ULTRAVIOLET-X-RAY INTERACTION IN RELATION TO FREQUENCY AND TYPES OF CHROMOSOME ABERRATIONS AND MUTATIONS IN TRITICUM AESTIVUM L

Journal Article · Tue Oct 01 04:00:00 EDT 1963 · Indian J. Exptl. Biol.

OSTI ID:4623227

Nirula, S

The effects of subjecting dry seeds of bread wheat to combined and separate treatments of ultraviolet and x rays on the frequency of chromosome aberrations, and the rate and spectrum of mutations were studied. Somatic chromosome aberration frequency was found to increase with dose in x-ray treatments. Pre-treatment with ultraviolet promotes reunion and thereby increases the frequency of twobit aberrations and the total aberration rate. At meiosis in microsporocytes, a corresponding increase in translocation frequency is observed in ultraviolet pre-treated plants. The rate of viable morphological mutations increases with the x-ray dose. When pre-treated with ultraviolet, the mutation rate is reduced at 11000, 18500, and 33000 r of x rays but is enhanced at 22000 r. Mutations affecting ear characters constitute 92% of the total number of mutations isolated in ultraviolet pre-treated material, while this frequency is about 84% following x-ray treatment. Thus, in spite of its poor penetrating ability, it appears that ultraviolet irradiation can be effectively used for irradiating seeds of wheat, ihe caryopsis of which allows direct exposure of the embryo. (auth)

• Research Organization: Indian Agricultural Research Inst., New Delhi
• NSA Number: NSA-17-040588
• OSTI ID: 4623227
• Journal Information: Indian J. Exptl. Biol., Journal Name: Indian J. Exptl. Biol. Vol. Vol: 1
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

BIOLOGY AND MEDICINE
CEREALS
CHROMOSOMES
HUMIDITY
IRRADIATION
MALFORMATIONS
MEIOSIS
MITOSIS
MUTATIONS
PLANT CELLS
PLANTS
RADIATION DOSES
RADIATION EFFECTS
RADIATION INJURIES
SEEDS
ULTRAVIOLET RADIATION
X RADIATION