CYTOLOGICAL AND GENETIC CHANGES INDUCED BY X-RAYS AND THERMAL NEUTRONS IN RICE

Journal Article · Thu Jun 01 04:00:00 EDT 1961 · Botan. Bull. Acad. Sinica

OSTI ID:4756587

Chao, C; Chai, S

Dry seeds of two rice varieties were treated with both x rays and thermal neutrons in two doses each. Comparisons of the effects were made between the two types of irradiations as well as between the two varieties as measured by seedling height, number of seedlings survived, chromosonral interchanges, pollen abortion, and seedling mutations. Seeds of both varieties treated with thermal neutrons were much more uniformly affected than x irradiated seeds as shown by the seedling height and number of seedlings survived. Intervarietal differences in response to both irradiations were observed. Seeds of the variety Taichung No. 65 after being irradiated with x rays and thermal neutrons produced more chromosomal interchanges than that of the variety Chianan No. 8. The reverse was the case for the seedling mutations. It was calculated from the data for chromosomal interchanges that 1 r of x rays was approximately equal to 1.4 x 10/ sup 9/ nth/cm/sup 2/ of thermal neutrons. The relationship between the per cent of chromosomal interchanges and the per cent of pollen abortion was rather obscure. In testing the segregating ratio of the variegated type of chlorophyll deficient mutants, it was observed that temperature had an important effect on the expression of such mutants in the segregating populations. (auth)

• Research Organization: National Taiwan Univ., China
• NSA Number: NSA-16-032763
• OSTI ID: 4756587
• Journal Information: Botan. Bull. Acad. Sinica, Journal Name: Botan. Bull. Acad. Sinica Vol. Vol: 2
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

BIOLOGY AND MEDICINE
CEREALS
CHLOROPHYLL
CHROMOSOMES
IRRADIATION
MEASURED VALUES
MUTATIONS
RADIATION DOSES
RADIATION EFFECTS
RICE
SEEDS
TEMPERATURE
THERMAL NEUTRONS
X RADIATION