FIRST RESEARCH ON THE DOMINANT LETHALS INDUCED WITH X-RAYS ON THE MALES OF LOCUSTA MIGRATORIA MIGRATORIOIDES R. AND F. (ORTHOPTERA) (in Italian)
Journal Article
·
· Ricerca sci.
OSTI ID:4207068
Males of Locusta migratoria migratorioides R. and F. at 4th instar, just after the last moult and a month after the last moult were irradiated with x rays from 50 to 1600 roentgens. The irradiated males were mated to nonirradiated virgin females and the offspring was scored for embryo mortality. In this way dominant lethals induced in spermatogonia, spermatocytes and sperms were studied, The relation dosage-effects, for lominani lethals induced on sperms, follows a one-event curve; but it is possible that doses high enough to produce multi-event effects were not used. The sex ratio was observed to be altered in favor of males. The frequencies of dominant lethals increase when more mature germ cells are irradiated. This result is explained as cell selection againstgerm cells irradiated in premeiotic and meiotic stages. This view is supported by severai experiments on chromosomes and cell damages by x rays on Orthoptera. The percentages of embryos death at different stages of development were determined. When sperms were irradiated there was a higher mortility during segmentation, whereas when spermatogonia were irradiated mortality was higher in later stages of the embrvonic development. This result is considered to be further evidence of cell selection against germ cells irradiated during premeiotic stages. (auth)
- Research Organization:
- Universita of Padua
- NSA Number:
- NSA-14-004252
- OSTI ID:
- 4207068
- Journal Information:
- Ricerca sci., Journal Name: Ricerca sci. Vol. Vol: 29
- Country of Publication:
- Country unknown/Code not available
- Language:
- Italian
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