RADIOBIOLOGICAL STUDIES IN PLANTS. VI. EFFECTS OF RADIATIONS FROM THE NUCLEAR REACTOR, JRR-1, ON DRY SEEDS OF WHEATS AND OATS

Journal Article · Mon Jan 01 04:00:00 EST 1962 · Ikushugaku Zasshi (Japan)

DOI:https://doi.org/10.1270/jsbbs1951.12.237· OSTI ID:4089942

Nishiyama, I; Ichikawa, S; Maruyama, T

Dry seeds of Triticum monococcum, T. dicoccum, T. persicum, T. vulgare, Aegilops squarrosa, Avena strigosa, A. barbata, and A. sativa were irradiated in the beam of the Japan Research Reactor No. 1 (JRR-1). The radiations were mainly thermal neutrons, with contaminating resonance neutrons, fast neutrons, and gamma rays. Seed germination was not affected by a dose of 9.2 x 10/sup 11/n (th)/cm/sup 2/ or 1.8 x 10/sup 12/n(res)/cm/sup 2/, but was clearly disturbed by 9.2 x 10/sup 12/n(th)/cm/sup 2/, excepting hexaploid species. Seedling heights of diploid species were decreased distinctly by 1.8 x 10/sup 12/n(res)/cm/sup 2/ and extremely by 9.2 x 10/sup 12/n(th)/cm/sup 2/ doses, but tetra- and hexaploid species were more tolerant than diploids. Moreover, the experiments indicated that Avena is generally more resistant than Triticum. Both length and width of the first, second, and third leaf blades were reduced by certain dosages, the first leaf being most resistant and the third most sensitive. This suggests that leaves in different developmental stages show different responses to radiation. The LD/sub 50/ for thermal neutrons, x rays, and gamma rays were determined for each species. By comparison of the survival rate 100 days after sowing, a dose of about 2.1 x 10/sup 8/n(th)/cm/sup 2/ of thermal neutrons (plus other contaminating radiations) in JRR-1 was calculated to have the effect equivalent to 1 r of x or gamma rays. (BBB)

• Research Organization: Kyoto Univ.
• Sponsoring Organization: USDOE
• NSA Number: NSA-18-013494
• OSTI ID: 4089942
• Journal Information: Ikushugaku Zasshi (Japan), Journal Name: Ikushugaku Zasshi (Japan) Vol. Vol: 12; ISSN IKZAA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

BIOLOGY AND MEDICINE
CEREALS
CHROMOSOMES
FAST NEUTRONS
GAMMA RADIATION
GERMINATION
IRRADIATION
JRR-1
LEAVES
LETHAL DOSE
MUTATIONS
NEUTRON BEAMS
NUCLEAR MODELS
OATS
PLANTS
PLOIDY
QUANTITY RATIO
RADIATION DOSES
RADIATION EFFECTS
RADIOBIOLOGY
RESEARCH REACTORS
SEEDS
THERMAL NEUTRONS
TRITIUM
WHEAT