COMPARATIVE CYTOLOGICAL STUDIES ON A SUSCEPTIBLE AND RESISTANT STRAINS OF PINK BOLLWORM, PECTINOPHORA GOSSYPIELLA MUND.) | ||||
| Egyptian Journal of Agricultural Research | ||||
| Article 9, Volume 76, Issue 2, July 1998, Page 535-543 PDF (2.63 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejar.1998.347303 | ||||
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| Authors | ||||
| MONA F. ROFAIL; ABDEL-SALAM E. M. EL-SORADY; AMIRA M. RASHAD | ||||
| Plant Protection Research Institute, Agricultural Research Centre, Dokki, Giza, Egypt | ||||
| Abstract | ||||
| The parent strain of Pectinophora gossypiella (Saund.) was collected from cotton fields and reared in the laboratory for several generations free from insecticidal pressure. Selection of newly hatched larvae with cyanophos for 24 generations resulted in a 32.51-fold increase in resistance. Cytological behaviour of chromosomes in meiotically dividing cells was studied at the 24th selected generation. Also, the cytological aberration in relaxed strain for one generation was studied. Results show that the percentage of abnormal cells was 26.087 at the 24th selected generation. Relaxed strain showed a slight decrease of percentage of abonormalities (22%) as compared with the susceptible strain (2.8). The most frequent chromosomal aberrations were stickiness of chromosomes and lagging chromosomes. Irregular distribution of chromosomes was also observed in a few cells. | ||||
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