Comparison between Two Genera, Species and Cultivars in Lactuceae

IV. Effects of seed-irradiation on mitosis

抄録

The germination time under standard conditions was determined in control material of three cultivars of Lactuca sativa and L. serriola, and also the time of first nuclear division from dormancy, together with mitotic index at stated times from onset of mitosis. The effect of seed irradiation on the mitotic index and on the production of anaphase bridges at the same dose in the different cultivars or species was investigated. Results are presented as histograms and/or tables. The order of sensitivity to radiation of two of the cultivars of L. sativa and L. serriola, determined by growth inhibition studies, not presented, was as follows:
most resistant Tom Thumb
less resistant Cos }L. sativa
least resistant (most sensitive) L. serriola
More aberrations were produced at the same dose in the sensitive species. The results are discussed.