RADIOSENSITIVITY IN DIFFERENT STAGES OF SPERMATOGENESIS IN DROSOPHILA MELANO-GASTER

Journal Article · Mon Jan 01 04:00:00 EST 1962 · Hereditas (Sweden)

OSTI ID:4738314

Kvelland, I

The male flies of various ages were irradiated with 1150- to 3300-r doses of Co/sup 60/ gamma radiation to elucidate the relative radiosensitivity in different stages of spermatogenesis. This was evaluated by studying the sensitivity pattern for different kinds of mutations, such as visibles, sex- linked lethals, II-III translocations, and induced crossovers in males. A peak in the frequency of recessive sex-linked lethals was observed on day 5 after irradiation, while translocation frequency showed a peak on day 7. The frequency of visibles showed no peak, but the statistical calculation suggested an increase in frequency up to day 5. A period of excessive sterility was observed on days 7 and 8 or days 8 and 9 after irradiation. The first crossovers were observed on day 6 or 7, concurrently with a low fertility but prior to the minimum of fertility. The time required for spermiogenesis should be about 6 to 7 days at 25 deg C in adult males. It was found that the radiosensitivity of fully mature sperms (day 1) was somewhat higher than that of nearly mature sperms (day 2). With further immaturity an increasing sensitivity was obseived for all effects studied up to day 5 or 6. However, if sterility is used as a measure of radiation effect, the maximum occurs on days 8 and 9. (TCO)

• Research Organization: Norwegian Radium Hospital, Oslo
• NSA Number: NSA-17-017841
• OSTI ID: 4738314
• Journal Information: Hereditas (Sweden), Journal Name: Hereditas (Sweden) Vol. Vol: 48; ISSN HEREA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

AGE
ANIMAL CELLS
BIOLOGY AND MEDICINE
COBALT 60
DROSOPHILA
GAMMA RADIATION
GONADS
INSECTS
METABOLISM
MUTATIONS
QUANTITY RATIO
RADIATION DOSES
RADIATION EFFECTS
RADIOSENSITIVITY
REPRODUCTION