CYTOLOGIA
Online ISSN : 1348-7019
Print ISSN : 0011-4545
Comparative Sensitivity of Plant Root Meristems to Acute Gamma Irradiation According to Stationary Phase Cell Distribution and DNA Content
Thomas L. Rost
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1982 年 47 巻 3-4 号 p. 743-757

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An investigation is reported which was designed to determine if radiosensitivity of the G1-S and G2-M transitions of root meristem cells of Glycine max, Helianthus annuus, Pisum sativum and Vicia faba, is correlated with the number of cells in G1 and G2 in the stationary phase after 72 hrs of sucrose starvation or with their cellular DNA content. Stationary phase roots were irradiated with 137Cs gamma radiation at doses from 100R to 1000R and were compared on the basis of delay of entry into S and M, rate of S progression, total number of cells in S and M, and transition from G1 to M and G2 to M. 1) All species indicated a decrease in total cycling cells with increasing dose and a species correlation between the number of cells in G1 and G2 and radiosensitivity. 2) Most responses indicated the following order of radiosensitivity (least sensitive first)-H. annuus, G. max, P. sativum and V. faba. The sequence correlates best with stationary phase distribution and not with DNA amounts. 3) The relative sensitivity of each cycle phase was specific for each species. H. annuus, G. max and V. faba were equally sensitive in G1 and in G2. 4) An examination of irradiated G1 cells in each species indicated the absence of latent expression of damage for either G1-S or G2-M.
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© The Japan Mendel Society
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