RADIATION GENETICS IN WHEAT. VIII. THE RBE OF HEAVY PARTICLES FROM B$sup 10$ (N,$alpha$) Li$sup 7$ REACTION FOR CYTOGENETIC EFFECTS IN EINKORN WHEAT

Journal Article · Tue Jan 01 00:00:00 EST 1963 · Radiation Botany

DOI:https://doi.org/10.1016/0033-7560(63)90005-X· OSTI ID:4712590

Matsumura, S; Kondo, S; Mabuchi, T

The relative biological effectiveness (RBE) of alpha plus Li/sup 7/ recoil particles relative to gamma-rays has been studied for seedling height depression, chromosome aberrations, and chlorophyll mutations in Einkorn wheat. Irradiation with these heavy particles was administered by using the reaction of B/sup 10/ (n, alpha ) Li/sup 7/; wheat seeds, which had been previously soaked in aqueous solution at different borax concentrations (0 to 1.0 per cent), were exposed to thermal neutrons in a reactor. Subtracting the radiobiological effects of thermal neutrons for seeds soaked in pure water from those found for seeds soaked in borax solution, the net effects of the heavy particles were estimated and compared with the gamma-ray effects for seeds under the same soaking conditions as for neutron treatments. The RBE values obtained for chromosome aberrations in pollen mother cells and for chlorophyll mutations were 23 450 deg C in a 10 and 29 450 deg C in a 10, respectively. These figures are of the same order as those for fast neutrons previously reported for wheat and barley. Most of the present results are explicable on the assumption that chromosome breakage in wheat requires many ionizations to occur within a chromosome and that the majority of radiation-induced chlorophyll mutations result not from point mutations but from chromosome breakage events. (auth)

• Research Organization: National Inst. of Genetics, Misima, Japan
• NSA Number: NSA-17-023144
• OSTI ID: 4712590
• Journal Information: Radiation Botany, Vol. Vol: 3; Other Information: Orig. Receipt Date: 31-DEC-63
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

BIOLOGY AND MEDICINE
ALPHA PARTICLES
BARLEY
BORATES
BORAX
BORON 10
CEREALS
CHLOROPHYLL
CHROMOSOMES
CYTOLOGY
EFFICIENCY
ELEMENTARY PARTICLES
FAST NEUTRONS
GAMMA RADIATION
GENETICS
GROWTH
IONIZATION
JAPAN
LITHIUM 7
MUTATIONS
NEUTRONS
POLLEN
QUANTITY RATIO
RADIATION DOSES
RADIATION EFFECTS
RADIATION INJURIES
RADIOBIOLOGY
RBE
REACTORS
RECOILS
SEEDS
SODIUM COMPOUNDS
SOLUTIONS
THERMAL NEUTRONS
VARIATIONS
WATER
WHEAT