抄録
Flower buds of sesame plant (Sesamum indicum L.) were internally subjected to β-rays from absorbed radiophosphorus (P32) by using three different methods, stem injection, radicle immersion and leaf immersion.
The applied radioactivity ranged from 0.005 to 1.5μc per ml. at the start of experiment.
The effects of β-rays emitted from P32 on living cells were measured by observations on the meiotic chromosome aberrations of the treated plants, and aberration frequency obtained proved to be proportional to dosage of β-rays.
Aberrations at MI, chromosome chains, rings and frying-pans were more frequently observed, and those at AI laggard chromosomes or acentric fragments were commonly seen throughout the treatment. Among β-ray effects were fragmentation, bridge, stickiness, formation of multipolar spindles and others.
Cells in tetrad stage, or pollen grains from treated plants exhibited many abnormalities in size, shape and number.
