caa a22 4500 38637533X CHVBK 20180307112016.0 cr unu---uuuuu 161130e198908 xx s 000 0 eng 10.1017/S1742758400021470 doi S1742758400021470 pii (NATIONALLICENCE)cambridge-10.1017/S1742758400021470 Inherited sterility in different strains of Ephestia cautella (Lepidoptera: Pyralidae) [Elektronische Daten] 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. Copyright © ICIPE 1989 Inherited sterility nationallicence F1-sterility nationallicence Ephestia cautella nationallicence stored product pest nationallicence gamma radiation nationallicence Al-Taweel Ayad A. Agriculture and Biology Faculty, P. O. Box 765, Baghdad, Iraq Ahmed Mohammed S.H. Agriculture and Biology Faculty, P. O. Box 765, Baghdad, Iraq Kadhum Sarab S. Agriculture and Biology Faculty, P. O. Box 765, Baghdad, Iraq Hameed Asaad A. Agriculture and Biology Faculty, P. O. Box 765, Baghdad, Iraq Nasser Majdolin J. Agriculture and Biology Faculty, P. O. Box 765, Baghdad, Iraq International Journal of Tropical Insect Science Cambridge University Press 10/4(1989-08), 463-469 1742-7584 10:4<463 1989 10 JTI https://doi.org/10.1017/S1742758400021470 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S1742758400021470 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Al-Taweel Ayad A. Agriculture and Biology Faculty, P. O. Box 765, Baghdad, Iraq NATIONALLICENCE 700 1- Ahmed Mohammed S.H. Agriculture and Biology Faculty, P. O. Box 765, Baghdad, Iraq NATIONALLICENCE 700 1- Kadhum Sarab S. Agriculture and Biology Faculty, P. O. Box 765, Baghdad, Iraq NATIONALLICENCE 700 1- Hameed Asaad A. Agriculture and Biology Faculty, P. O. Box 765, Baghdad, Iraq NATIONALLICENCE 700 1- Nasser Majdolin J. Agriculture and Biology Faculty, P. O. Box 765, Baghdad, Iraq NATIONALLICENCE 773 0- International Journal of Tropical Insect Science Cambridge University Press 10/4(1989-08), 463-469 1742-7584 10:4<463 1989 10 JTI CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge