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An investigation using the F, hybrid seeds of three cross combinations, Nicola × 80NF-3 (N × 8), Weima × D6-1-a (W × D) and Irish Cobbler × I (I.C. × I) was performed upon the effectiveness of daylength and temperature treatments on the tuberization and stolon formation in the seedlings of true potato seeds along with changes in chlorophyll and sugar contents. Seedlings were grown in growth chambers under the controlled daylength (short day, 8hr light and long day, 16hr light) and temperature (high temp.; day-night, 25∼25℃ and altering temp.; day-night, 25∼15℃). The percentage of tuberization was increased in the altering temperature plots of long day or short day treatment except W × D. Long day and high temperature plots (16hr light, 25℃) did not show tuberization regardless of cross combinations. The highest percentage of tuberization was shown with I.C. × I. The stolon was formed in high rates in all plots, but it was not accordant with the tuberization. There was no correlation between the tuberization and the chlorophyll or the sugar content in senescent leaves. The root weight was heavier in the plots of long days-high temperature.
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