés avec 35,40 eu 50 Gy de radiation de gamma (I) sont ressemblés avec des paires d'adultes non traite's I : U, des mâles et de femèlles 1:1, 2:1 et 5:1, le pourcentage déclosion dóeufs est augemente avec l'augementation de la dose destiné aux males. It est observé que les mâles traités par la dose la plus faible (35 Gy) sont plus competitits que cenx traités par la dose la plus forte (50 Gy). Les resultats indiquent que le nombre égale des mailes et des femélles traités par 50 Gy (99.16% de sterilité) qui ont été placés avec des paires d'adultes non traités de different ratio (1:1, 5:1, 10:1 et 20:1), ne donnent pas d'éfficacité supplement aire. L'éfficacité peut etre induite par augementer le ratio des mále et des femélles irradiés. La présence dans les produits stockés des femélles steriles avec des mâles steriles dilue l'éfficacité des mâles normanx qui peuvent frequenter les femélles normales.

Keywords

Gamma radiationrust-red flour beetleTribolium castaneummating competitivenessstored product insects
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 10 , Issue 1 , February 1989 , pp. 35 - 42
Copyright
Copyright © ICIPE 1989

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