Abstract
Chromosome numbers were counted in the control material. New count was made i.e., 2n=42 in C. eragrostis.Study of the germination percentages and survival percentages of three mem-bers of Cyperaceae and one species of Luzula, show that there is only a slight difference between numbers germinating and numbers surviving. The opposite is true for plants with a localised centromere.Study of the survival percentages in the M1, M2 and M3 generations of the above four plants with diffuse centromeres, shows a general reduction in survival in M2 and only a very slight improvement, if not further reduction, in M3. By contrast, in plants with localised centromeres, there is nearly 100% survival in M2 at doses where seeds from the M1 plants are viable.Overall, the prossession of a diffuse centromere confers no advantage, following seed irradiation.
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