Cytology of Oögenesis in Chemosterilized Screw-Worm Flies, Cochliomyia hominivorax,1 as Related to Endomitosis in Nurse Cells2

Lachance, Leo E.; Leverich, Ann P.

doi:10.1093/aesa/61.5.1188

Cited by 10 publications

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“…From this we infer that the real synthetic activity in the NCN occurs after the disintegration and disappearance of polytene chromosomes, as evidenced by the continuous increase in the size of the NCN until stage 10. However, the disintegration of polytene chromosomes that occurred in E. sorbillans has no effect on the synthetic activity of nurse cells, as has been recorded in other insects by King et al (1956), Bier (1957), Jacob & Sirlin (1959), LaChance & Crystal (1963b), Goodman et al (1968), LaChance & Leverich (1968), Cummings & King (1969), Beattie & Cheney (1979), and Trepte (1979).…”

Section: Discussionmentioning

confidence: 53%

Cytological Changes during Oogenesis in Exorista sorbillans (Diptera: Tachinidae)

Puttaraju

Manjunatha

1994

Annals of the Entomological Society of America

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The cytological changes and growth rate of nurse cell nuclei, the oocyte nucleus, and the egg chamber during 14 stages of egg development in E. sorbillans Wiedemann are described. Stages 1-3 are mitotically active, resulting in the formation of one oocyte and 15 nurse cells. The visible nonbanded polytene chromosomes are formed at stage 3 in 32n nuclei of smaller nurse cells and 64n nuclei of larger nurse cells. The larger nurse cell nuclei attain a maximal ploidy of 1024n at stage 10. Soon after disintegration of the polytene chromosomes, the nurse cells at stage 6 synthesize the nuclear proteins and transfer them to the developing oocyte, which grows rapidly from stages 11 to 13. At stages 13 and 14, the nurse cells disintegrate and the oocyte matures with chorion, aeropyles, operculum, micropyle, and hatching pleat. At the end of stage 14, the matured oocyte has enlarged to 137,651.92 times that of the oogonium. The results are compared with those from allied species.

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Section: Discussionmentioning

confidence: 53%

Cytological Changes during Oogenesis in Exorista sorbillans (Diptera: Tachinidae)

Puttaraju

Manjunatha

1994

Annals of the Entomological Society of America

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Effect of Different Concentrations of Thiourea on the Longevity, Fecundity, and Egg Hatchability of the Beetle, Epilachna dodecastigma (Muls.)

Shanker

Kumar

Pandey

et al. 1990

Zoosystematics & Evolution

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The present paper elucidates that 0.005 to 0.05 per cent of thiourea has no significant effect on the longevity of Epilachna dodecastigma. However, when the concentration was raised from 0.05 to 0.10 per cent (t = 7.72, P < 0.001) and from 0.10 to 0.20 per cent (t = 1.90, P < 0.20), the longevity of the beetles was significantly reduced. Further, it has also been observed that as the concentration of thiourea increases, the number of eggs laid by the beetle decreases and complete sterility was achieved when 0.05 per cent of thiourea was applied. Therefore, 0.05 per cent of thiourea concentration is the most suitable dose for the sterilization of E. dodecastigma.

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Effect of Different Concentrations of Thiourea on the Longevity, Fecundity, and Egg Hatchability of the Beetle,Epilachna dodecastigma (Muls.)

Shanker¹,

Kumar²,

Pandey³

et al. 1990

Mitt. Mus. Nat.kd. Berl., Zool. Reihe

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The present paper elucidates that 0.005 to 0.05 per cent of thiourea has no significant effect on the longevity of Epilachna dodecastigma. However, when the concentration was raised from 0.05 to 0.10 per cent (t = 7.72. P < o.001) and from 0 . 1 0 to 0.20 per cent (t = 1.90, P < o.zo), the longevity of the beetles was significantly reduced. Further, it has also been observed that as the concentration of thiourea increases, the number of eggs laid by the beetle decreases and complete sterility was achieved when 0.05 per cent of thiourea was applied. Therefore, 0.05 per cent of thiourea concentration is the most suitable dose for the sterilization of E. dodecastigma.

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Cytology of Oögenesis in Chemosterilized Screw-Worm Flies, Cochliomyia hominivorax,1 as Related to Endomitosis in Nurse Cells2

Cited by 10 publications

References 0 publications

Cytological Changes during Oogenesis in Exorista sorbillans (Diptera: Tachinidae)

Cytological Changes during Oogenesis in Exorista sorbillans (Diptera: Tachinidae)

Effect of Different Concentrations of Thiourea on the Longevity, Fecundity, and Egg Hatchability of the Beetle, Epilachna dodecastigma (Muls.)

Effect of Different Concentrations of Thiourea on the Longevity, Fecundity, and Egg Hatchability of the Beetle,Epilachna dodecastigma (Muls.)

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