ULTRAVIOLET AND X-RAY INDUCED CHROMOSOMAL ABERRATIONS IN WHEAT

Journal Article · Sun Sep 01 04:00:00 EDT 1957 · Genetics (U.S.)

OSTI ID:4344675

Steintz-Sears, L M; Sears, E R

From wheat pollen given dosages of ultraviolet and x rays roughly comparable in capacity to break chronmosomes, 56 and 124 plants, respectively, were obtained, all of which were analyzed cytologically. Reciprocal translocations and part- and whole-chromosome deiicieneies were found following both types of treatment, but more of the ultraviolet translocations were deficient for an apparently terminal segment. This is regarded as evidence for less reunion and more healing of broken chromosomes following ultraviolet treatment. The virtual absence of translocations in previous ultraviolet experiments is attributed to the strong tendency of ultraviolet-induced transloeations to involve deficiency. In diploid species these deficiencies would frequently cause inviability. The data suggest also that dicentric chromosomes are seldom lost in this nmaterial, but instead often break and give rise to chromosomes with terminal deficiencies. (auth)

• Research Organization: Univ. of Missouri, Columbia
• NSA Number: NSA-12-002656
• OSTI ID: 4344675
• Journal Information: Genetics (U.S.), Journal Name: Genetics (U.S.) Vol. Vol: 42; ISSN GENTA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

BIOLOGY AND MEDICINE
CEREALS
CHROMOSOMES
CYTOLOGY
MUTATIONS
POLLEN
ULTRAVIOLET RADIATION
WHEAT
X RADIATION