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Inherited sterility in different strains of Ephestia cautella (Lepidoptera: Pyralidae)

Published online by Cambridge University Press:  19 September 2011

Ayad A. Al-Taweel ,
Mohammed S.H. Ahmed ,
Sarab S. Kadhum ,
Asaad A. Hameed  and
Majdolin J. Nasser
Ayad A. Al-Taweel
Affiliation:
Agriculture and Biology Faculty, P. O. Box 765, Baghdad, Iraq
Mohammed S.H. Ahmed
Affiliation:
Agriculture and Biology Faculty, P. O. Box 765, Baghdad, Iraq
Sarab S. Kadhum
Affiliation:
Agriculture and Biology Faculty, P. O. Box 765, Baghdad, Iraq
Asaad A. Hameed
Affiliation:
Agriculture and Biology Faculty, P. O. Box 765, Baghdad, Iraq
Majdolin J. Nasser
Affiliation:
Agriculture and Biology Faculty, P. O. Box 765, Baghdad, Iraq
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Abstract

Partial sterility induced by gamma irradiation of Ephestia cautella adult males was studied in five laboratory strains (A,B,C,D and E) which exhibit conspicuous genetic variation in the adult forewing pigmentation. Four of these strains had been reared in the laboratory for more than 80 generations, while the fifth strain has been reared for only 10 generations. When males irradiated with 0.2 kGy were crossed with untreated females, the per cent egg hatch was reduced significantly as compared to the unirradiated control crosses. Strain C showed the highest reduction in the per cent egg hatch followed by a gradual decrease in radiation sensitivity in strains A,E,D and B, respectively. Fecundity and mating frequency appeared not to be affected but the sex ratios were clearly distorted (about two males to one female) in all strains. F1 progeny of all strains were either sterile when mated together (per cent egg hatch = 0.0%), but semi sterile when F1 males were mated to normal females (per cent egg hatch = 0.03–3.95 %). Low fertility was observed when F1 females were mated with normal males (per cent egg hatch = 1.30–15.04%). The cytogenetical investigations showed spermatogenesis to proceed normally in the F1 males, whose fathers had been irradiated (0.2 kGy). However, the primary spermatocyte cells carried multiple chromosomal translocations which were the main cause of the sterility in the F1 males.

Résumé

La stérilité partielle a été provoqueé par l'irradiation de gamma chez les cing mâles adultes de Ephestia cautella souches de laboratoire (nommées A,B,C,D, et E). Les adults deces souches exposent une visible pigmentation sur l'aile antérieure commeune variation génétique. Les quatre premeiére souches ont été élevees dans le laboratoire plusque 80 génération, tandisque la cinquieme jusquá 10 génération. Léclosion des aeufs ont été diminuees significativement qundune femelle normal croisée avec un mâle irradié de 0.2 kGy de rayons gamma en comporaison avec celles non-irradiee. On a constaté que l'effet d'irradiation sur léclosion des oeufs de souche C soit plusque lesautres, mals l'effet a diminue progressivement sur les A, E, D, et B, la proportion de sex ontété dénaturee (2 mâle: 1 femelle) chertoutes les souches apres lirradiation, mais la frequence deléclosion et l'union restaient presque normal. D'autre côté la stérilité était total chez les F1 de toutes souches quand on se croisé entre aux, et entre 0.0–3.95% quand une femelle normal croisee avec une F1 male irradié. On observé ainssi, une faiblé fertilité quand les deux F1 normal sáccoupler (eclosion de 1.3 á 15.04%).

Finalement, notre etudent cytogénétiques ont montrees quele déroulement dela spermatogenésé etait normal chez les mâles des F1 provenant de souches irradiees, male leur cellule spermatocyte apportent une translocation multiple celle aberration chromosomique aète trés prolalement la cause principle dela stérilité chez les males eu F1.

Keywords

Inherited sterilityF1-sterilityEphestia cautellastored product pestgamma radiation
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 10 , Issue 4 , August 1989 , pp. 463 - 469
Copyright
Copyright © ICIPE 1989

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