POSTIRRADIATIVE EFFECTS ON CHROMOSOMAL ABERRATIONS IN TRADESCANTIA MICROSPORES

Journal Article · Tue Mar 01 04:00:00 EST 1960 · Genetics (U.S.)

OSTI ID:4185061

Beatty, A V; Beatty, J W

The CO effect in relation to chromosomal aberration production in oxygen is operative on the recovery mechanism since immediate postirradiative treatment with CO yielded the same number of aberrations as irradiative treatment. As determined by the CO effect, all rejoining, as far as two-hit aberrations are concerned, was completed within ten minutes after irradiation. All experiments in which irradiation was done in air followed by am immediate postirraditive treatment in helium, showed a posttreatment effect by an aberration yield higher than was obtained with posttreatment in air. In all the experiments where helium was used followed by air a decrease in aberration yield was found. These data are interpreted as supportive evidence that the availability of energy for chromosome rejoining directly influences the two-hit aberration yield in such a way that postirradiative aerobic conditions favor restitution over exchanges while postirradiative anoxic conditions favor exchanges over restitution. The results from fractionation experiments indicate that some of the breaks produced in air or in helium when postirradiatively treated in air remain open and available for use in the production of two-hit aberrations for approximately 30 minutes, and that breaks postirradiatively treated in helium remain open for a longer period. (auth)

• Research Organization: Emory Univ., Atlanta
• NSA Number: NSA-14-015540
• OSTI ID: 4185061
• Journal Information: Genetics (U.S.), Journal Name: Genetics (U.S.) Vol. Vol: 45; ISSN GENTA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

AIR
BIOLOGY AND MEDICINE
CARBON MONOXIDE
CHROMOSOMES
GENETICS
HELIUM
IRRADIATION
MEIOSIS
MITOSIS
MUTATIONS
OXYGEN
PLANTS
QUANTITY RATIO
RADIATION EFFECTS
RECOVERY
SPORES
TESTING
TRADESCANTIA