MITOTIC CYCLES IN ROOT TIP CELLS OF TWO SPECIES OF TRILLIUM (LILIACEAE)

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Abstract
There is a fourfold difference in the reported lengths of the mitotic cycles in Trillium. One report (29 hours at 23 °C for T. erectum) was based on the colchicine tag method, whereas the other (120 hours at 25 °C for T. grandiflorum) was based on the autoradiographic technique. In the present study both methods were used on both species. Experiments, carried out at 20 °C, gave minimum estimates of 104 hours and 84 hours respectively for T. grandiflorum and T. erectum, as determined by the colchicine method, and 92 hours and 80 hours by autoradiography. Both methods gave evidence of the existence of two or more populations of cells with different mitotic cycle times.