Effects of X-irradiation on egg hatchability, larval and pupal survival in the tobacco hornworm, Manduca sexta |
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Authors: | M J Ely A M Jungreis |
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Affiliation: | Department of Zoology, University of Tennessee, Knoxville, Tennessee 37916, U.S.A. |
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Abstract: | The effects of X-irradiation upon Manduca sexta egg hatchability and larval survival were studied using LD50's. Radiosensitivity declined with age in developing eggs (LD50 of 9.4 kR in 2.5 to 3-days eggs contrasted to 18.2 kR in 4 to 4.5-day eggs) and in larvae. The dose-response patterns obtained agree with those previously reported for other insects.The maximal (ED0) and minimal (ED100) X-ray exposures resulting in eclosion successes of 100% and 0%, respectively, were utilized throughout pupal-adult development as measures of radiation sensitivity. A pronounced decrease in radiosensitivity was noted through the day of eclosion (Day 0: ED0 = 7.3 kR; ED100 = 18.7 kR; Day 22: ED0 = 45.0 kR, ED100 = 105.0 kR). X-irradiation during the pupal-adult transformation was observed to inhibit eclosion without disrupting normal metamorphosis. |
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