Chromosomal Studies on Radiation-Induced Gynogenesis and Diploid Gynogenesis in the Fish Oryzias latipes

When sperm of the fish Oryzias latipes exposed to radiation fertilize normal eggs, the 'Hertwig effect' occurs, namely a high mortality of embryos at low doses but a better survival at high doses. This phenomenon induced by ultraviolet light (UV) or gamma-rays was previously studied quanti...

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Published in:JOURNAL OF RADIATION RESEARCH 1983-01, Vol.24 (2), p.184-195
Main Author: Ijiri, K
Format: Article
Language:English
Subjects:
Animals
Chromosomes
Diploidy
Female
Fishes - embryology
Gamma Rays
In Vitro Techniques
Male
Spermatozoa - radiation effects
Ultraviolet Rays
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description When sperm of the fish Oryzias latipes exposed to radiation fertilize normal eggs, the 'Hertwig effect' occurs, namely a high mortality of embryos at low doses but a better survival at high doses. This phenomenon induced by ultraviolet light (UV) or gamma-rays was previously studied quantitatively using the survival frequencies of embryos at various stages during their development. From the genetic analysis of both UV and gamma-ray effects, using the wildtype sperm of this species and then checking the appearance of melanophores on the yolk sacs of embryos, it was suggested that sperm chromosomes do not participate in embryonic development at high doses. The number of chromosomes in cells of the embryos which survive till stage 26 were counted, finding haploid embryos in the dose region of the Hertwig phenomenon. The analysis of chromosome number was mostly in agreement with the genetic studies, but there existed a few cases in which these two methods of analysis did show the opposite results.
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source Oxford Journals Open Access Collection; J-STAGE Free - English
subjects Animals
Chromosomes
Diploidy
Female
Fishes - embryology
Gamma Rays
In Vitro Techniques
Male
Spermatozoa - radiation effects
Ultraviolet Rays
title Chromosomal Studies on Radiation-Induced Gynogenesis and Diploid Gynogenesis in the Fish Oryzias latipes
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