The values represent the mean ± S.E. calculated on the basis of results of three replicate experiments.
In the same column, values with different subscripts are statistically significantly different from each other at P < 0.05 according to the Duncan's multiple range test. a Statistically significant difference at P < 0.05 from the value for 0 Gy. b Statistically significant differences at P < 0.05 from the values for 0, 400, and 500 Gy.